Garmin GPS Receiver 178C User Manual

GPSMAP 178C

owner’s manual

Download from Www.Somanuals.com. All Manuals Search And Download.

Preface

Introduction

Congratulations on choosing one of the most advanced marine navigation systems available! The

Garmin GPSMAP 178C Sounder utilizes the proven performance of Garmin GPS and full-featured map-

ping to create an unsurpassed marine navigation chartplotter.

Preface/Registration/

Software License Agreement

To get the most out of your new navigation system, take the time to go through this owner’s manual

and learn the operating procedures for your unit. This manual is broken down into two parts for your

convenience.

Part One introduces you to the GPSMAP 178C Sounder and provides a Getting Started tour so that

you may become more familiar with the unit. This section provides you with a basic knowledge necessary

to use the unit.

Customer Service Product Registration

Part Two is divided into sections that provide detailed references to the advanced features and opera-

tions of the GPSMAP 178C Sounder. This allows you to concentrate on a speciﬁc topic quickly and look

up detailed information about the GPSMAP 178C Sounder.

Help us better support you by completing our

on-line registration today!

Have the serial number of your GPSMAP 178C handy

and connect to our web site (www.garmin.com). Look

for the Product Registration link on the Home page.

Also, be sure to record your serial number in the area

provided on page iv of this manual.

NOTE: If you have previously registered a Garmin

product purchase, we invite you to re-register using

our NEW on-line system. Many services provided by

our new product registration system are now being

automated and re-registering your purchase ensures

you the best possible support from Garmin.

Software License Agreement

BY USING THE GPSMAP 178C, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS

OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CARE-

FULLY.

Garmin grants you a limited license to use the software embedded in this device (the “Software”) in

binary executable form in the normal operation of the product. Title, ownership rights and intellectual

property rights in and to the Software remain in Garmin.

You acknowledge that the Software is the property of Garmin and is protected under the United

States of America copyright laws and international copyright treaties. You further acknowledge that the

structure, organization and code of the Software are valuable trade secrets of Garmin and that the Software

in source code form remains a valuable trade secret of Garmin. You agree not to decompile, disassemble,

modify, reverse assemble, reverse engineer or reduce to human readable form the Software or any part

thereof or create any derivative works based on the Software. You agree not to export or re-export the

Software to any country in violation of the export control laws of the United States of America.

Download from Www.Somanuals.com. All Manuals Search And Download.

Introduction

FCC Compliance

The GPSMAP 178C Sounder complies with Part 15 of the FCC interference limits for Class B digital

devices FOR HOME OR OFFICE USE. These limits are designed to provide more reasonable protection

against harmful interference in a residential installation, and are more stringent than “outdoor” require-

ments.

FCC Compliance

Operation of this device is subject to the following conditions: (1) This device may not cause harmful

interference, and (2) this device must accept any interference received, including interference that may

cause undesired operation.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in

accordance with the instructions, may cause harmful interference to radio communications. However,

there is no guarantee that interference will not occur in a particular installation. If this equipment does

cause harmful interference to radio or television reception, which can be determined by turning the

equipment off and on, the user is encouraged to try to correct the interference by one of the following

measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and the receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

• Consult the dealer or an experienced radio/TV technician for help.

The GPS 178C Sounder does not contain any user-serviceable parts. Repairs should only be made by

an authorized Garmin service center. Unauthorized repairs or modiﬁcations could result in permanent

damage to the equipment, and void your warranty and your authority to operate this device under Part

15 regulations.

Download from Www.Somanuals.com. All Manuals Search And Download.

The GPS system is operated by the United States government, which is solely responsible for its accuracy

and maintenance. The system is subject to changes which could affect the accuracy and performance of all

GPS equipment. Although the Garmin GPSMAP 178C is a precision electronic NAVigation AID (NAVAID),

any NAVAID can be misused or misinterpreted and, therefore, become unsafe.

Introduction

Warnings and Cautions

The electronic chart is an aid to navigation and is designed to facilitate the use of authorized government

charts, not replace them. Only ofﬁcial government charts and notices to mariners contain all information

needed for safe navigation – and, as always, the user is responsible for their prudent use.

Use the GPSMAP 178C at your own risk. To reduce the risk of unsafe operation, carefully review and

understand all aspects of this Owner’s Manual—and thoroughly practice operation using the simulator mode

prior to actual use. When in actual use, carefully compare indications from the GPSMAP 178C to all available

navigation sources, including the information from other NAVAIDs, visual sightings, charts, etc. For safety,

always resolve any discrepancies before continuing navigation.

CAUTION: IT IS THE USER’S RESPONSIBILITY TO USE THIS PRODUCT PRUDENTLY. THIS

PRODUCT IS INTENDED TO BE USED ONLY AS A NAVIGATIONAL AID AND MUST NOT BE USED

FOR ANY PURPOSE REQUIRING PRECISE MEASUREMENT OF DIRECTION, DISTANCE, LOCA-

TION, OR TOPOGRAPHY.

MAP DATA INFORMATION: One of the goals of Garmin is to provide customers with the most

complete and accurate cartography that is available to us at a reasonable cost. We use a combination of

governmental and private data sources, which we identify (as required) in product literature and copy-

right messages displayed to the consumer. Virtually all data sources contain inaccurate or incomplete

data to some degree. This is particularly true outside the United States, where complete and accurate

digital data is either not available or prohibitively expensive.

WARNING: This product, its packaging, and its components contain chemicals known to the State

of California to cause cancer, birth defects, or reproductive harm. This Notice is being provided in

accordance with California’s Proposition 65. If you have any questions or would like additional infor-

mation, please refer to our web site at http://www.garmin.com/prop65.

iii

Download from Www.Somanuals.com. All Manuals Search And Download.

LIMITED WARRANTY

Introduction

This Garmin product is warranted to be free from defects in materials or workmanship for one year from

the date of purchase. Within this period, Garmin will at its sole option, repair or replace any components

that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or

labor, provided that the customer shall be responsible for any transportation cost. This warranty does not

cover failures due to abuse, misuse, accident or unauthorized alteration or repairs.

Warranty and

Serial Number

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL

OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY ARISING

UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, STATU-

TORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY

FROM STATE TO STATE.

Serial Number

Use this area to record the serial number (8-digit number

located on the back of the unit) in case it is lost, stolen, or

needs service. Be sure to keep your original sales receipt in a

safe place or attach a photocopy inside the manual.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR

CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO

USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not allow the exclusion of

incidental or consequential damages, so the above limitations may not apply to you.

Serial Number:

Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the

purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY

FOR ANY BREACH OF WARRANTY.

To obtain warranty service, contact your local Garmin authorized dealer. Or call Garmin Customer Ser-

vice at one of the numbers shown below, for shipping instructions and an RMA tracking number. The unit

should be securely packed with the tracking number clearly written on the outside of the package. The unit

should then be sent, freight charges prepaid, to any Garmin warranty service station. A copy of the original

sales receipt is required as the proof of purchase for warranty repairs.

Products sold through online auctions are not eligible for rebates or other special offers from Garmin.

Online auction conﬁrmations are not accepted for warranty veriﬁcation. To obtain warranty service, an

original or copy of the sales receipt from the original retailer is required. Garmin will not replace missing

components from any package purchased through an online auction.

The Garmin GPSMAP 178C has no user-serviceable parts.

and is fastened shut with screws. Any attempt to open the

case to change or modify the unit in any way voids your

warranty and may result in permanent damage to the

equipment.

Garmin International, Inc.

1200 East 151st Street

Garmin (Europe) Ltd.

Unit 4, The Quadrangle, Abbey Park Industrial Estate

Romsey, SO51 9DL, U.K.

Olathe, Kansas 66062, U.S.A.

Phone:

913/397.8200

Phone:

FAX:

44/1794.519944

44/1794.519222

USA Only: 800/800.1020

FAX: 913/397.0836

Download from Www.Somanuals.com. All Manuals Search And Download.

Introduction

Designed for detailed electronic charting capability, the Garmin GPSMAP 178C Sounder is a pow-

erful navigation device that can give you the information you need:

Capabilities

Precision Performance

•

High-contrast, 256-color LCD screen with backlighting

12-channel parallel receiver tracks and uses up to 12 satellites for fast, accurate positioning

WAAS Capable — receive signals from the additional set of WAAS (Wide Area Augmentation

System) satellites to give you better accuracy

•

Differential-Ready — just add an optional Garmin beacon receiver for better than 5-meter accu-

racy

Fully gasketed, high-impact plastic alloy case, waterproof to IEC 529 IPX7

Advanced Navigating and Plotting

•

3000 alphanumeric waypoints with selectable icons and comments

Built-in Worldwide marine basemap to 20 miles includes detailed ocean, river and lake coast-

lines, cities, interstates, US state highways, and local thoroughfares

50 reversible routes with up to 50 waypoints each

Uploadable maps using Garmin’s MapSource™ PC products and BlueChart™ Data Cards

Coordinates: Lat/Lon, UTM/UPS, Loran TD, plus over 20 grids, including Maidenhead

TracBack route feature which allows you to quickly retrace your track log to a starting position

Built-in simulator mode

•

Built-in tide information from over 3,000 tide stations around the USA coastline, Alaska,

Hawaii, western Canada and several Caribbean Islands

Superior Fishﬁnding Ability

•

Whiteline feature provides a clear image of both bottom hardness and structure

See-Thru^®technology helps separate ﬁsh returns from thermoclines and structure

Multiple zoom levels with a moving view window

Underwater waypoint marking

Map/Sonar split screen combines navigation and ﬁshﬁnding information

Fish and depth alarms

Download from Www.Somanuals.com. All Manuals Search And Download.

Introduction

Before installing and getting started with your unit, please check to see that your package includes

the following items. If any parts are missing, please contact your Garmin dealer immediately.

Packing List

Standard Package:

•

GPSMAP 178C Sounder Unit

GA 29 Remote External Antenna and 30’ cable*

Internal Antenna**

Single-Knob Tilt & Swivel Bracket

Power/Data Cable

GPSMAP 178C Sounder

Standard and Optional Transducers

Owner’s Manual

Quick Reference Card

Unit part numbers 010-00340-00 and 010-00340-01

include a single-frequency 200kHz, plastic, depth and temp,

transom mount transducer.

Protective Cover

* Not included with part numbers 010-00340-01, 010-00340-03, or 010-003410-05 with internal antenna.

** Not included with part numbers 010-00340-00, 010-00340-02, or 010-003410-04 with remote antenna.

Unit part numbers 010-00340-02 and 010-00340-03

include a dual-frequency 200/50kHz,, plastic, depth and

temp, transom mount transducer.

Optional Accessories:

•

US A/C PC Adapter

Unit part numbers 010-00340-04 and 010-00340-05 do

not include a transducer.

EURO A/C PC Adapter

For a complete list of optional transducers, contact your

Garmin Dealer or Garmin direct.

Cigarette Lighter Adapter

BlueChart Marine Data Cards, MapSource CDs, USB Data Card Programmer and Data Cards

USB Data Card Programmer

For the most recent list of available accessories for

your GPS unit, current user manuals and software

updates, visit our web site at www.garmin.com.

GBR 21 Beacon Receiver for differential corrections

Transducers/Temperature Sensors/Water Speed Sensors/Extension Cables

Download from Www.Somanuals.com. All Manuals Search And Download.

Powering Off Unit . . . . . . . . . . . . . . . . . . . . .21

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i

Preface/Registration . . . . . . . . . . . . . . . . . . . . . i

Software License Agreement . . . . . . . . . . . . . . . i

FCC Compliance . . . . . . . . . . . . . . . . . . . . . . .ii

Warnings and Cautions . . . . . . . . . . . . . . . . . iii

Warranty and Serial Number . . . . . . . . . . . . . iv

Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . .v

Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . vi

Table of Contents . . . . . . . . . . . . . . . . . . . . . .vii

“How To” Index . . . . . . . . . . . . . . . . . . . . . . viii

Introduction

Section Two: Reference . . . . . . . . . . . . . . . . 22-91

Map Page . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Zooming . . . . . . . . . . . . . . . . . . . . . . . . . .24

Map Page Options . . . . . . . . . . . . . . . . . .25

Map/Sonar Split Page . . . . . . . . . . . . . . . . . . .32

Sonar Page . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Adjustment Menu . . . . . . . . . . . . . . . . . . .34

Sonar Page Options . . . . . . . . . . . . . . . . .36

Sonar Tab Options . . . . . . . . . . . . . . . . . .39

Compass Page . . . . . . . . . . . . . . . . . . . . . . . .41

Highway Page . . . . . . . . . . . . . . . . . . . . . . . . .42

Highway Page Options . . . . . . . . . . . . . . .43

Waypoints . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Creating . . . . . . . . . . . . . . . . . . . . . . . . . .44

Reviewing . . . . . . . . . . . . . . . . . . . . . . . . .48

Editing . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Going to a Destination . . . . . . . . . . . . . . . . . .53

TracBack Navigation . . . . . . . . . . . . . . . . . . . .54

MOB: Man OverBoard . . . . . . . . . . . . . . . . . .56

Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Creating . . . . . . . . . . . . . . . . . . . . . . . . . .57

Following . . . . . . . . . . . . . . . . . . . . . . . .58

List Page . . . . . . . . . . . . . . . . . . . . . . . . . .59

Review . . . . . . . . . . . . . . . . . . . . . . . . . . .60

Editing . . . . . . . . . . . . . . . . . . . . . . . . . . .61

Active Route Page . . . . . . . . . . . . . . . . . . . . . .64

Table of Contents

Find Key . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Find Options . . . . . . . . . . . . . . . . . . . . . .66

Main Menu Page . . . . . . . . . . . . . . . . . . . . . . .67

GPS Tab . . . . . . . . . . . . . . . . . . . . . . . . . .68

Tide Tab . . . . . . . . . . . . . . . . . . . . . . . . . .73

Trip Tab . . . . . . . . . . . . . . . . . . . . . . . . . .74

Celestial Tab . . . . . . . . . . . . . . . . . . . . . . .74

Track Tab . . . . . . . . . . . . . . . . . . . . . . . . .75

DSC Tab . . . . . . . . . . . . . . . . . . . . . . . . . .77

Card Tabs . . . . . . . . . . . . . . . . . . . . . . . . .82

Temp Tab . . . . . . . . . . . . . . . . . . . . . . . . .83

Setup Tab . . . . . . . . . . . . . . . . . . . . . . . . .83

Comm Tab . . . . . . . . . . . . . . . . . . . . . . . .86

Alarm Tab . . . . . . . . . . . . . . . . . . . . . . . . .90

Appendix A: Installation . . . . . . . . . . . . . . . .92

Appendix B: LORAN TD . . . . . . . . . . . . . . . .102

Appendix C: Map Datums . . . . . . . . . . . . . .104

Appendix D: Messages . . . . . . . . . . . . . . . .106

Appendix E: Navigation Terms . . . . . . . . . . .108

Appendix F: Time Offsets . . . . . . . . . . . . . . .110

Appendix G: Understanding Sonar . . . . . . .111

Appendix H: Speciﬁcations/Unit Care . . . . .116

Appendix I: Index . . . . . . . . . . . . . . . . . . . .118

Section One: Getting Started . . . . . . . . . . . . 1-21

Keypad Usage . . . . . . . . . . . . . . . . . . . . . . . . . .1

Selecting Options . . . . . . . . . . . . . . . . . . . . . . .2

Entering Data . . . . . . . . . . . . . . . . . . . . . . . . . .3

Initializing the Receiver/Power On . . . . . . . . . .4

Tour/Backlighting . . . . . . . . . . . . . . . . . . . . . . .6

Simulator Mode . . . . . . . . . . . . . . . . . . . . . . . .7

Main Pages/Map Page . . . . . . . . . . . . . . . . . . . .8

Map Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Marking Waypoints . . . . . . . . . . . . . . . . . . . .10

Using the NAV Key . . . . . . . . . . . . . . . . . . . . .11

Simulated Tour . . . . . . . . . . . . . . . . . . . . . . . .12

Reviewing/CreatingMap Waypoints . . . . .13

Map/Sonar Split Page . . . . . . . . . . . . . . . .14

Sonar Page . . . . . . . . . . . . . . . . . . . . . . . .14

Compass Page . . . . . . . . . . . . . . . . . . . . . .16

Highway Page . . . . . . . . . . . . . . . . . . . . . .17

Changing Data Fields/Active Route Page . .19

Main Menu Page/Deleting Waypoints . . . .20

vii

Download from Www.Somanuals.com. All Manuals Search And Download.

TO DO THIS:

SEE PAGE(S):

Introduction

Turn the unit on or off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Adjust screen backlighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Enter data and select options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Learn how to operate the unit’s function keys. . . . . . . . . . . . . . . . . . . . . . . . . 1

Mark your present location as a waypoint . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Go to a destination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Create and use a route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Pan using the map arrow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Zoom in or out on the Map page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Reconﬁgure the Map page display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Adjust Sonar settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Reconﬁgure the Sonar page display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Access the Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Change units of measure (statute, nautical, metric) . . . . . . . . . . . . . . . . . . . 85

Change the displayed time (zone) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

View tide information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

View celestial information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Set Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Use the Find function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

View a unit message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

“How To” Index

The list to the right is provided to help you quickly ﬁnd

some of the more important procedures you may use on

your new GPSMAP 178C.

viii

Download from Www.Somanuals.com. All Manuals Search And Download.

(ZOOM) OUT Key

The OUT key adjusts the map scale to display a larger area with less detail. (Zooms out)

Getting Started

Keypad Usage

OUT

(ZOOM) IN Key

The IN key adjusts the map scale to display a smaller area with more detail. (Zooms in)

PAGE Key

The PAGE key selects the main pages in sequence and returns display from a submenu page.

QUIT Key

The QUIT key returns the display to the previous page and, when entering data, it restores the previous value

(cancels data entry).

PAGE

ARROW KEYPAD

The ARROW KEYPAD is used to select (Highlight) menu options and enter data. It also controls cursor movement

on the Map Page.

QUIT

ENTER/MARK Key

The ENTER/MARK key selects a highlighted menu option. When entering data, it allows you to initiate entry, and

then to accept the selected value(s). It also marks the current location as a waypoint when pressed and held for

more than one second.

ENTER

MARK

MENU Key

Arrow Keypad

The MENU key displays a menu of available options for the current page. Press twice (or press and hold for more

than one second) to display the Main Menu.

NAV

NAV/ MOB Key

MOB

The NAV key displays the Go To and Follow navigation menu. MOB (Man OverBoard) actives the Man OverBoard

navigation feature when pressed and held for more than one second.

FIND

FIND Key

Power Key

The FIND key activates the ﬁnd function to search for nearby items and user waypoints.

Always press and release a key to perform its primary func-

tion. Press, hold for more than one second, then release the

ENTER/MARK , NAV/MOB, and MENU keys to activate

POWER/ BACKLIGHT Key

The POWER/ BACKLIGHT key turns on/off the unit and and adjusts the display illumination/contrast. Multiple

presses toggle the unit’s backlight between maximum, user-set, and minimum brightness levels.

their secondary function.

Download from Www.Somanuals.com. All Manuals Search And Download.

The GPSMAP 178C Sounder’s advanced keypad system is designed to allow for fast, convenient

selection of navigation options and data entry. The Getting Started Tour introduces you to the keypad

and provides a ‘hands-on’ lesson in using the GPSMAP 178C Sounder. We strongly encourage you

to follow the Getting Started tour before using your unit for actual navigation. The GPSMAP 178C

Sounder Quick Reference Guide contains helpful tips on using the unit and performing various naviga-

tion tasks.

Getting Started

Selecting Options

Selecting Options and Entering Data

You can select and activate options and enter data to customize the GPSMAP 178C Sounder to ﬁt

your requirements. You can use the ENTER/MARK key and ARROW KEYPAD to select options, enter

names and numbers in data ﬁelds, and activate your selections.

Options Menu with

highlighted option.

Use the ARROW

KEYPAD to highlight

the next option. Press

ENTER/MARK to

activate.

To select and activate an optional feature:

1. With any page displayed, press the MENU key to pop-up the options menu. The options menu dis-

plays a list of optional features which are speciﬁc for that particular page. To select any feature on

the list of options requires movement of the cursor, which is identiﬁed as “highlighting”, selecting

or choosing an item in a list or a ﬁeld (box) on a page.

2. Use the ARROW KEYPAD to move the cursor (highlight) up and down a list or up, down, and

sideways on menus.

3. Once you have moved to the desired selection, press the ENTER key to either activate the feature

or the MENU key to pop-up a sub-menu or list of yet more feature options. Repeat this process to

select an option from the list or press the QUIT key to return to the previous setting.

The QUIT key moves backwards through these steps or back to the main page you started on.

To select and activate a function button:

1. When moving about a page with function buttons, like the ‘New Map Waypoint’ page, you observe

functions such as ‘Delete’, ‘Show Map’ and ’OK’. To activate the function, highlight the desired

button and press the ENTER key.

Pop-up list of options for a highlighted ﬁeld.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Naming a waypoint or placing any sort of data that has not been predeﬁned requires the use of

both the ARROW KEYPAD and the ENTER/MARK key.

Entering Data

To enter a name or number in a data ﬁeld:

1. Once you have accessed a page with programmable data ﬁelds (e.g. ‘ Waypoint Edit’) you can use

the ARROW KEYPAD to move the cursor (Highlight) to ﬁelds on the page. Use the UP/DOWN

arrows to move up or down and the LEFT/RIGHT arrows to move sideways.

2. Pressing the ENTER key with the ﬁeld highlighted begins the process for entering data in the form

Pressing UP or DOWN

of alphanumeric characters.

on the ARROW KEYPAD

changes numbers and

letters.

3. Use the ARROW KEYPAD UP/DOWN arrows to cycle through numbers 0 to 9, plus/minus symbols,

blank space, and the alphabet. Pressing and releasing the keypad moves you character by character

through the list. Pressing and holding the keypad moves you rapidly through the list.

4. Use the ARROW KEYPAD LEFT/RIGHT arrows to move to the next character on the line or back-

wards to edit characters. If there are more than two lines of data, keep pressing to the RIGHT to

drop down to the next line.

Pressing LEFT or RIGHT

on the ARROW KEYPAD

moves the cursor along the

line or to the next line.

5. When data entry is completed press ENTER to accept data, then move to the next programmable

ﬁeld. Not all data ﬁelds are programmable, such as the date and time. When moving about a page

with these ﬁelds, the cursor skips over them.

Every ﬁeld and button on this page

can be programmed or activated.

The waypoint can be renamed.

A depth can be entered.

Data Entry Field

A waypoint symbol can be selected

from a list of symbols.

A water temperature can be

entered.

Non-programable

data ﬁelds

A comment can be added.

Option buttons can be activated.

The coordinates can be changed.

Download from Www.Somanuals.com. All Manuals Search And Download.

Initializing the Receiver

Getting Started

The ﬁrst time you power up your GPSMAP 178C Sounder, the receiver must be given an oppor-

tunity to collect satellite data and establish its present position. To ensure proper initialization, the

GPSMAP 178C Sounder is shipped from the factory in AutoLocate mode, which allows the receiver

to “ﬁnd itself” anywhere in the world. To speed up the initialization process, we recommend using the

graphic initialization process described on the next page, which usually provides a position ﬁx within a

few minutes.

Initializing the Receiver/

Power On

Before you initialize, make sure the GPSMAP 178C Sounder unit and antenna have been correctly

installed on your vessel according to the instructions in Appendix A. The antenna needs to be in a loca-

tion with a clear and unobstructed view of the sky to receive satellite signals.

To turn on the GPSMAP 178C Sounder:

1. Press and hold the POWER key until the power tone sounds and the display comes on, then release

the POWER key.

An Introduction page appears, asking you to read and acknowledge important information regard-

ing the proper use of the unit.

GPSMAP 178C Sounder Warning Screen

To acknowledge the introduction:

1. After reading the introduction page, press the ENTER/MARK key if you agree.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

To graphically initialize the GPSMAP 178C Sounder:

1. Press the MENU key twice for the Main Menu. Press Up or Down on the ARROW KEYPAD until the

‘GPS’ tab is highlighted, then press the MENU key once.

Initializing the Receiver

2. Using the ARROW KEYPAD, highlight ‘Initialize Position’ and press ENTER to initialize the receiver

from the map. The Initialize Position Page appears, prompting you to select your

approximate location with the map cursor.

3. Use the ARROW KEYPAD to move the map cursor and point to your approximate location within

200 miles. If you have difﬁculty identifying your position, press and release the IN key to see the

next lower map scale.

4. Once you have determined your approximate location on the map, press the ENTER key.

NOTE: This does not “calibrate” the unit in any way, but rather helps to speed up the

initial satellite acquisition. If the unit displays “Ready (2D) or (3D )” during this

process, it is not necessary to initialize the unit.

Point to your approximate loca-

tion and press ENTER/MARK.

The GPS Information Page appears as the receiver begins acquiring satellites for your region and

should acquire a ﬁx within a few minutes. When viewing the ‘GPS’ tab on the Main Menu, a signal

strength bar for each satellite in view appears on the bottom of the page, with the appropriate satellite

number under each bar. The progress of satellite acquisition is shown in three stages:

•

No signal strength bars— the receiver is looking for the satellites indicated.

Hollow signal strength bars— the receiver has found the indicated satellites and is collecting data.

Solid signal strength bars— the receiver has collected the necessary data and the satellites are

ready for use.

Once the receiver has collected information from at least three satellites, the top of the screen dis-

plays either “Ready (2D or 3D)”, and the GPSMAP 178C Sounder is ready for use.

A satellite’s strength bars turns

green when it’s ready for use.

Download from Www.Somanuals.com. All Manuals Search And Download.

GPSMAP 178C Sounder Getting Started Tour

Getting Started

The Garmin GPSMAP 178C Sounder is a powerful electronic navigation system that provides

detailed map coverage and convenient control of many advanced features right from the screen display.

This tour is designed to take you through the basic pages and functions of the system using the simula-

tor mode. Once you’re familiar with the main pages and functions of the unit, refer to the reference

section for instructions on performing speciﬁc tasks and functions.

Tour/Backlighting

The Getting Started Tour assumes that the receiver has been properly installed and initialized, and

you have not changed any of the default unit settings. If you have changed any settings (position

formats, units of measure, etc.), the descriptions and pictures in the tour may not match your

conﬁguration.

To turn the GPSMAP 178C on:

1. Press and hold the POWER key until the power tone sounds, then release the POWER key. The

Warning Page appears while the unit conducts a self-test.

A full-screen GPS Information pop-up page is displayed

after you press the ENTER key to acknowledge the

Warning Page. The pop-up page goes away after the unit

gets a position ﬁx or you press either ENTER or QUIT.

2. Once the self-test is complete, press the ENTER/MARK key, if you agree, to acknowledge the

warning.

The GPS Information Page appears as the receiver begins acquiring satellites. From this or any

other page, you may also adjust the screen backlighting.

The GPSMAP 178C’s adjustable screen backlighting is controlled with the POWER key. The back-

light can cycle through minimum, user-deﬁned, and maximum backlight levels by repeatedly pressing

the POWER key.

To adjust the backlighting and contrast:

1. Press POWER and the Light/Contrast window appears.

Use the ARROW KEYPAD to move the backlighting slider

UP for brighter or DOWN for dimmer backlighting. Press

LEF or RIGHT to adjust the display contrast.

2. Press POWER again and the user-deﬁned level of backlighting activates. You may adjust this level

by pressing UP or DOWN on the ARROW KEYPAD. If you press POWER one more time, the back-

lighting is at the minimum setting. Press LEFT (brighter) or RIGHT (darker) to adjust the contrast

3. Press ENTER or QUIT when done.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Each page of the GPSMAP 178C Sounder’s system also features an options page, which gives you

access to other functions and features that relate to the speciﬁc page you are viewing. To get a feel for

how the option pages work, let’s put the GPSMAP 178C Sounder into simulator mode.

Simulator Mode

To activate the simulator mode:

1. Press the MENU key twice for the Main Menu. Press Up or Down on the ARROW KEYPAD until

the ‘GPS’ tab is highlighted, then press the MENU key once.

2. Use the UP or DOWN arrow of the ARROW KEYPAD to highlight the ‘Start Simulator’ option and

press ENTER. Choose ‘No’ to the retail demonstration and press the ENTER key.

3. Press the ENTER key to conﬁrm the ‘Running Simulator’ message that appears at the bottom of the

display. ‘Simulating’ appears at the top of the Main pages.

While in Simulator mode, a ‘Running Simulator’ message appears after 2 minutes of inactivity.

Now you’re ready to continue the rest of the simulated tour. Keep in mind that the GPSMAP 178C

Sounder does not track satellites in simulator mode, and this mode should never be used for

actual navigation. All the waypoint and route planning done in simulator mode is still retained in

memory for future use.

A “Running Simulator” message

appears after 2 minutes of

inactivity.

Download from Www.Somanuals.com. All Manuals Search And Download.

Main Pages

Getting Started

The Map Page is one of six main pages used in the GPSMAP 178C Sounder’s system. The six main

pages are the Map Page, Map/Sonar Split Page, Sonar Page, Compass Page, Highway Page, and Active

Route Page. All pages are linked together in a simple chain, which allows you to scroll through the

pages in either direction using the PAGE and QUIT keys.

Main Pages/

Map Page

Active Route Page

Compass Page

Map/Sonar Split Page

Highway Page

Map Page

Sonar Page

PAGE

QUIT

Map Page

The GPSMAP 178C Sounder’s Map Page combines digital chartplotting with a user-selectable dis-

play of navigation data and a built-in worldwide database. It is also the page you use most to create and

edit waypoints and routes. Before we take off on our practice route, let’s take a brief look at its various

features and displays.

The map display shows your “boat” as a triangle marker on an electronically generated chart.

Geographic names, roads, markers and buoys that are provided by the optional BlueChart or

MapSource data are also shown. It also displays your track, routes and nearby waypoints. An on-screen

cursor lets you pan to other map areas, determine the range and bearing to a position, and perform

various waypoint and route functions.

The data window, located at the top of the page, provides a user-selectable display of various navi-

gation data, including speed over ground, distance to the next navigation point, compass ribbon, and

current position coordinates. The current map scale setting is located at the bottom right of the page.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Using the Map Cursor

Working from the Map Page is a simple process that centers around the use of the cursor. Con-

trolled by the ARROW KEYPAD, the cursor is an important tool that can be used to pan to other map

locations, mark and edit waypoints and routes, and review position data of on-screen map items and

waypoints.

Map Cursor

To get a feel for using the Map Page and using the cursor, try the following exercise:

1. Use the IN/OUT keys to set the map scale to the 50 nm setting. Your boat should be near the

center of the map, at the receiver’s last known position. (If your boat isn’t where it should be, make

sure that you have initialized the receiver and acquired a position as described on pages 4-5.)

2. Use the ARROW KEYPAD to move the cursor. Notice how another data ﬁeld appears, showing the

bearing and distance from your boat to the cursor, along with the latitude/longitude of the cursor.

3. Press the QUIT key to remove the cursor and re-center your boat on the map display.

Current position

Map Scale

As you become more familiar with the cursor, you’ll see that the map display actively scrolls or

‘pans’, letting you explore areas around the world and create waypoints and routes. Wherever you

move the cursor, you’ll always be just one QUIT keystroke away from returning the map to your

present position.

Distance/

Now that you’ve seen how the Map Page can be used to monitor your present location, let’s take a

minute to learn how to mark and store your present position as a “waypoint”. Since you’re in simulator

mode, the present position displayed is the last position calculated by the receiver, which should be

the spot where you’ve initialized the unit. This also gives you an opportunity to see how the GPSMAP

178C Sounder’s keypad and ENTER/MARK key are used for data entry and changing the waypoint

name and symbol.

Bearing

Cursor

Coordinates

Map Cursor

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

To mark your present position:

1. Hold down the ENTER/MARK key until the ‘New Waypoint’ window appears then release the key.

The window shows a default three-digit waypoint name/number (001), symbol (dot), and position.

You can leave the name as the auto-assigned number, but for this exercise, lets change the name to

‘DOCK’.

Marking Waypoints

2. Use the ARROW KEYPAD to highlight the waypoint name ﬁeld (001) and press ENTER/MARK.

You see that just the ﬁrst ‘0’ is now highlighted.

3. Press LEFT on the ARROW KEYPAD to clear the name ﬁeld.

4. Press UP or DOWN on of the ARROW KEYPAD until the letter ‘D’ appears, and then press RIGHT

to go to the next space to the right, then UP or DOWN again until ‘O’ appears. Repeat this until

you have entered the name ‘DOCK’. If you make a mistake and select an incorrect character, simply

press LEFT on the ARROW KEYPAD to backspace the cursor and then UP or DOWN to correct the

entry. (If you accidentally press ENTER/MARK before you are done, simply press ENTER/MARK

again and move the highlight to where you left off.)

Press ENTER/MARK

after entering the name.

5. After you have entered all the letters, press ENTER/MARK to conﬁrm the name.

6. To access the waypoint symbol page, highlight the waypoint symbol ﬁeld, which is to the left of the

waypoint’s name and press ENTER/MARK. The default symbol is a dot.

7. You see a grid of available waypoint symbols to choose from. Use the ARROW KEYPAD to high-

light the ‘ANCHOR’ symbol.

8. Press ENTER/MARK to conﬁrm the ‘ANCHOR’ symbol.

9. Highlight ‘OK’ at the bottom of the window and press ENTER/MARK again to conﬁrm the ‘OK’

prompt and save the waypoint.

The waypoint is now stored in memory. Note that waypoints may also be created graphically from

the map display or by manually entering position coordinates. Each of these techniques is described in

the reference section of this manual.

You can choose from a list of useful symbols.

There are two Diver Down waypoint

symbols to select from: the International and

U.S. versions.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Going to a Destination

GPS is all about marking positions as waypoints and navigating to them using the receiver’s

steering guidance and map displays. We’ve already seen how to use the ENTER/MARK key to store

your present position, so it’s time to move on to the fun part—going to a destination.

Using the NAV Key

The NAV/MOB key, located on the keypad above the QUIT key, is the primary tool used to select a

destination waypoint, TracBack, or a route to navigate. The NAV key can be used in two primary ways:

•

Pressing NAV once displays a list of options from which you can select ‘Go To Point’, ‘Follow

Route’, ‘Follow Track’, or ‘Stop Navigation’.

•

Highlighting an on-screen waypoint or map item as a destination directly from the Map Page

and pressing NAV allows you to graphically select points to “Go To”.

For our simulated trip, you’re going to select a pre-programmed tour route using the ﬁrst method.

This also shows how the MENU key is used throughout the GPSMAP 178C Sounder system to provide

tab style options and functions. Let’s start by changing the position to where the practice route is

located.

Text entry for simulator position.

To change the GPSMAP 178C Sounder position in simulator mode:

1. Press the MENU key twice to display the list of Main Menu tab items.

2. Use the UP or DOWN arrow of the ARROW KEYPAD to highlight the ‘Setup’ tab, then LEFT or

RIGHT to highlight the ‘System’ submenu tab.

3. Highlight ‘Set Position’ in the simulator setup window and press ENTER.

4. From the Initialize Position page, press the MENU key. You see ‘Enter As Text’ highlighted, then

press ENTER.

5. On the Enter Position window, press ENTER then use the ARROW KEYPAD to enter N34°56.800’,

W076°24.066’ and press ENTER when done, then press QUIT to return to the Map Page.

For future practice, you may skip steps

3 and 4 and point to a location from the

Initialize Position page.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

To activate the practice route stored in memory for navigation:

1. Press NAV. The option list page appears. (If you were selecting a single waypoint to navigate

to rather than a route, you could highlight the waypoint on the map, press NAV and then press

ENTER.)

Simulated Tour

2. Use the ARROW KEYPAD to highlight the ‘Follow Route’ option. Press ENTER to conﬁrm.

3. The Select Route page appears, with the ‘GPSMAP TOUR’ route highlighted.

4. Press ENTER then highlight ‘Activate’ and press ENTER again.

To zoom in to a closer map scale:

1. Repeatedly press the IN key until the 3 nm scale displays.

You may also hold the IN or OUT keys down to quickly scroll through the map scales. The Map

Page should now display ﬁve waypoints chained together in a simple route, with your boat at the ﬁrst

route waypoint.

You can also Invert a route to

follow it in reverse.

A data ﬁeld at the top of the page now displays the speed, distance to the second route waypoint,

and a compass ribbon which shows you which way to go. To get started, let’s enter a speed for our

vessel, which we can do from the Main Menu Page.

To enter a boat speed:

1. Press the MENU key twice to display the Main Menu Page.

2. Use the ARROW KEYPAD to highlight the ‘Setup’ tab, then press RIGHT then DOWN until the ﬁeld

below the word ‘Speed’ is highlighted on the ‘System’ submenu tab and press ENTER.

3. Use the ARROW KEYPAD to enter a speed of 40 knots.

4. Press ENTER to ﬁnish, and PAGE until you return to the Map Page.

The Set Position, Track Control, Track

and Speed ﬁelds only show while in

simulator mode.

Once a speed has been entered, you’ll notice that the map automatically begins to move slowly,

keeping your boat centered on the display. The direction of movement, also called ‘track’, is controlled

by the simulator.

Download from Www.Somanuals.com. All Manuals Search And Download.

You’ll now have a clearer picture of the route you are navigating. Keep in mind that when you

exceed the usable range of the built-in database or the optional MapSource or BlueChart data in use,

the range ﬁeld displays ‘overzoom’ to indicate that you should exercise extreme caution using the map

data. Press the ZOOM IN key to zoom into the 2 nm scale. Now that you’ve zoomed in a little closer to

your route, you can pan ahead of your vessel with the cursor to review map items and create on-screen

waypoints. Move the cursor to highlight the ‘TOUR3’ waypoint— just use the ARROW KEYPAD to

move the cursor as close as possible to the waypoint (To move the cursor in small increments, try a

series of short key presses).

Getting Started

Reviewing/Creating

Map Waypoints

Once the cursor is over the TOUR3 waypoint, you’ll notice that the waypoint symbol and name

are highlighted. The data ﬁeld at the top of the map displays the waypoint name, the range and bearing

from your present position, and the coordinates for the waypoint.

To review the waypoint page for a selected waypoint:

1. With the waypoint highlighted, press ENTER.

The waypoint ‘highlights’

when the cursor is moved

over it.

2. To return to the Map Page, press ENTER again or press QUIT.

The cursor can also be used to create new waypoints right from the map display.

To create a new waypoint using the cursor:

1. Use the ARROW KEYPAD to move the cursor as close as possible to the following position:

N35º 02.914; W 076º 26.152’ (Use the data window to verify the cursor position.)

2. Press and release the ENTER/MARK key to capture the cursor position. Do not hold the button

down, as doing so marks your present position, not the map position.

3. Use the ARROW KEYPAD to highlight the waypoint symbol ﬁeld to the left of the waypoint name/

number.

4. Press ENTER to access the symbol page.

Waypoint numbering starts with

001 and continually counts up,

even if the waypoint name has

been deleted.

5. Use the ARROW KEYPAD to select the ‘Shipwreck’ symbol and press ENTER to conﬁrm.

6. Highlight ‘OK’ and press ENTER again to ﬁnish.

Download from Www.Somanuals.com. All Manuals Search And Download.

Map/Sonar Split Page

Getting Started

The Map/Sonar Split Page combines the Map Page on the left half with the Sonar Page on the right

by default. You may adjust the size of the split (pg 32). Press PAGE key to proceed to the Sonar Page.

Map/Sonar Split &

Sonar Pages

Sonar Page

The Sonar Page is where your GPSMAP 178C Sounder becomes a powerful ﬁshﬁnder. The top left

of the screen contains data ﬁelds, while the Adjustment Bar above the data ﬁelds allows direct access

to the settings most commonly changed while using the Sonar Page. The middle of the page contains a

right-to-left moving sonar image of the water beneath your boat (Items appear as they pass under your

transducer. Those items on the right side of the screen are closer to you than those on the left.). Along

the right side of the screen is an adjustable scale which reﬂects the depth of the area being displayed. If

the unit does not detect a transducer attached to the unit, a “Sonar Turned Off” message appears across

the Sonar Page. You may also show a sonar ﬂasher and color bar on the right side.

Data Fields

Adjustment

Simulated

Fish Arch

Depth

Scale

Bottom

Flasher

The sonar display may also be set to show a split screen view of a zoomed portion of the sonar,

bottom lock (display scaled from the bottom up), or a combination of these options (see pg. 34). For

example, you may choose to show dual frequency at a 2X zoom (Dual 2X) on one half and normal

range dual frequency (Dual) returns on the other half. The current display mode is displayed at the

bottom of each sonar display.

Thermocline

Sonar Page

Sonar returns show as red (strongest), then oranges (strong), yellows (medium), greens (weaker)

and blues (weakest). The ‘Fish Symbols’ option (see page 38) allows you to view the actual sonar data,

a ﬁsh symbol, or a combination of both. ‘Fish Symbols’ appear as green. When the unit is set to ‘Dual’

frequency (see page 35), the appearance of the ﬁsh symbols (and simulated ﬁsh returns) changes. Fish

symbols from the narrower beam (200kHz) are solid (or narrow returns), but the symbols from the

wider beam (50kHz) are hollow (or wide returns). Fish icons are displayed in three different sizes.

Actual ﬁsh returns may not always appear as perfect arches, due to the speed, ﬁsh orientation, and/or

other conditions.

Outer edge

beam returns

Center beam

return

Frequency

mode

More on understanding the Sonar Page may be found on pages 33 and in Appendix G.

Dual frequency returns

Download from Www.Somanuals.com. All Manuals Search And Download.

Using the Adjustment Menu

Getting Started

The Adjustment Menu allows direct access to the settings and features most commonly used on

the Sonar Page. There are 10 main adjustment options available: Range, Zoom, View/Span, Gain,

Target Level, Whiteline, Frequency, Depth Line, Noise Reject, and Scroll. The currently selected option

appears in the upper left of the display with up and down arrows on either side of the option name.

Sonar Page

To select an adjustment option from the Sonar Page:

1. Press the ARROW KEYPAD LEFT/RIGHT to scroll through the options in the upper left of the

display, then press ENTER to access the desired option’s adjustment window.

OR:

1. Press MENU, highlight ‘Adjustments’ and press ENTER. A list of all options and their current set-

tings appears, with the selected option highlighted. Press UP/DOWN on the ARROW KEYPAD to

select the desired option and press ENTER to access the adjustment window.

Press MENU, highlight ‘Adjust-

ments’ and press ENTER to see a

list of all options and their current

settings.

To easily exit any of the adjustment options, press the QUIT key.

To change an Adjustment Menu setting:

1. Select an adjustment option to change using one of the two methods described above. The adjust-

ment window automatically times out and disappear when idle for 20 seconds.

2. Press the ARROW KEYPAD UP/DOWN to place the pointer or setting bar at the desired setting,

range or percentage (Off, 1-100%).

3. Press ENTER or QUIT to exit the adjustment window; or press LEFT/RIGHT on the ARROW

KEYPAD to view another adjustment window.

To change a setting back to ‘Normal’ or ‘Auto’:

1. On the adjustment window for the desired option, press MENU.

2. Select the desired setting and press ENTER.

Zoom adjustment options

For detailed information on the functions and options of the Sonar Page, see page 33. To learn

more about how sonar works, see Appendix G.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Now that we’re navigating to an actual destination, let’s move on to the GPSMAP 178C Sounder’s

navigation pages by pressing the PAGE key.

Compass Page

The Compass Page provides graphic steering guidance to a destination waypoint, with an emphasis

on the bearing to your destination and current direction of travel. The middle of the page features a

rotating ‘compass ring’ that shows your course over ground (track) while you’re moving, and a bearing

pointer that indicates the direction of the destination (bearing) relative to the course over ground.

The compass ring and pointer arrow work independently to show—at a glance—the direction of your

movement and the direction to your destination. For instance, if the arrow points up, you are going

directly to the waypoint. If the arrow points any direction other than up, turn toward the arrow until it

points up—then continue in that direction. Bacause the compass rings uses GPS technology, you must

be moving in order for the track to display properly.

Data

Fields

Compass

Ring

Current

Destination

The current speed, distance to the next waypoint, turn angle, and time to the next waypoint

display at the top of the screen. When you are not navigating to a waypoint, the compass shows your

direction of travel as you move, but the arrow does not appear.

Pointer

Arrow

The Compass Page allows for precision navigation to one degree of steerage. The default page

displays one row of medium numbers ﬁelds. You may customize the Compass Page to display the size

and number of ﬁelds along with the type data you wish to see. (See pages 30-31 for changing the types

of data.)

Compass Page

Let’s move on to the Highway Page by pressing the PAGE key.

Download from Www.Somanuals.com. All Manuals Search And Download.

Highway Page

Getting Started

The GPSMAP 178C Sounder’s Highway Page also provides graphic steering guidance to a destina-

tion waypoint, placing greater emphasis on the straight-line desired course and the distance and direc-

tion you are off course. As you head toward your destination, the middle of the screen provides visual

guidance to your waypoint on a moving graphic “highway.” Your present position is at the bottom

center of the highway display. The line down the middle of the highway represents your desired course.

Highway Page

Data

Fields

Present

Position

As you navigate toward a waypoint, the highway actually moves, indicating the direction you’re off

course. To stay on course, simply steer toward the center of the highway or “keep it on the road”. The

default data ﬁelds at the top of the page indicate ‘Speed’ and ‘Distance To Next’ point, along with ‘To

Course’ which shows the bearing to get you back on course and ‘Time To Next’ point. Use the Highway

Page as your primary navigation page (in lieu of the Compass Page) when your main concern is follow-

ing a deﬁned course.

Current

Destination

Zoom

Scale

Desired

Course

Highway Page

Whenever the GPSMAP 178C Sounder is in simulator mode, you can also adjust your speed and

course from the Highway Page using the ARROW KEYPAD. As you head toward each waypoint

in the tour route, try adjusting your boat speed and course to get a feel for how the Highway Page

works.

To adjust the simulated boat speed/heading from the Highway Page:

1. Press the UP arrow of the ARROW KEYPAD to increase the speed in 10 knot/kph/mph increments.

Press the DOWN arrow to decrease the speed in the same increments. Press the LEFT and RIGHT

arrows of the ARROW KEYPAD to steer the boat (adjust the heading).

NOTE: In simulator mode, you may also change the simulated speed by pressing UP or

DOWN on the ARROW KEYPAD from the Compass page.

)

Steer towards the center of the highway to get back

on course.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Notice that as you get off course, the highway moves to give you graphic guidance to get back on

course. You can zoom in or out on the Highway display for a smaller or larger view. Five available set-

tings range from 1X to 16X, with a default setting of 8X. The current scale appears in the bottom right

of the display.

Highway Page

To zoom in or out on the highway display:

1. Press either the IN or OUT key to increase or decrease the zoom scale.

Changing Data Fields

The data ﬁelds on the main pages may also be conﬁgured to display several different information

categories (see pages 30-31 for the complete list). On the Highway Page, let’s change the ‘TIME TO

NEXT’ ﬁeld to ‘TIME OF DAY’.

To change a data ﬁeld:

1. Press the MENU key to display the Highway Page options.

2. With ‘Change Numbers’ highlighted, press ENTER.

3. Use the ARROW KEYPAD to highlight ‘TIME TO NEXT’, then press ENTER.

4. On the alphabetical list of options, press UP or DOWN on the ARROW KEYPAD to highlight a selec-

tion. Press LEFT or RIGHT to jump through the list a page at a time. The scroll bar on the right side of

the window indicates the current position on the entire list of options. Select ‘TIME OF DAY’ and press

ENTER.

You may choose from several

different types of data

5. Press QUIT when ﬁnished.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

The layout of the data ﬁelds may also be changed to show more ﬁelds (with a smaller number size)

or less ﬁelds (with a larger number size). This setting is available on all of the Main Pages, except the

Active Route Page.

Changing Data Fields/

Active Route Page

To set up the page layout:

1. Press the MENU key to display the Page options.

2. Highlight ‘Set Up Page Layout’ and press ENTER.

3. The current setting displays, press ENTER to change. Use the ARROW KEYPAD to highlight ‘the

desired setting, then press ENTER.

4. Press QUIT when ﬁnished.

Active Route Page

Press PAGE to see the last page appearing in the main sequence, which is the Active Route Page.

Whenever you have activated a route or Follow Track, this page lists the names of the route points

along with useful data for each point. As you navigate the route, the information automatically updates

to indicate the next point along the route. For more detailed information on the Active Route Page, see

page 64.

You may change the size of

the data ﬁelds.

Current

waypoint

Active Route Page

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Main Menu Page

As you’ve seen, the primary pages provide map, sonar, and navigation information. The tour’s last

page is the Main Menu page, which allows access to the GPSMAP 178C Sounder’s waypoint, route, and

planning functions, as well as various operational and navigation setup features, and celestial and tide

data.

Main Menu Page/

Deleting Waypoints

The Main Menu is available from any page, and is accessed through the MENU key.

To access the main menu page:

1. Press the MENU key twice (or hold down the MENU key for two seconds.).

Submenu

Tabss

The Main Menu page lists 16 vertical ‘tabs’ that are divided into categories by function. You can

view a particular menu by simply highlighting the desired tab, which shows any secondary (horizontal)

submenu tabs and options for that tab.

To get a basic feel for how the Main Menu page works, let’s delete the two waypoints you created

during the simulated tour. This ensures that you have a clean slate once you start navigating in your

home waters.

Main

Tabs

To delete the practice waypoints:

1. Use the ARROW KEYPAD to highlight the ‘Points’ menu tab. You see a list of stored waypoints

appear to the right of the Main Menu list.

Main Menu

2. Press RIGHT one time on the ARROW KEYPAD to highlight the ‘User’ submenu tab.

3. Press DOWN on the ARROW KEYPAD and highlight waypoint ‘001’ with the shipwreck symbol.

4. You may delete the waypoint by either pressing MENU, then highlighting ‘Delete Waypoint’; or by

pressing ENTER and then highlighting ‘Delete’ from the Waypoint Edit page.

5. Press ENTER to delete the waypoint, then ENTER again to conﬁrm. Repeat the above steps to

delete the ‘Dock’ waypoint also.

Download from Www.Somanuals.com. All Manuals Search And Download.

Getting Started

Congratulations! You’ve now gone through the basic operation of the Garmin GPSMAP 178C

Sounder. Your new digital chartplotter is a powerful tool with many advanced features not covered in

the Getting Started tour. For detailed instructions on using these features or performing a speciﬁc task,

please refer to the Quick Reference Guide or the appropriate reference section of this manual. The unit

is still in Simulator mode for practice, but automatically returns to it’s ‘Normal’ operation mode when

you shut it off and turn it back on.

Powering Off Unit

To turn the GPSMAP 178C Sounder off:

1. Press and hold the POWER key for about 2 seconds, until the screen is blank.

2. When the screen is blank, release the POWER key.

The next section of the manual describes the pages and functions of the GPSMAP 178C Sounder in

detail. If you are unable to locate a speciﬁc option or function, please refer to the Index.

Download from Www.Somanuals.com. All Manuals Search And Download.

Map Page

Reference

The GPSMAP 178C’s Map Page provides a comprehensive display of electronic cartography,

plotting and navigational data. When using the unit with the optional BlueChart data or MapSource

software, the map display shows your boat on a digital chart, complete with geographic names, map

items, navaids and a host of other chart features. It also plots your track and displays any routes and

waypoints you create. An on-screen cursor lets you pan and scroll to other map areas, determine the

distance and bearing to a position, and perform various route and waypoint functions.

Map Page

When the cursor is active, an additional data window appears below the data ﬁelds to indicate the

position, range and bearing to the cursor or a selected waypoint or map item. The map scale displays at

the bottom right of the page.

Data Fields

The (ZOOM) IN and (ZOOM) OUT keys, combined with the ARROW KEYPAD, let you select

zoom ranges and move the cursor. Two basic map operating modes, position mode and cursor mode,

determine what cartography is shown on the map display. Position mode pans the cartography to keep

the present position marker within the display area, while cursor mode pans the cartography to keep

the cursor within the display area.

User

Waypoint

Land

Map

Item

Boat Icon

Navaids

The GPSMAP system always powers up in the position mode, with your vessel centered on the

map display.

Water

•

When sufﬁcient map coverage is not available to keep the boat centered, the boat icon moves

toward the edge of the display.

Map Scale

Geographic Name

When the ARROW KEYPAD is pressed, the GPSMAP 178C enters cursor mode. In cursor mode:

Map Page shown using optional

MapSource data.

•

The cursor can be moved over the map display using the ARROW KEYPAD.

Whenever the cursor reaches the edge of the display, the map scrolls forward under the cursor.

Keep in mind that the boat icon moves with the map scrolling and may go off the display screen

(you may not be able to see your present position).

•

When the cursor is stationary, a ﬁxed coordinate position appears in the position ﬁeld. Note that

the distance and bearing changes as the boat’s position changes.

Download from Www.Somanuals.com. All Manuals Search And Download.

•

Whenever you zoom in cursor mode, the cursor is centered on screen.

Reference

To return to position mode, press the QUIT key.

Map Page: Cursor

When the cursor reaches the edge of the map, the unit may pause as it loads new map

data.

)

Using the Cursor

The cursor allows you to pan away from your present position and scroll to other map areas

around the world (even outside of your current detail coverage). As you pan past the edge of the cur-

rent map display, the screen actively scrolls forward to provide continuous map coverage. You see an

hourglass symbol by the pointer while the unit is busy drawing new map detail.

To move the cursor:

Move the cursor over an item

on the map to highlight it.

1. Press the ARROW KEYPAD to move the cursor in an up, down, left or right direction.

As you move the cursor, the distance and bearing from your present position to the cursor is

displayed in the data window, along with the cursor’s position coordinates. Keep in mind that when the

cursor is stationary, the distance and bearing from your present position changes as your boat moves.

The cursor may also be used to ‘snap’ to on-screen waypoints and map items, allowing you to review a

selected position directly from the map display.

Additional information

tabs.

To select an on-screen waypoint or map item with the cursor:

1. Use the ARROW KEYPAD to move the cursor to the desired waypoint or map item (if there are

Pressing ENTER/MARK

while highlighting a map

item brings up additional

details and options.

several waypoints grouped closely together, zoom in closer for a better view).

2. When a waypoint or map item is selected, it becomes highlighted on screen, with the name

and position displayed. Press ENTER to show details of the map item. When using BlueChart or

MapSource data, additional information tabs appears. Use the ARROW KEYPAD to highlight the

individual tabs to display the information and additional options.

Option buttons

Download from Www.Somanuals.com. All Manuals Search And Download.

To eliminate the cursor and re-center your position on-screen:

1. Press the QUIT key.

Reference

The cursor may also be used to create new waypoints directly from the map.

To create a waypoint with the cursor:

1. Use the ARROW KEYPAD to move the cursor to the desired map position.

2. Press the ENTER/MARK key and the ‘New Map Waypoint’ window appears. If the cursor is on

a map item, you get a new window with details about the item when ENTER/MARK is pressed.

Press ENTER again on the highlighted ‘Create Wpt’ option.

Map Page: Cursor

and Zooming

3. Press ENTER to conﬁrm the new waypoint using the default three-digit name and symbol.

Selecting Map Scales

The map display has 28 available range scales from 20 ft. to 800 mi. (5 m to 1200 km). The map

scale is controlled by the IN and OUT keys, with the current scale displayed at the bottom right of the

data window.

Creating New Map Waypoint

Using Built-In Basemap

To select a map scale:

1. Press the OUT key to zoom out and the IN key to zoom in.

The scale value represents the distance from one end of the scale bar to the other.

)

The GPSMAP 178C’s system has a built-in worldwide database to 20 mi, with more detailed

coverage available through the use of the optional BlueChart or MapSource data. The GPSMAP 178C

displays cartography as long as there is chart information available for the range you’ve selected. Map

coverage conforms to the following conditions:

•

When the selected zoom range is covered by either the internal database, BlueChart, or

MapSource data, cartography is displayed.

Using BlueChart/MapSource Data

Overzoom, no additional data

When the selected zoom range is covered by both the internal database and BlueChart/

MapSource data, cartography is displayed using the data with the best resolution.

When the selected zoom range exceeds the resolution of the data in use, overzoom cartography

is displayed and an ‘overzoom’ warning appears below the scale ﬁeld.

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

Map Page Options

Many features of the GPSMAP 178C are menu driven. Each of the main pages have an options

menu, allowing you to custom tailor the corresponding page to your preferences and/or select special

features that speciﬁcally relate to that page. The data window, located at the top of the main pages

provides a user-selectable layout of various types of useful data. Each data ﬁeld may be conﬁgured to

display any one of several data options. The data window layout may also be changed to display addi-

tional data ﬁelds and change the actual size of the data displayed.

Map Page: Options

The GPSMAP 178C’s Map Page provides access to functions and features relating to the Map Page

and the layout options.

To display the Map Page options:

1. Press MENU.

To select a menu option:

1. Use the ARROW KEYPAD to highlight the desired option and press ENTER.

The available options are Full Screen Map/Show Data, Measure Distance, Set Up Map, Set Up Page

Layout, Change Numbers, and Turn Declutter On/Off. Following are details on using each of these

options.

Map Page Options

• Full Screen Map/Show Data — toggles between a Map Page without or with data ﬁelds on the

map display. The unit defaults back to ‘Show Data” the next time it is powered on.

To maximize the map/show data ﬁelds:

1. Highlight the ‘Full Screen Map’ option and press ENTER. The Map Page is now maximized with no

data ﬁelds.

2. To show the data ﬁelds again, press MENU, highlight ‘Show Data’ and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

• Measure Distance— allows you to measure the bearing and distance between any two points

on the map display.

Reference

To measure the Bearing/distance between two points:

Map Page Options

1. Highlight the ‘Measure Distance’ option and press ENTER. An on-screen pointer appears on the

map display at your present position with ‘ENT REF’ below it.

2. Move the cursor to the desired reference point (the point that you want to measure from) and

Cursor

Coordinates

press ENTER.

3. Move the cursor to the point that you want to measure to. The bearing and distance from the refer-

ence point and cursor coordinates is displayed in the data window at the top of the display. Press

the QUIT key to ﬁnish.

Distance and

Bearing

• Set Up Map— allows you to conﬁgure the map display to your preferences, including map

detail, map orientation, automatic zoom, and various map items and points. The map set up option

uses a ‘ﬁle tab’ feature, making it easier to organize the various settings for ease of use. The following

table lists the ﬁle tabs and the settings available under each tab:

Map Cursor

General

Source

Detail, Orientation, AutoZoom, Color Mode

Basemap, Data Card Maps

Full screen map shown

Waypoints

Points

Navaids

Nav Line

Track

Waypoints, Active Route

Spot Soundings, Tide Stations, Services

Symbol Set, Symbol Size, Text Size, Light Sectors

Heading Line, Bearing Line, Course Line

Saved Tracks, Track Log

Other

Accuracy Circle, Lat/Lon Grid, Map Outlines

To change a map setup feature:

1. From the Map Page menu, highlight ‘Set Up Map’ and press ENTER.

2. Move LEFT or RIGHT on the ARROW KEYPAD to highlight the desired tab, then UP or DOWN on

the ARROW KEYPAD to move the highlight to the setting you want to change and press ENTER.

Main Menu—

Map Conﬁguration Tab

3. Move UP or DOWN on the ARROW KEYPAD to highlight to the desired setting and press ENTER.

To exit, press QUIT.

Download from Www.Somanuals.com. All Manuals Search And Download.

General Tab

Detail— Most, More, Normal, Less, Least: controls how much map detail displays. Those

Reference

features which have a speciﬁed scale or turned “Off” are unaffected by this setting.

Map Page Options

Orientation— North Up— ﬁxes the top of the map display to a north heading; Track Up

Below— ﬁxes the top of the map display to the current track heading and centers your position

on the lower portion of the screen. Set to ‘Off; for constant Track Up. The numeric value is the

range the unit switches to North Up when zooming out.; Course Up— ﬁxes the map so the

direction of navigation is always “up” and turns the navigation leg line vertical on the screen.

General Tab

AutoZoom— On/Off: when “On” the map automatically adjusts the map scale to a lower scale

as you approach you destination point.

Color Mode — For Sun, For Dark: “For Sun” mode uses a bright color scheme for daylight

viewing. “For Dark” mode uses a dark color scheme for night viewing.

Source Tab

Basemap— On/Off: turns the built in base map on or off.

Data Card Maps— On/Off: turns all optional BlueChart/MapSource data loaded on the data

card on or off. The ‘Data Card Maps’ option box shows a list of the optional BlueChart/

MapSource data loaded on the data card. Each area is described by name and may be dese-

lected if you do not wish to display the data on the Map Page.

To display the Map Information Page:

‘Data Card

Maps’ Map

Information

Page

1. Highlight the ‘Data Card Maps’ option box and press ENTER.

2. Use the ARROW KEYPAD to scroll through the list of maps.

3. To select/deselect a map family, highlight the check box to the left of the name and press ENTER

to select/deselect the map. The map is selected and is displayed on the Map Page when an “9”

appears in the box adjacent to that map. You may also press MENU and choose to ‘Show All’ or

‘Show None’ and press ENTER.

(continued)

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

4. To display detailed information/notes for each area or to turn individual maps in the family on/off,

highlight the family name and press ENTER. To view the notes for that area, choose ‘Show Notes’.

To scroll through the notes, you may either highlight the notes, press ENTER and use the ARROW

KEYPAD to scroll UP, DOWN, LEFT and RIGHT or press MENU and choose the desired scroll option.

Map Page: Options

Waypoints Tab— Waypoints/Active Route

Text— None, Small, Medium, and Large: controls the screen size of the name.

Zoom— Auto, Off, 20 ft.-800 mi.: sets the maximum scale at which the feature should appear on

the screen. Some types of data only shows up to certain zoom scales.

Points Tab— Spot Soundings/Tide Stations/Services

Waypoints

Text— None (except Spot Snd.), Small, Medium, and Large: controls the screen size of the name.

Tab

Zoom— Auto, Off, 20 ft.-800 mi.: sets the maximum scale at which the feature should appear on

the screen. Some types of data only shows up to certain zoom scales.

Navaids Tab—

Symbol Set— Auto, GARMIN, NOAA, International: controls the desired navaid symbol set.

Points Tab

Auto - BlueChart maps are drawn using symbols similar to the NOAA/NIMA standard. Non-

BlueChart maps are drawn using traditional Garmin symbols.

GARMIN - All maps are drawn using traditional Garmin symbols.

NOAA - All maps are drawn using a symbol set similar to NOAA/NIMA.

International - All maps are drawn using a symbol set similar to the IALA symbol set.

Symbol/Text Size— Small, Medium, and Large: controls the screen size of the symbol/name.

Navaids Tab

Light Sectors— Off, Auto, On: controls the drawing light sectors on the map. Color units indicate

the actual color of each sector using the color of the light.

Off— No light sectors are ever drawn.

Auto— Light sectors appear when you point to them with the map cursor.

On— Light sectors are drawn for all lights that have them.

Download from Www.Somanuals.com. All Manuals Search And Download.

Nav Line Tab—

Reference

Heading Line— On/Off: draws an extension from the end of the boat icon in the direction of

travel.

Map Page: Options

Bearing Line— On/Off: toggles the black/white line which points to the current navigation point.

Course Line— Auto, Off, 20 ft.-800 mi.: sets the maximum zoom scale at which the desired

course line should appear on the screen.

Track Tab— Saved Tracks/Track Log

Zoom— Auto, Off, 20 ft.-800 mi.: sets the maximum scale at which the feature should appear on

the screen. Some types of data only display up to certain zoom scales.

Nav Line Tab

Other Tab—

Accuracy Circle— On/Off: toggles the circle “On” and “Off”. The circle represents the approximate

accuracy of the unit based on EPE, DOP, and basemap quality. Your position is within the circle.

Lat/Lon Grid— Text— None, Small, Medium, and Large: controls the screen size of the name.

Zoom— Auto, Off, 20 ft.-800 mi.: sets the maximum scale at which the feature should appear.

Map Outlines— On/Off: toggles the coverage boxes for BlueChart/MapSource data “On” and “Off”.

From the map setup page, you can access the following menu options by pressing MENU:

• Defaults— restores settings back to factory settings for the tab highlighted.

Track Tab

Other Tab

• All Map Defaults— restores settings back to factory settings for all tabs.

• Set Up Page Layout — the layout of the data ﬁelds may be changed to show more ﬁelds (with a

smaller number size) or less ﬁelds (with a larger number size). You may also choose to show a Compass

Tape on the Map Page only.

To set up the page layout:

1. Press the MENU key to display the Page options.

2. Highlight ‘Set Up Page Layout’ and press ENTER. (continued)

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

3. The current setting displays, press ENTER to change. Use the ARROW KEYPAD to highlight the

desired setting, then press ENTER.

Map Page: Options

4. Press QUIT when ﬁnished.

• Change Numbers — allows you to specify the type of data displayed in each data ﬁeld used on

the map display. This option is available from any of the main pages. See page 19 for instructions on

changing data ﬁeld numbers.

The following data options are available for data ﬁelds on the main pages:

• BEARING – Compass direction from your position to destination

• COMPASS – Compass ribbon

• COURSE – Desired Track

• DEPTH – Depth below transducer

Changing Page Layout

• DIST TO DESTINATION – Distance to ﬁnal waypoint

• DIST TO NEXT – Distance to next waypoint

• ELEVATION – Elevation above/below MSL (Mean Sea Level)

• ETA AT DESTINATION – Estimated Time of Arrival to ﬁnal waypoint

• ETA AT NEXT – Estimated Time of Arrival to next waypoint

• GPS ACCURACY – Shows estimated GPS accuracy

• HIGHWAY – Smaller version of the Highway Page

• MAXIMUM SPEED – Fastest speed the unit has traveled

• MOVE AVERAGE SPEED – Average moving speed

• MOVE TRIP TIME – Time unit has been moving for a trip

• OFF COURSE – Distance from desired track

• POINTER – Arrow points to your destination

• POSITION – Current position coordinates

Highlight the ﬁeld you

wish to change

• SONAR – Compressed view of sonar data

Download from Www.Somanuals.com. All Manuals Search And Download.

• SPEED – Speed over ground

Reference

• TIME OF DAY – Current time

• TIME TO DESTINATION – Time to ﬁnal waypoint

• TIME TO NEXT – Time to next waypoint

Map Page: Options

• TO COURSE – Bearing to desired track

• TOTAL AVERAGE SPEED – Total average speed

• TOTAL TRIP TIME – Total travel time of trip, stopped and moving

• TRACK – Current compass direction of travel

• TRIP ODOMETER – Trip Odometer

• TURN – Directional amount of turn needed to match bearing

• VELOCITY MADE GOOD – Velocity Made Good to destination

• VOLTAGE – Current voltage reading being received by unit

• WATER SPEED* – Speed through the water

Choose the type of data

you wish to display.

• WATER TEMP. LOG** – Timeline graph of the transducer’s temperature reading.

• WATER TEMPERATURE** – Water temperature

*If equipped with a speed sensor or speed capable transducer..

**If equipped with a temperature sensor or temperature capable transducer..

NOTE: COMPASS, HIGHWAY, POSITION, SONAR, and WATER TEMP. LOG are only available on Large and Huge

sized data ﬁelds.

• Turn Declutter On/Off — toggles between showing spot soundings and map outlines for easier

viewing.

Map Setup

Menu Options

Download from Www.Somanuals.com. All Manuals Search And Download.

Map/Sonar Split Page

Reference

The Map/Sonar Split Page combines the Map Page on the left half with the Sonar Page on the right

by default. The menu options for this page are the same as the Map Page. Any setting changes made

from the Map/Sonar Split Page will also affect the Map Page. One additional option is that you may

adjust the size of the split left or right..

Map/Sonar Split Page

• Size Split — enables width adjustment of the Map/Sonar Split Page . You may adjust the size of

the map/sonar split window anywhere from 1/3 to 2/3 width from the edges of the screen.

To resize the Map/Sonar Split Page:

1. From the Map/Sonar Split Page, press MENU.

2. Highlight ‘Size Split’ and press ENTER.

3. Use the ARROW KEYPAD to move the horizontal double-arrow LEFT or RIGHT until the desired

vertical width line shows, then press ENTER.

Map/Sonar Split Page

You may resize the split to the

left or right.

Download from Www.Somanuals.com. All Manuals Search And Download.

Sonar Page

Reference

The Sonar Page is where your GPSMAP 178C Sounder becomes a powerful ﬁshﬁnder. Fish are

The Sonar Pa

The top left of th

ﬁelds allows direc

Page. The middle

beneath your boa

right side of the s

the screen is an a

the unit does not

appears across th

right side.

displayed as colored arches or as ﬁsh icons in three different sizes. Thermoclines are shown as shades

of blue. The sonar display may also be set to show a split screen view of a zoomed portion of the sonar,

bottom lock (display scaled from the bottom up), or a combination of these options (see pg. 34). For

example, you may choose to show dual frequency at a 2X zoom (Dual 2X) on one half and normal

range dual frequency (Dual) returns on the other half. The current display mode is displayed at the

bottom of each sonar display. For more information on understanding sonar and the display, see page

14 and Appendix G.

Sonar Page

Using the Adjustment Menu

The Adjustment Menu allows direct access to the settings and features most commonly used on the

Sonar Page. The currently selected option appears in the upper left of the display.

The sonar dis

of the sonar, bott

options (see pg. 3

(Dual 2X) on one

The current displ

Sonar Page

To select an adjustment option from the Sonar Page:

1. Press the ARROW KEYPAD LEFT/RIGHT to scroll through the options in the upper left of the

display, then press ENTER to access the desired option’s adjustment window.

Sonar returns

greens (weaker) a

to view the actua

appear as green. W

of the ﬁsh symbo

beam (200kHz) a

(50kHz) are hollo

Actual ﬁsh return

tion, and/or other

OR:

1. Press MENU, highlight ‘Adjustments’ and press ENTER. A list of all options and their current set-

tings appears, with the selected option highlighted. Press UP/DOWN on the ARROW KEYPAD to

select the desired option and press ENTER to access the adjustment window.

To easily exit any of the adjustment options, press the QUIT key.

To change an Adjustment Menu setting:

1. Select an adjustment option to change using one of the two methods described above. The adjust-

ment window automatically times out and disappear when idle for 20 seconds.

Press MENU and highlight ‘Adjust-

ments’ to see a list of all options and

their current settings.

2. Press the ARROW KEYPAD UP/DOWN to place the pointer or setting bar at the desired setting,

range or percentage (Off, 1-100%). (continued)

Download from Www.Somanuals.com. All Manuals Search And Download.

3. Press ENTER or QUIT to exit the adjustment window; or press LEFT/RIGHT on the ARROW KEYPAD

Reference

to view another adjustment window.

Sonar Page:

Adjustment Menu

To change a setting back to ‘Normal’ or ‘Auto’:

1. On the adjustment window for the desired option, press MENU.

2. Select the desired setting and press ENTER.

Adjustment Menu Options

Range— sets the display depth range used for viewing. The unit can be set to automatically track

the bottom or set to a user-speciﬁed depth range. Auto mode displays the most information possible

while continuously showing the bottom.

Zoom— used to quickly select a display zoom scale or split the display. When a scale other than ‘No

Zoom’ is selected, the Adjustment Menu displays a new selection labeled ‘View.’ Split screens display

the same frequency (50kHz, 200kHz, or Dual) on both sides.The Zoom setting is divided into six

display levels:

Zoom Adjustment

Range Adjustment

• 2X Split: shows two reduced-size sonar pictures at the same time. The right half of the display

screen shows the complete sonar picture at its original scale. The left half shows a portion of the

original picture at 1/2 depth scale.

• 2X Zoom: displays the 2X zoomed picture on the full screen and does not show the original

depth scale.

• 4X Split: shows two reduced pictures; the right at the original depth scale and the left at 1/4 the

original depth scale.

• 4X Zoom: displays only the 4X zoomed picture on the full screen.

• Btm (Bottom) Split: shows two reduced pictures; the right at the original depth scale and the left

showing sonar returns from the bottom up. All target depths read as a distance from the bottom.

4X Split Zoom Display (Dual Frequency Mode)

• Btm (Bottom) Lock: displays only the Bottom Lock picture (returns from the bottom up) on the

full screen.

Download from Www.Somanuals.com. All Manuals Search And Download.

Once activated, the zoomed picture becomes the Sonar Page display. You may also cycle through

the sonar zoom display levels by pressing the IN or OUT keys. The Zoom function can be deactivated

by pressing the OUT key until the ‘No Zoom’ setting appears.

Reference

Sonar Page:

View/Span— available when a Zoom scale other than ‘No Zoom’ is selected. The ‘View’ or ‘Span’

setting is used to change the viewing range of a zoomed display. If the Zoom is set to 2X split or 4X

split, only the zoomed portion on the left side of the screen is affected by the change. If the Zoom

is set to Bottom Split or Bottom Lock, ‘Span’ adjusts how far off the bottom the unit displays data.

In Zoom mode, you can control the view of the left side of the split.

Adjustment Menu

Gain— allows you to control the sensitivity of the unit’s receiver. This provides some ﬂexibility in

what is seen on the display. To see more detail, increase the receiver sensitivity by selecting a higher

gain percentage. If there is too much detail or if the screen is cluttered, lowering the sensitivity may

increase the clarity of the display.

View Adjustment

Gain Adjustment

Target Level— adjusts the color range of a return (or target). A Color Bar (see also page 39)

appears on the right side of the screen as you adjust this setting. A higher percentage setting results

in stronger-signaled returns (see page14). This setting does not increase/decrease the unit Gain.

Whiteline— controls how the unit displays information about the bottom type (hard or soft).

With the Whiteline ‘Off’, the bottom return displays as red and contains no information on bottom

hardness. With Whiteline set at ‘Normal’ or 1-100%, the bottom return becomes white with a red

line indicating where the water meets the bottom. To turn the Whiteline Off, press the ARROW

KEYPAD DOWN until the setting bar is all the way at the bottom of the range and reads “Off”. See

page 114 for more detail on this feature.

Target Level Adjustment

Whiteline Adjustment

Frequency— allows you to choose a transducer frequency. Frequency refers to the “pitch” of

the sound that the transducer sends and receives. You may choose ‘200kHz’, ‘50kHz’ or ‘Dual’

frequency.

Frequency Adjustment

Download from Www.Somanuals.com. All Manuals Search And Download.

Depth Line— adds a horizontal depth line across the display which is used to measure the depth

of underwater objects. The depth of the line appears in a box on the right side of the line. Press UP

or DOWN on the ARROW KEYPAD to control the position of the line on the graph. The depth is

displayed in a window on the right side of the line. To turn the Depth Line Off, press the ARROW

KEYPAD UP until the setting bar is all the way at the top of the range and reads “Off”.

Reference

Sonar Page Options

Noise Reject— helps ﬁlter unwanted noise from the graph. The ‘Noise Reject’ tool can be turned

‘Off’, set to ‘Normal’ (automatically adjusts for optimum viewing) or to a ﬁxed 1-100% setting.

When setting the Noise Reject tool: the HIGHER the noise rejection setting, the unit is more likely

to NOT show ﬁsh or structure. To turn the Noise Reject Off, press the ARROW KEYPAD DOWN

until the setting bar is all the way at the bottom of the range and reads “Off”.

Scroll— adjusts the rate that the graph scrolls from right to left. If you are sitting still or the graph

is moving too fast, slowing the scroll rate or pausing it can be beneﬁcial.

Depth Line

Adjustment

Noise Reject

Adjustment

Sonar Page Options

Scroll

Adjustment

The GPSMAP 178C Sounder’s Sonar Page features a menu page that provides access to additional

functions and to layout and data ﬁeld options.

To display the Sonar Page options:

1. Press MENU.

To select a menu option:

1. Use the ARROW KEYPAD to highlight the desired option and press ENTER.

The following options are available:

• Adjustments — lists the Adjustment Menu options and their current settings (see page 15).

To change an Adjustment setting:

1. On the Adjustment options list, use the ARROW KEYPAD to highlight the desired option and press

ENTER.

Sonar Page Menu Options

2. Use the ARROW KEYPAD to make the desired change and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

• Show/Hide Pointer — allows you to reference sonar items and mark underwater waypoints.

This makes it easier to ﬁnd and use an object such as a stump for a future ﬁshing location. When

using this feature, the Sonar Page pauses. The pointer does not move off the paused display and

cannot show an area that has scrolled off the screen. The depth is updated while the display is

paused, but the unit does not show any new sonar data until the standard Sonar Page is resumed.

You may see a discontinuity from where the sonar information stops to where it starts again.

Reference

Sonar Page Options

Data Window

To mark an underwater waypoint:

1. From the Sonar Page, press MENU, highlight ‘Show Pointer’ and press ENTER to pause the screen

movement.

2. Use the ARROW KEYPAD to move the cursor onto the target (underwater drop off, stump, etc.)

you want to mark. The data window at the top of the screen displays the cursor’s depth, coordi-

nates, and bearing and distance from your current position.

Pointer

3. Press ENTER/MARK. The New Waypoint page appears with the waypoint’s coordinates, default

‘Show Pointer’ option enabled

three-digit name, and pointer depth automatically ﬁlled in.

4. To change the name, symbol or depth, highlight the appropriate ﬁeld and press ENTER. Make your

changes and press ENTER when done.

5. When done, move the ﬁeld highlight back to the ‘OK’ prompt and press ENTER.

6. To return to the standard Sonar Page, press QUIT; or press MENU, then highlight ‘Hide Pointer’

and press ENTER.

• Show/Hide Numbers — toggles showing/hiding the data ﬁelds on the sonar display.

• Size Split — enables width adjustment of the Sonar Page split screen. This option is only

available when a split screen zoom scale is selected. You may adjust the size of the split window

anywhere from 1/4 to 3/4 width of the right half of the Sonar Page.

To resize the Sonar Page split screen:

1. From the Sonar Page split screen, press MENU.

2. Using the ARROW KEYPAD, highlight ‘Size Split’ and press ENTER.

‘Show Numbers’

option enabled

Download from Www.Somanuals.com. All Manuals Search And Download.

3. Move the horizontal double-arrow LEFT or RIGHT using the ARROW KEYPAD until the desired

vertical width line shows, then press ENTER.

Reference

4. If you wish to cancel this operation, press QUIT or press MENU, highlight ‘Cancel Resize’ and press

ENTER.

Sonar Page Options

• Set Up Sonar — jumps to the Sonar tab of the Main Menu, which contains sonar conﬁgura-

tion settings that should not require frequent change. You may also press MENU twice from any

screen, then highlight the ‘Sonar’ tab using the ARROW KEYPAD. Press RIGHT on the ARROW

KEYPAD to access the selection ﬁelds. Each time the Setup Menu is accessed, the unit returns to

the last edited selection ﬁeld.

Double-Arrow

To change a setting on the Sonar tab:

1. Using the ARROW KEYPAD, highlight the desired ﬁeld and press ENTER and the available options

appears.

‘Size Split’ Menu

Options

Resizing the Split Sonar Display

2. Highlight the desired setting and press ENTER.

3. Press QUIT to return to the Sonar Page or previous page.

Sonar Tab Options

Fish Symbols Off— All available information

is displayed .

Fish Symbols — allows you to determine how the graph displays underwater targets and back-

ground information. If Fish Symbols are set to ‘Off’, the unit displays all of the available informa-

tion about the underwater environment. If a ﬁsh symbol is selected, the graph displays only the

information related to that symbol. Actual ﬁsh returns may not always appear as perfect arches

(like in simulator mode), due to the speed, ﬁsh orientation and/or other conditions.

Suspended targets displays as ﬁsh symbols.

Background information is displayed .

Same as above with the target depth attached.

Water Type — since sound waves travel through ‘Fresh’ and ‘Salt’ water at different rates it is

necessary to select the ‘Water Type’ to ensure accurate readings on the unit.

Suspended targets display as ﬁsh symbols. No

background information is displayed .

Depth Number — controls the efﬁciency of the digital depth update rate.’Fast Update’ updates

more quickly and is recommended for low-noise, deeper water (>50 ft.). ‘Auto’ is best for shallow

water or high noise areas, has a slower screen update and is best used if you travel a wide variety of

depths.

Same as above with target depth attached.

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

If the unit is unable to track the bottom for any reason, the digits in the depth window

ﬂashes on and off to alert you that the unit is not tracking the bottom.

Sonar Tab Options

Scale — controls the depth ‘Scale’ displayed vertically along the right side of the graph. The depth

‘Scale’ can be conﬁgured to display four different ways: as an ‘Overlay’, in the ‘Corners’, with ‘Basic’

or ‘No Scale’.

Color Bar — shows a gradient scale of the current Target Level setting (see page 35).

Flasher — with the ‘Flasher’ active, a graphic Flasher representation is displayed on the far right

side of the graph. This graphic Flasher displays structure and bottom returns much the same as a

true Flasher. You may ﬁnd this feature particularly useful when using ‘Fish Symbols’.

Temperature Graph — toggles On or Off the display of a temperature graph on the Sonar Page.

The graph is synchronized with the returns on the sonar display.

Main Menu—Sonar Tab

Depth Scale (Overlay)

Background Color — sets the background color on the Sonar Page to Black, Blue or White.

Keel Offset — used to offset the surface reading for the depth of a keel. This makes it possible to

measure depth from the bottom of your keel instead of from the transducer’s location. Enter a posi-

tive number to offset for a keel, or enter a negative number to compensate for a large vessel that

may draw several feet of water. The ‘Keel Offset’ is reﬂected in the depth reading.

Map Split Sonar Detail — controls Map/Sonar Page sonar split range scale. ‘Full Range’ shows

right side scale of 2X or 4X split Sonar Page. ‘Maximum Detail’ displays what is shown on the left

side of a split sonar screen.

Color Bar

Calibrate Water Speed — this is only available if you are using a speed-capable transducer/sensor.

Calibration is required to ensure that the Water Speed displayed on your unit is accurate. The unit

automatically uses the GPS ground speed, if it is available, for comparison on the calibration. If a

GPS ground speed is not available, use either your boat’s speedometer reading (not always accu-

rate) or a stopwatch to determine your speed over a certain distance (distance / time = speed). It is

recommended that the calibration take place in water having little or no current.

Flasher

Download from Www.Somanuals.com. All Manuals Search And Download.

To calibrate the water speed:

1. On the Sonar tab, use the ARROW KEYPAD to highlight ‘Calibrate Water Speed’ and press

ENTER.

Reference

Sonar Page Options

2. Bring the boat to a cruising speed. The top ground and uncalibrated water speeds are shown at

the bottom of the calibration window. Note your top water speed, then stop the boat and press

ENTER.

Keel Offset:

Transducer at Surface

Enter (+) positive

number to show depth

from bottom of keel

3. By default, the top ground speed is automatically shown in the ‘What was your top water speed?’

ﬁeld. If a ground speed is not available, the top uncalibrated water speed is used instead. If the new

speed is correct, highlight ‘OK’ and press ENTER. If you wish to manually enter a calibration, press

ENTER on the speed ﬁeld, enter a new speed and press ENTER.

4. You may also press MENU from the calibration screen and choose ‘Use Top Ground Speed’ to

default back to ground speed or ‘Use No Calibration’ to use the speed sensor’s uncalibrated speed.

NOTE: If the boat is not moving fast enough or the speed sensor is not outputting

Keel Offset: Transducer

at Bottom of Keel

Enter (-) negative number to

show depth from surface

a speed, you see a “Boat Is Not Moving Fast Enough To Calibrate” message at the

bottom of the display. Check that the speed sensor wheel is moving or safely increase

boat speed. If there is a problem with the speed sensor/unit or if a speed senor is not

installed, a “Water Speed Sensor Is Not Working” message appears at the bottom of

the display. Check connections of speed sensor cables.

• Set Up Page Layout — layout of the data ﬁelds may also be changed to show more ﬁelds (with a

smaller number size) or less ﬁelds (with a larger number size). See page 29.

• Change Numbers — allows you to specify the type of data displayed in each data ﬁeld. For detailed

instructions on changing the data ﬁelds on the Sonar Page, see pages 30-31

• Page Defaults — restores the Sonar Page settings to the original factory setup.

To restore default settings to the Sonar Tab:

Calibrating the

Speed Sensor

1. Press MENU. With ‘Page Defaults’ highlighted, press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

Compass Page

The GPSMAP 178C Sounder features two different navigation pages: Compass and Highway. When-

ever a NAV goto, Follow Track (TracBack), or Follow Route have been activated, the GPSMAP 178C

Sounder’s Compass Page guides you to your destination with digital readouts and a graphic compass

display, which includes a bearing pointer. Use this page (instead of the Highway Page) when your desired

path may be varied in direction. The middle of the page features a rotating ‘compass ring’ that shows your

course over ground (track) while you’re moving. Your present course over ground is indicated at the top

of the compass ring. A bearing pointer arrow, in the middle of the compass ring, and a bearing ‘bug’ indi-

cator on the outside of the compass ring, indicate the direction of the destination (bearing) relative to the

course over ground. The compass ring and pointer arrow work independently to show—at a glance—the

direction of your movement and the direction to your destination. For instance, if the arrow points up,

you are going directly to the waypoint. If the arrow points any direction other than up, turn toward the

Compass Page

Data Fields

Destination

arrow until it points up, then continue in that direction.

Bearing

‘Bug’

The bearing pointer, bearing bug and/or compass ring may point in various directions

when you are stationary or at very low speeds. Once you start moving, the pointer is

correct.

Bearing

Pointer

Compass

Ring

The GPSMAP 178C’s Compass Page features a menu page that provides access to layout and data

ﬁeld options. The data window, located at the top of the page, provides a user-selectable layout of vari-

ous types of useful data. Each data ﬁeld may be conﬁgured to display several data options.

To display the Compass Page options:

1. Press MENU.

To select a menu option:

1. Use the ARROW KEYPAD to highlight the desired option and press ENTER.

For detailed instructions on changing data ﬁelds and layout of the Compass Page, see pages 29-31.

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

Highway Page

When a Go To, TracBack, or route has been activated, the GPSMAP 178C’s Highway Page provides

digital and graphic steering guidance to the destination. The top half of the Highway Page features

user-selectable data ﬁelds that display useful navigation data. The bottom section of the screen provides

visual guidance to the waypoint on a graphic highway display. The line down the center of the highway

represents your desired track line.

Highway Page

As you head toward your destination, the highway perspective moves to indicate your progress to

the waypoint and which direction you should steer to stay on course. If you are navigating a route, the

Highway Page shows each route waypoint in sequence connected by a red “road” with a yellow line

down the middle, which is your desired track line. Nearby waypoints not in the active route can also

be displayed. The highway perspective scale may also be zoomed in or out to display a larger or smaller

view of the highway. Five settings are available from 1X to 16X, with a default setting of 8X.

Data Fields

Current Nav Point

Route Waypoints

To change the highway perspective scale:

1. Press the ZOOM IN or ZOOM OUT key to select the desired setting.

The Highway Page options menu provides access to functions and features relating to the Highway

Page and the layout options. The data window, located at the top of the page, provides a user-selectable

layout of various types of useful data. Each data ﬁeld may be conﬁgured to display several data options.

The data window layout may also be changed to display additional data ﬁelds and change the actual

size of the data displayed.

Desired Track Line

Current Position

Zoom Scale

Highway Page

The GPSMAP 178C’s Highway Page features a menu options page that provides access to functions

and features relating to the Highway Page and the layout options.

To display the Highway Page options:

1. Press MENU.

Download from Www.Somanuals.com. All Manuals Search And Download.

To select a menu option:

Reference

1. Using the ARROW KEYPAD, highlight the desired option and press ENTER.

The following options are available from the Highway Page menu:

Highway Page Options

• Set Up Highway— allows you to select what waypoints and tracks are shown on the Highway

display. Use the ARROW KEYPAD and ENTER key to select/deselect the desired options. Four

options are available:

Check or uncheck

the options you wish

to show/hide on the

Highway Page.

• Active Route Waypoints— all active route waypoints

• User Waypoints— only nearby waypoints

• Track Log— current active track log

• Saved Tracks— any saved track logs

Preview Window

• Set Up Page Layout— allows you to change the layout of the data ﬁelds to show more ﬁelds

(with a smaller number size) or less ﬁelds (with a larger number size). See page 29.

Selecting the ‘Setup Highway’

option takes you to the Hiway

tab of the Main Menu.

• Change Numbers— allows you to specify the type of data displayed in each data ﬁeld used on the

map display. For detailed instructions on changing the data ﬁelds and layout of the Highway page, see

pages 30-31.

Active Route Page

When a route is activated in the GPSMAP 178C Sounder system, the Active Route page shows each

waypoint of the active route, along with various, user-selectable types of data. For additional details on

the Active Route Page, see page 64.

Active Route Page

Download from Www.Somanuals.com. All Manuals Search And Download.

Creating and Using Waypoints

Reference

The Garmin GPSMAP 178C stores up to 3000 alphanumeric waypoints with a user-deﬁned icon,

comments, depth, or water temperature available for each waypoint. Waypoints can be created using

three basic methods:

Creating Waypoints

•

ENTER/MARK key– used primarily for marking your present position, the ENTER/MARK key

also provides options that allow you to select a map position or map item from the map display.

Graphically– allows you to deﬁne a new waypoint position from the map display using the

ARROW KEYPAD. (For creating underwater waypoints, see page 37)

Text Entry– allows you to enter a new waypoint’s coordinates manually (from a chart, etc.).

Marking Your Present Position

The Garmin GPSMAP 178C’s ENTER/MARK key lets you quickly capture your present position

(or cursor or map item position) in order to create a new waypoint. You must have a valid position

(2D or 3D) ﬁx to mark your present position. This can be determined by looking at the GPS tab on the

Main Menu.

Highlight ‘OK’ and press ENTER to

use the default name and symbol.

To mark your present position:

1. Press and hold the ENTER/MARK key until the ‘New Waypoint’ window appears, then release it.

You see a default three-digit name and symbol for the new waypoint.

2. To accept the waypoint with the default name and symbol, press ENTER to conﬁrm the highlighted

‘OK’ prompt.

3. To enter a different name, highlight the name ﬁeld and press ENTER, then use the ARROW

KEYPAD to enter the new letters/numbers and press ENTER when done. You may use up to 10

alphanumeric characters for the name.

Highlight a ﬁeld and press ENTER

to enter a new symbol, name, com-

ment or depth.

4. To enter a different symbol, highlight the symbol ﬁeld to the left of the name and press ENTER,

then use the ARROW KEYPAD to highlight the new symbol and press ENTER.

5. To enter optional comments, depth, or water temp, highlight the appropriate ﬁeld and press

ENTER, then use the ARROW KEYPAD to enter a value and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

6. To manually enter a set of coordinates, highlight the coordinates and press ENTER, then use the

ARROW KEYPAD to enter the new coordinates and press ENTER when done.

Reference

7. When done, use the ARROW KEYPAD to highlight the ‘OK’ prompt and press ENTER to save the

Creating Waypoints

waypoint into memory.

Creating Waypoints Graphically

Waypoints may also be quickly created with the Map Page cursor, which allows you to ‘point and

shoot’ at any map position or map feature to create a new waypoint. When you move the cursor over

a map item, you see a highlighted description of that item. The GPSMAP 178C uses the map item text

shown on the cartography as the default name and symbol for the new waypoint.

To create a new waypoint on an open map location:

1. Use the ARROW KEYPAD to move the cursor to the desired map position.

2. Press and quickly release the ENTER/MARK key to capture the cursor position (press and hold

ENTER/MARK to mark your present location, not the map cursor’s position).

Creating a waypoint on

an open map location.

3. The ‘New Map Waypoint’ page appears. To accept the waypoint with the default name and symbol,

press ENTER.

To change the name, symbol, position, or add a comment, depth, or water temp, highlight the

appropriate ﬁeld and press ENTER. Make your changes and press ENTER when done. After enter-

ing and conﬁrming your changes, highlight ‘OK’ and press ENTER.

To create a new waypoint from a map feature:

1. Use the ARROW KEYPAD to move the cursor and highlight the desired map feature.

2. Press ENTER/MARK to capture the cursor position. An Information page for that map feature

appears. Use the ARROW KEYPAD to highlight ‘Create Wpt’ and press ENTER.

3. The ‘New Waypoint’ page appears. To accept the waypoint with the default name and symbol

(based on the map feature), highlight ‘OK’ and press ENTER.

Using a map item to create

a new waypoint.

To change the name, symbol, position, or enter comments, depth, or water temp, highlight the

appropriate ﬁeld and press ENTER. Make your changes and press ENTER. After entering and

conﬁrming your changes, use the ARROW KEYPAD to highlight ‘OK’ and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

Additional Options For Creating Waypoints

Reference

Waypoints may also be created by manually entering position coordinates through the Points tab

of the Main Menu. This method can be useful for creating a waypoint at a speciﬁc latitude/longitude

position from a chart.

Creating Waypoints

To create a new waypoint by entering location coordinates:

1. Press MENU twice to display the Main Menu. Highlight the ‘Points’ tab and press MENU.

2. Highlight ‘Create Waypoint’ and press ENTER. The ‘New Waypoint’ page appears, with the next

available waypoint number and the receiver’s last know position as the default name and position.

3. Use the ARROW KEYPAD to highlight the position ﬁeld and press ENTER. Use the ARROW

KEYPAD to enter the desired position coordinates and press ENTER when ﬁnished.

4. To change the name, symbol, or enter comments, depth, or water temp, highlight the appropriate

ﬁeld and press ENTER. Make your changes and press ENTER when ﬁnished.

Highlight the position ﬁeld and use the

ARROW KEYPAD to enter the desired

position coordinates.

5. Use the ARROW KEYPAD to highlight ‘OK’ and press ENTER to save the waypoint.

A waypoint may also be created by “projecting” the distance and bearing from a speciﬁc location to

a new location. Start by accessing the ‘New Waypoint’ page or the ‘New Map Waypoint’ page.

To create a new waypoint by projecting its location:

1. To project the waypoint from your current location, be sure the ﬁeld to the right of the word ‘From’

reads ‘Current Position’ (if not, highlight the ﬁeld and press ENTER, highlight ‘Current Position’ and

press ENTER).

2. To select a map location from which to project a waypoint, highlight the ﬁeld next to ‘From’ and

press ENTER. The ‘Find’ screen appears. Highlight ‘Other Position’ and press ENTER. Use the zoom

IN key and ARROW KEYPAD to highlight the desired position on the map and press ENTER.

Select a point from which to

project a new waypoint.

Download from Www.Somanuals.com. All Manuals Search And Download.

3. To select another location from which to project a waypoint, highlight the ﬁeld next to ‘From’ and

press ENTER. The ‘Find’ screen appears. Highlight the desired type of location (waypoints, cities,

etc.) and press ENTER. Use the submenus to narrow down your search (for more information see

‘Find’ on page 65). Highlight the desired location and press ENTER. With ‘OK’ highlighted, press

ENTER again.

Reference

Creating Waypoints

4. Highlight the distance and/or bearing ﬁelds below ‘From Current Position’ and press ENTER. Use

the ARROW KEYPAD to enter the projected distance and/or bearing from your current position for

the new waypoint and press ENTER.

5. Make any other desired changes to the new waypoint data (name, symbol, etc.), then highlight ‘OK’

Waypoint Options Menu

and press ENTER to save the waypoint.

Waypoint Menu Options

Two additional options are available by pressing MENU on the New Waypoint and New Map

Waypoint Pages: Append To Route and Move Waypoint. (these menu options also appear on the

Waypoint Edit and Waypoint Review pages).

• Append to Route— Adds the new waypoint to the end of a route.

• Move Waypoint— Allows you to move the waypoint to a new location on the map display.

To append a new waypoint to a route:

1. Select ‘Append To Route’ from the options menu.

2. The ‘Select Route’ screen appears. Highlight the desired route or select ‘New Route’ and press

ENTER.

3. With ‘OK’ highlighted, press ENTER to save the waypoint.

To move a waypoint:

Use the ARROW KEYPAD to move the

waypoint to a new position on the map.

1. Select ‘Move Waypoint’ from the options menu.

2. The selected waypoint is centered and highlighted on a map display. Use the ARROW KEYPAD to

move the waypoint to the new position and press ENTER. Press QUIT to exit.

Download from Www.Somanuals.com. All Manuals Search And Download.

Reviewing and Editing Waypoints

Reference

Once you have created and stored a waypoint, it may be modiﬁed, reviewed, renamed, moved, or

deleted at any time through the Waypoint Review and Waypoint Edit pages.

Reviewing/Editing Waypoints

To access the Waypoint Review page:

1. Use the ARROW KEYPAD to highlight the desired waypoint on the Map Page.

2. Press ENTER to display the Waypoint Review page. If the waypoint is located on a map feature, or

on a MapSource or BlueChart feature, the Waypoint Review page includes additional information

tabs about the other features at that location.

To access the Waypoint Edit page:

1. Press MENU twice to view the Main Menu. Use the ARROW KEYPAD to highlight the ‘Points’ tab,

then highlight the desired waypoint from the ‘User’ or ‘Proximity’ lists.

Waypoint Review Page— Highlight ‘OK’ and

press ENTER to exit/save changes.

2. Press ENTER to display the Waypoint Edit page. If the waypoint is located on a map feature, or

on a MapSource or BlueChart feature, the Waypoint Edit page does NOT display the details of the

other map features.

From the Waypoint Review and Edit pages, you may change the name, symbol, comment, position

coordinates, depth, or water temp for the selected waypoint. Once the changes have been made, high-

light ‘OK’ (Waypoint Review Page) or ‘Next’ (Waypoint Edit Page) and press ENTER to save them.

To change the waypoint name:

1. Highlight the waypoint name ﬁeld and press ENTER.

2. Use the ARROW KEYPAD to enter a new name and press ENTER when done.

To change the waypoint symbol:

Changing a Waypoint symbol.

1. Highlight the waypoint symbol ﬁeld to the left of the waypoint name and press ENTER.

2. Use the ARROW KEYPAD to select the desired symbol and press ENTER when done.

Download from Www.Somanuals.com. All Manuals Search And Download.

To change the comment/position coordinates/depth/water temperature:

Reference

1. Highlight the desired ﬁeld and press ENTER.

Editing Waypoints

2. Use the ARROW KEYPAD to edit/enter the data. To drop to the next line, press to the right on the

ARROW KEYPAD. Press ENTER when done.

On the Waypoint Review and Waypoint Edit pages, you may also delete the selected waypoint,

view the waypoint on the map, and move the waypoint on the map.

To delete a waypoint:

1. On the Waypoint Review/Waypoint Edit page, use the ARROW KEYPAD to highlight ‘Delete’ and

press ENTER.

Symbol

2, With ‘OK’ highlighted, press ENTER again to conﬁrm the deletion.

Name

Depth

To view and move a waypoint on the map:

Comment

1. From the Waypoint Review/Waypoint Edit page, highlight ‘Show Map’ and press ENTER. The

waypoint is highlighted on a map screen with an information window that shows the waypoint

name, position and distance and bearing from your current position.

Water

Temperature

Coordinates

2. To move the waypoint, press ENTER. A ‘MOVE’ label now appears under the cursor arrow. It may

be necessary to use the IN and OUT keys to zoom the map.

Waypoint Edit Page

3. Use the ARROW KEYPAD to move the waypoint to a new position. As you move the cursor around

the map display, the information window at the top changes to show the distance, bearing, and

position of the map cursor (in relation to the waypoint’s original position), and a description of

where the cursor is on the map. If you wish to stop the move process, press QUIT.

4. With the pointer at the desired position, press ENTER. To return to the Waypoint Edit/Waypoint

Review page, press QUIT.

On the ‘Show Map’ map display, an additional option is available by pressing MENU:

•

Point to on Map Page— returns to the highlighted waypoint on the main Map Page (exits the

Waypoint Review/Waypoint Edit Page).

Download from Www.Somanuals.com. All Manuals Search And Download.

Waypoint Lists

Reference

The GPSMAP 178C’s Main Menu Page features two waypoint submenu tabs, ‘User’ and ‘Proxim-

ity’, that let you manage a large number of waypoints quickly and efﬁciently. The submenu tabs also

provide a continuously updated proximity waypoint alarm function that can be used to deﬁne an alarm

circle around submerged hazards, shallow waters, etc.

Waypoint Lists

Submenu Tabs

To access the waypoint submenus of the Main Menu:

1. Press MENU twice, highlight the ‘Points’ tab using the ARROW KEYPAD, then highlight the

desired submenu tab.

User Waypoint List

The ‘User’ submenu of the Points tab displays a master list of all waypoints currently stored in

memory. From the User list, you may review, edit, rename or delete individual waypoints, or delete all

user waypoints. The total number of stored and available waypoints is displayed at the bottom of the

User page, with the stored waypoints arranged in numerical/alphabetical order.

To scroll through and review the waypoint list:

Main Menu—Points Tab

1. With the ARROW KEYPAD, highlight the ‘Points’ tab on the main menu, then highlight ‘User’.

2. Use the ARROW KEYPAD to scroll through the list in the desired direction.

3. Press ENTER to review the highlighted waypoint on the ‘Waypoint Edit’ page (see page 48 for

detailed information on reviewing and editing waypoints).

4. With ‘Next’ highlighted, press ENTER to return to the list. The ﬁeld highlight automatically moves

to the next waypoint in the list.

The following options are available by pressing MENU while highlighting the Points tab, the User

submenu or one of the User waypoint names:

•

Create Waypoint— allows you to create a waypoint. (See page 44)

Delete Waypoint— deletes selected waypoint from list and any route in which it was used.

Delete By Symbol— deletes waypoints that use the same symbol.

Delete All— deletes all waypoints from the unit.

Options Menu

Download from Www.Somanuals.com. All Manuals Search And Download.

Once a waypoint is deleted from the list, it cannot be recovered from the unit. It is

advisable to backup important waypoints to a computer using an optional PC cable

and interface software, save them to a data card, or write them down by hand.

)

Reference

Waypoint Lists

To delete an individual waypoint from the ‘User’ list:

1. Use the ARROW KEYPAD to highlight the waypoint to be deleted.

2. Press MENU, highlight ‘Delete Waypoint’ and press ENTER.

OR, press ENTER, highlight ‘Delete’ and press ENTER.

3. Press the ENTER key to conﬁrm the deletion warning.

To delete waypoints by symbol:

Name

Field

1. From the ‘User’ tab, highlight the waypoint to be deleted and press MENU, then select ‘Delete By

Symbol’ and press ENTER.

Waypoint

List

2. Use the ARROW KEYPAD to highlight the symbol of the waypoint(s) to be deleted and press

ENTER.

3. Press ENTER to conﬁrm. Choose ‘Cancel’ or press QUIT to stop the deletion.

To delete all user waypoints:

You can also search for a waypoint by name:

1. Press the MENU key to select the options window.

1. Highlight the name ﬁeld and press ENTER.

2. Use the ARROW KEYPAD to highlight ‘Delete All’ and then press ENTER.

3. Highlight the ‘OK’ prompt and press ENTER to conﬁrm.

2. Use the ARROW KEYPAD to select the ﬁrst letter of

the name.

3. Move to the RIGHT and enter the second letter if you do

not see it on the list below.

Proximity Waypoint List

4. Repeat this until the name appears. Press ENTER when

you see the name.

The ‘Proximity’ submenu of the Points tab lets you deﬁne an alarm circle around a stored waypoint

position, and can be used to help you avoid reefs, rocks, or restricted waters. Up to ten waypoints may

be listed, with a maximum alarm radius of 99.99 nautical or statute miles or kilometers. If a proximity

alarm circle overlaps with an existing alarm circle, the message ‘Proximity Overlaps Another Proximity

Waypoint’ appears. Since the unit only alerts for one of the overlap points, use caution when navigat-

ing in these areas. If you enter an alarm circle overlap, you are only alerted to the closest proximity

waypoint.

5. Highlight the name on the list and press ENTER again

to review the waypoint. When done, highlight ‘OK’ and

press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

To add a proximity waypoint:

Reference

1. Use the ARROW KEYPAD to highlight an empty space on the Proximity list and press ENTER. The

‘Find’ screen appears. Highlight ‘Waypoints’ and press ENTER.

Waypoint Lists

2. Use the ARROW KEYPAD to highlight the desired waypoint from the ‘By Name’ or ‘Nearest’ tab

lists. The Waypoint Review page appears for the selected waypoint.

3. With ‘OK’ highlighted, press ENTER to conﬁrm. The distance ﬁeld is now highlighted.

4. Press ENTER to begin entry of the proximity radius.

5. Use the ARROW KEYPAD to enter a distance value (to 99.99 units) and press ENTER.

To turn proximity alarms on or off:

1. Use the ARROW KEYPAD to highlight the ﬁeld below “Proximity Alarm” and press ENTER.

2. Select the desired ‘ON’ or ‘OFF’ setting and press ENTER.

Proximity Waypoints List

The following options are available from the ‘Proximity’ submenu of the ‘Points’ tab:

•

Delete Alarm— removes selected waypoint from proximity list.

Delete All— removes all waypoints from proximity list.

To display the waypoint menu options:

Proximity

Waypoint

1. Using the ARROW KEYPAD, highlight the ‘Proximity’ tab and press MENU.

Proximity

Circle

To clear one or all proximity waypoint(s) from the list:

1. Use the ARROW KEYPAD to highlight the proximity waypoint to clear and press MENU.

2. To clear a single alarm, highlight the ‘Delete Alarm’ option and press ENTER.

3. To clear all proximity waypoints, select the ‘Delete All’ option and press ENTER.

4. Use the ARROW KEYPAD to highlight the ‘OK’ prompt and press ENTER to conﬁrm.

A dashed circle appears showing

the alert boundary for the

proximity waypoints.

Download from Www.Somanuals.com. All Manuals Search And Download.

Going to a Destination

Reference

Using the NAV key, the GPSMAP 178C provides three ways to navigate to a destination: Go To

Point, Follow Route, and Follow Track (TracBack). Once you are actively navigating, you see a straight

line that always runs from your current location to the destination on the Map Page. The easiest

method for selecting a destination is the ‘Go To’ function, which lets you select a destination point,

then quickly sets a direct course from your present position. If you highlight a point on a list or the

map and press NAV, ‘Go To <point name>’ appears in addition to ‘Go To Point’. The ‘Go To’ function

can be accessed from any list of points or graphically from the map display.

Going to a Destination

To activate a ‘Go To’ from a point list:

1. Press the NAV key.

2. Use the ARROW KEYPAD to highlight ‘Go To Point’ and press ENTER.

3. From the ‘Find’ menu, highlight ‘Waypoints’ and press ENTER. (You may also choose to go to other

Choose a waypoint from either

the ‘User’ or ‘Nearest’ tab list.

points, such as Cities, Tide Stations, etc. from this list.)

4. Select a waypoint from the ‘By Name’ or ‘Nearest’ list, then press ENTER. To display the Waypoint

Review page for the selected waypoint.

5. With the ‘Go To’ button highlighted, press ENTER to begin navigation.

To stop navigation:

1. Press the NAV key. Use the ARROW KEYPAD to highlight ‘Stop Navigation’ and press ENTER.

Selecting a ‘Go To’ Graphically

A graphical ‘Go To’ may be used to select one of three items from the map display: an existing

waypoint, an on-screen map item (roads, rivers, cities, navaids, etc.), or a new map point (non-map

item). If you select a map item as the ‘Go To’ destination, the GPSMAP 178C automatically uses

the name of the map item, but the point is not stored in the waypoint list (see page 45 for creating

waypoints using map items). If you select a new map point (non-map item) as the ‘Go To’ destination,

the GPSMAP 178C automatically creates or moves a waypoint named ‘MAP’ at the cursor position.

The waypoint or map item name

automatically appears when high-

lighted and NAV is pressed.

Download from Www.Somanuals.com. All Manuals Search And Download.

To activate an existing waypoint or map item as a ‘Go To’ from the map display:

1. Use the ARROW KEYPAD to highlight the waypoint or map item on the screen and press NAV.

2. With ‘Go To <waypoint name>’, press ENTER.

Reference

Going to a Destination/

TracBack Navigation

To activate a new map point (non-map item) as a ‘Go To’ from the map display:

1. Use the ARROW KEYPAD to move the arrow cursor to the desired position and press NAV.

2. With ‘Go To MAP Point’ highlighted, press ENTER.

To stop navigation:

1. Press the NAV key. Use the ARROW KEYPAD to highlight ‘Stop Navigation’ and press ENTER.

TracBack Navigation (Follow Track)

The TracBack function allows you to retrace your path using the track log automatically stored in

the receiver’s memory, which eliminates the need to store waypoints along the way. TracBack routes are

created by reducing your track log into a route of up to 50 turns and activating an inverted route along

those points. Once activated, a TracBack route leads you back to the oldest stored track log point, so it’s

a good idea to clear the existing track log before you start your current trip.

‘Go To MAP Point’ allows you to

navigate to a spot on the map that is

not a waypoint or map item.

To clear the track log and deﬁne a starting point for a TracBack route:

1. Press MENU twice to display the Main Menu page.

2. Using the ARROW KEYPAD, highlight the ‘Track’ tab, then highlight the ‘Active’ tab to the right.

3. Use the ARROW KEYPAD to highlight ‘Erase’ and press ENTER.

4. Highlight ‘OK’ and press ENTER.

You must ﬁrst save the track log before you can use the ‘Follow Track’ feature. The Save feature

allows you to store up to 15 track logs from certain times and dates.

Highlight ‘Save’ and press ENTER

to save an active track log.

To save a track log:

1. From the Main Menu, use the ARROW KEYPAD to highlight the ‘Track’ tab, then highlight the

‘Active’ tab to the right.

Download from Www.Somanuals.com. All Manuals Search And Download.

2. Use the ARROW KEYPAD to select ‘Save’ and press ENTER.

Reference

3. On the ‘Save Back Through’ window, highlight the desired time, date, or ‘Entire Log’ and press

ENTER.

TracBack Navigation

4. Next, the track begins saving and then display the ‘Saved Track’ window when done. The default

name, distance, and number of points (700 maximum) are displayed.

To change the name of the saved track, highlight the name ﬁeld and press ENTER, make your

changes and press ENTER again.

Default Track name

To choose a color that is used to display the saved track line, highlight the ﬁeld and press ENTER,

choose a Color and press ENTER again.

Total Distance

To display the track on the Map and Highway pages, highlight the check box to the left of ‘Show on

Map and Highway’ and press ENTER.

Change color of

track line

To view the track on the map, highlight ‘Review on Map’ and press ENTER. Press QUIT to exit the

Check this box to

display track

Track Map window.

5. Highlight ‘OK’ and press ENTER to save the track.

Total number of points

To activate a TracBack using the NAV key:

1. Press the NAV key, then highlight the ‘Follow Track’ option and press ENTER.

2. Highlight the track you wish to follow and press ENTER.

3. Choose either ‘Original’, which navigates you from the start to the end of your trip, or ‘Reverse’,

which navigates you from the end to the start of your trip and press ENTER.

Once a TracBack has been activated, the GPSMAP 178C takes the track log currently stored in

memory and divides it into segments called ‘legs’. Up to 50 temporary ‘turns’ (BEGIN, TURN 1, TURN

2, TURN 3,...., TURN X, END) are created to mark the most signiﬁcant features of the track log in

order to duplicate your exact path as closely as possible. To get the most out of the TracBack feature,

remember the following tips:

You must ﬁrst save a track before using the ‘Follow

Track’ option. If there are no saved tracks, the message

“There are no saved Tracks to follow” appears after you

select ‘Follow Track.’

•

Always clear the track log at the point that you want to go back to (dock, etc.).

The ‘Record Mode’ option on the track log setup page must be set to ‘Fill’ or ‘Wrap’.

•

There must be at least two track log points stored in memory to create a TracBack route.

Download from Www.Somanuals.com. All Manuals Search And Download.

•

If the track log interval is set to the ‘Time’ option, the route may not follow your exact path

(keep the interval set to ‘resolution’ for best performance).

Reference

TracBack Navigation/

MOB: Man OverBoard

If the receiver is turned off or satellite coverage is lost during your trip, the TracBack draws a

straight line between any point where coverage was lost and where it resumed.

If your track log’s changes in distance and direction are too complex, 50 waypoints may not

mark your path accurately. The receiver then assigns the 50 waypoints to the most signiﬁcant

points of your track, and simpliﬁes segments with fewer changes in direction.

To stop TracBack navigation:

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

For more information on setting up the Track options and saved tracks, see pages 75.

MOB Key

The MOB function allows you to

quickly activate a course back to

a location.

The GPSMAP 178C’s Man OverBoard function (MOB) lets you simultaneously mark and set a

course to a position for quick response to emergency situations.

To activate the MOB function:

1. Press and hold the MOB key for two seconds.

2. Press ENTER to conﬁrm and begin navigating to the MOB position.

Once a MOB has been activated, a ‘MOB’ waypoint with an international MOB symbol is created

and the unit is set on an active navigation to that point. Use any of the Navigation Pages to guide you

back to the MOB point. The MOB waypoint is stored in the waypoint list and may be deleted like any

other waypoint (see page 51).

To stop navigation to the MOB position:

Highlight ‘Stop Navigation’ and

press ENTER to stop navigating.

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

Routes

Reference

The last way to navigate to a destination is to create a user-deﬁned route. The Garmin GPSMAP

178C lets you create and store up to 50 reversible routes (numbered 1-50), with up to 50 waypoints

each. Routes can be created and modiﬁed in two ways. The ﬁrst way is to ‘Edit on Map’ from the Route

Edit map page, allowing you to see each route graphically on-screen as you create, review, or modify

the route. The second way is to ‘Edit as Text’ from the Route Review page, allowing you to see a list of

the waypoints as you create, review, or modify the route. All of the GPSMAP 178C’s route functions are

accessed through the Main Menu page or the NAV key.

Creating a Route

To create a route graphically:

1. Press the MENU key twice to display the Main Menu page. Use the ARROW KEYPAD to highlight

the ‘Route’ tab.

2. Press the MENU key to display the route options page. Select ‘New Route’ and press ENTER.

Or, highlight the ﬁrst available blank slot in the Route List and press ENTER.

Main Menu—Route Tab and

Route Options Menu

3. To add an existing waypoint or map item to the route, use the ARROW KEYPAD to highlight

the desired waypoint or map item on screen and press ENTER. Map items do not appear in the

waypoint list. To create a waypoint from a map item, see page 45.

4. To add a new waypoint to the route, use the map cursor to select the desired map position and

press ENTER. Press ENTER again to conﬁrm the new waypoint. You may also change the name,

symbol and other properties of the new waypoint (see pages 48).

As you add each new waypoint to the route, the data window at the top of the map display shows

the waypoint/map item name, bearing and distance from your location, and coordinates of the

cursor. The bottom of the display shows you the number of available and used points. A route line

appears on the map to indicate each completed leg, and a dotted line appears to indicate the

distance and bearing to the arrow cursor from the last route waypoint.

You see ‘ADD’ below the

cursor as you add points.

5. Repeat steps 3 and 4 until you have ﬁnished deﬁning all route waypoints.

6. When ﬁnished press QUIT twice to return to the Route List page; or press MENU, highlight ‘Edit as

Text’ and press ENTER to return to the Route Review page.

Download from Www.Somanuals.com. All Manuals Search And Download.

To create a route using text from the Route Review page:

Reference

1. Press the MENU key twice to display the Main Menu page. Use the ARROW KEYPAD to highlight

the ‘Route’ tab.

Creating a Route/

Following a Route

2. Press the MENU key to display the route options page. Select the ‘New Route’ option and press

ENTER.

Or, highlight the ﬁrst available blank route slot and press ENTER.

3. Press MENU, select ‘Edit as text’ and press ENTER.

4. Use the ARROW KEYPAD to highlight the ﬁrst ﬁeld under the word “Waypoint” and press

ENTER.

5. From the Find menu, highlight ‘Waypoints’ and press ENTER. (You may also choose from other

points, such as Cities, Tide Stations, etc. from this list.) Select a waypoint from either the “By Name”

or “Nearest” list and press ENTER. (See page 51 for searching for waypoints by name.)

Choose the type of point you

want to add to the route.

6. On the Point Review or Waypoint Review page, ‘OK’ is automatically highlighted. Choose ‘Show

Map’ and press ENTER to view the point on the map, then press QUIT to return to the Waypoint/

Point Review page. With ‘OK’ highlighted, press ENTER to add the point to the route.

7. Repeat steps 4-6 until the desired route points have been entered. Press QUIT to return to the

Route List page.

Following a Route

Once a route has been created, it can be activated and used for navigation with the NAV key. A

route may be followed in the same sequence as it was originally created, or inverted and followed from

the end point back to the beginning point.

To activate and follow a route:

Choose a waypoint from either

the ‘By Name’ or ‘Nearest’

tab list.

1. From any page, press the NAV key, then using the ARROW KEYPAD, highlight ‘Follow Route’ and

press ENTER. (If you highlight a route from the Route List or Route Review page and press NAV,

the window automatically displays, ‘Follow <the route name>’.)

Download from Www.Somanuals.com. All Manuals Search And Download.

2. Highlight the route you wish to navigate and press ENTER.

Reference

3. Choose ‘Activate’ or ‘Invert and Activate’ and press ENTER. (‘Activate’ uses the route as is, ‘Invert

and Activate’ reverses the route then activate it.)

Route List Page

To deactivate (stop navigation) of a route:

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

Route List Page

The GPSMAP 178C Route List page (‘Route’ tab of the Main Menu) displays all the routes currently

stored in memory, along with a descriptive name for each route. By pressing MENU while on the Route

List page, the following menu options appear: ‘New Route’ (page 57), ‘Copy Route’, ‘Delete Route’, or

‘Delete All’.

To select and follow a route:

If you highlight a route name from

the Route List and press NAV, the

name automatically appears.

1. On the Route List page, use the ARROW KEYPAD to highlight the desired route and press NAV.

2. With ‘Follow <route name>’ highlighted, press ENTER. Highlight ‘Activate’ or ‘Invert and

activate’ and press ENTER.

To deactivate (stop following) the route:

1. Press the NAV key, highlight ‘Stop Navigation’ and press ENTER.

To copy or delete a route:

1. From the Route List, using the ARROW KEYPAD, highlight the route you want to copy or delete

and press MENU.

2. Choose either ‘Copy Route’ or ‘Delete Route’ and press ENTER and with ‘OK’ highlighted, press

ENTER again to conﬁrm a deletion. Copy uses the same route name with an additional number,

starting at 1, at the end of the route name.

Route List Options Menu

To delete all routes:

1. From the Route List, press MENU.

2. Highlight ‘Delete All’ and press ENTER. With ‘OK highlighted, press ENTER again to conﬁrm.

Download from Www.Somanuals.com. All Manuals Search And Download.

Route Review Page

Reference

Once you have created a route, the Route Review page allows you to edit a selected route.

To access the Route Review page:

Route Review Page

1. Press MENU twice and highlight the ‘Route’ tab.

2. Highlight the name of the route you wish to review and press ENTER.

Route Name

The Route Review page also allows you to enter a 15-character name for any listed route. By

default the name includes the ﬁrst and last waypoints in the route.

Data Fields

To enter a custom route name:

1. From the Route Review page, highlight the name ﬁeld and press ENTER to begin editing.

2. Use the ARROW KEYPAD to enter the desired name and press ENTER when ﬁnished.

Route Points

Data Totals

Once you are on the Route Review page, you may review the route points (waypoints or map

items) one at a time from the list.

To review individual route points:

1. Highlight the desired point and press ENTER.

2. On the Point Review window, you may choose ‘Next’ (highlight the next point on the route list),

‘Show Map’ (show the point on a map window), or ‘Delete’ (permanently delete the waypoint from

the unit) and press ENTER. If the route point is a user waypoint, you may edit any of the waypoint

properties on the Waypoint Review page (see pages 48 for details).

Once you are back on the Route Point List, the next point in the route is automatically highlighted.

This allows you to review each point on the route by repeatedly pressing ENTER.

Route Review Options Menu

Route Review

Options Menu

By pressing MENU on the Route Review page, the following options are available: Edit on Map,

Add Before, Remove, and Trip Planning.

Download from Www.Somanuals.com. All Manuals Search And Download.

• Edit on Map — review and modify the route displayed for each point (waypoint or map item)

on a map page. You may also use the cursor to insert a new route point on a route leg, review the

waypoint or map item.

Reference

Editing Routes

To edit a route on the map:

1. From the Route Review page, press MENU, highlight ‘Edit on Map’ and press ENTER.

To review a route point:

1. Highlight the point and press ENTER. The Review page appears. Highlight ‘Next’ and press ENTER

to return to the map with the next route point highlighted.

To edit a route point:

1. Use the ARROW KEYPAD to highlight the desired route waypoint and press MENU.

A pop-up menu of editing choices appears, with the following options: Edit as Text (return to the

Route Review page), Remove, Move (user waypoints only), and Add.

Highlight a route point and

press ENTER to review it.

To remove a route waypoint:

1. Highlight the ‘Remove’ option and press ENTER.

To move a route waypoint:

1. Highlight the ‘Move’ option and press ENTER.

2. Move the cursor to the new map position and press ENTER.

To add points to the beginning or end of the route:

1. With the map cursor, select the ﬁrst route waypoint (to add waypoints to the beginning of the

route) or last (to add waypoints to the end of the route) and press MENU.

2. Highlight the ‘Add’ option and press ENTER.

3. Move the cursor to the new point or position and press ENTER.

4. If you are not adding an existing waypoint, press ENTER to conﬁrm the new waypoint.

5. Repeat steps 3 and 4 to add additional waypoints or press QUIT to ﬁnish.

Choose ‘Next’ to center the map on the next

point in the route. You can step through the

points by repeatedly pressing ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

The GPSMAP 178C’s route edit mode also allows you to insert a new route point in any route leg

using the map cursor.

Reference

To insert a new point between two existing route waypoints:

Editing Routes

1. Use the ARROW KEYPAD to select the leg in which you want to insert the new waypoint (the

route line highlights and changes to a dotted line when the leg is selected) and press ENTER.

2. Move the cursor to the new map position, existing waypoint, or map item (You see ’ADD’ below the

arrow and the route lines moves with the arrow) and press ENTER.

3. If you are not inserting an existing point, press ENTER to conﬁrm the new waypoint.

4. Press QUIT to return to the Route Review page.

• Add Before — Insert a waypoint into the route points list.

To insert a point into the route:

Highlight the route leg on which

you wish to insert a waypoint and

press ENTER.

1. From either the Route Review or Active Route pages, use the ARROW KEYPAD to highlight the

point you wish to insert the new point before and press MENU.

2. Highlight ‘Add Before’ and press ENTER.

3. From the ‘Find’ menu, highlight ‘Waypoints’ and press ENTER. (You may also choose from other

points, such as Cities, Tide Stations, etc. from this list.) Select the point you want and press ENTER

twice. (See page 51 for searching for waypoints by name.)

• Remove — Remove a point (waypoint or map item) from a route. This option is available from

both the Route Review and Active Route Pages.

To remove a point from a route:

1. From either the Route Review or Active Route pages, use the ARROW KEYPAD to highlight the

point to remove and press MENU.

Drag the route leg to an existing

waypoint, map item, or an open spot

on the map (shown) to create a new

route point.

2. Highlight ‘Remove’ and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

• Trip Planning — The Route Review and Active Route pages also display trip-planning information

for each leg or the entire route. Available information includes Course, ETA, Fuel (to point), Leg

Distance, Leg Fuel, Leg Time, Sunrise and Sunset (at point location) and Time To (point).

Reference

Editing Routes

To use the trip planning feature:

1. Highlight the desired route from the Route List and press ENTER to display the Route Review page.

2. One of nine available planning ﬁgures appears to the right of each route waypoint and its distance.

Use the LEFT/RIGHT keys on the ARROW KEYPAD to select the desired item.

3. To enter planning information (from the Route Review Page only), press MENU and select ‘Trip

Planning’ from the options list. Enter the ﬁgures for Speed, Fuel Flow, Departure Time, and

Departure Date.

4. Press QUIT to return to the Route Review Page.

Press LEFT or RIGHT on the

ARROW KEYPAD to change

the data ﬁeld.

NOTE: Fuel ﬂow rates on your unit are measured in “units per hour”. System setting

changes for units of measure (statute, nautical or metric) do not affect the fuel ﬂow

measure. You should enter fuel ﬂow rates based upon available information for your

vehicle (operator’s manual, performance speciﬁcations, etc.) and make note of the

desired units of measure (gallons, liters, etc.).

)

Trip Planning Data Fields

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

Active Route Page

Whenever you have activated a route in the GPSMAP 178C, the Active Route page shows each

point (waypoint or map item) of the active route, with the point name, distance and choice of Course,

ETA, Fuel to point, Leg Distance, Leg Fuel, Leg Time, Sunrise and Sunset at point location, or Time

To point for each point from your present position. The current destination point, the ‘active’ point, is

marked with an arrow icon. As you navigate a route, the point list automatically updates to indicate the

next ‘active’ point ﬁrst. The Active Route and Route Review pages share many of the same features and

options.

Active Route Page

Active Route Page Options

The following options are available by pressing MENU on the Active Route page:

• Edit on Map — see page 61 for instructions.

• Add Before — see page 62 for instructions.

• Remove — see page 62 for instructions.

• Invert — reverses the direction of the route.

To invert an active route:

Active Route Page

From the Active Route page, press MENU.

2. Using the ARROW KEYPAD, highlight ‘Invert’ and press ENTER to reverse the route.

• Re-evaluate — recalculates and reactivates the current route data. Selects the route leg clos-

est to your current position as the active leg (the active leg deﬁnes the current ‘from’ and ‘to’

waypoints).

To re-evaluate an active route:

Active Route Page Menu Options

From the Active Route page, press MENU.

2. Using the ARROW KEYPAD, highlight ‘Re-evaluate’ and press ENTER to recalculate.

Download from Www.Somanuals.com. All Manuals Search And Download.

Find Key

Reference

The FIND key allows you to search the unit for user waypoints, map items, and any optional

BlueChart or MapSource information loaded on a data card. Press the FIND key to search for items

from your current location by default. You may also search from other locations. When you press

FIND, a list of available items to search for appears. The default items are Waypoints, Cities, Tide Sta-

tions, and Transportation. Additional items, such as Anchorages, Businesses, Exits, Navaids, Restricted

Areas, Wrecks, Obstructions, etc., are displayed depending on the optional BlueChart or MapSource

data card inserted into the unit. If you pan around on the Map Page and press FIND, the unit centers

its search from the point where the cursor is located. When using BlueChart or MapSource data, your

position or the map pointer must be within the map outline area to search for information from that

area.

Find Key

To ﬁnd a waypoint or other item from your current location:

Find Items List From the Cur-

rent Location

From any page, press FIND.

2. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER.

3. For Waypoints and Cities, you may search using ‘By Name’ or’ Nearest’. Use the ARROW KEYPAD

to highlight the desired tab. For ‘By Name’, you may use the top ﬁeld to spell out the name or scroll

down through the list.

To ﬁnd a waypoint or item from another location:

1. Once the search results list is displayed for a particular item, press MENU.

2. Highlight ‘Nearest to Other’ and press ENTER. If you are actively following a route, you may also

choose ‘Nearest to Next’ or ‘Nearest to Destination’.

3. Select a reference point on the map and press ENTER. The search results list changes to list items

nearest to the new map position.

You may also start a ‘Find’ from

items found on the Find List or

from another location on the map.

To ﬁnd a waypoint or item from another location on the map:

From the Map Page, use the ARROW KEYPAD to pan to the desired location and press FIND.

2. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

To view details about an item:

Reference

1. With the desired item highlighted in the search results list, press ENTER.

2. An Information page appears with details about the item organized in a tabbed format. Depending

on the type of item, additional options are available for viewing the item on the map, viewing notes

on a MapSource or BlueChart map, viewing a tide chart, viewing a list of maps on your data card,

and viewing the next item in the search results list.

Find Options

Additional Information

Tabs

The Find option supports a “ﬁnd from” feature, which allows you to center your search around an

item that you have just found. For example, you search for “Restricted Areas” and the search shows an

“Anchoring Prohibited” search result. If you press FIND again, you see “From Anchoring Prohibited” as

the new search from point. You may also use the Find feature to center your search from any waypoint,

route list entry, map item or tide station. Highlight the item you want to Find ‘from’, and press the

FIND key.

Distance, Bearing,

Coordinates of item

Additional Option

Buttons

Additional Information Window

Find Options

Using the Find options, you may search from various map data and utilize variety of nearest

criteria for all items, except waypoints. Available Find options are:

•

Nearest To Boat— centers search from your boat’s current location

Nearest To Other— allows you to choose another map location from which to search.

Nearest To Next— centers search from the next point of your active route.

Nearest To Destination— centers search from the last point of your active route.

To ﬁnd an item using the ﬁnd options:

From any page, press FIND.

2. Using the ARROW KEYPAD, highlight the desired category from the list and press ENTER.

From the search results list, press MENU, then highlight the desired option and press ENTER.

Find Menu Options

Download from Www.Somanuals.com. All Manuals Search And Download.

Main Menu Page

Reference

The GPSMAP 178C’s Main Menu Page provides access to various waypoint, system, navigation and

interface management, and setup menus in an easy to use “tab” format. The Main Menu page is avail-

able from any page in the GPSMAP 178C’s system, and is accessed through the MENU key. See pages

2-3 for additional instructions changing settings and entering data.

Main Menu Page

To access the Main Menu Page:

1. Press MENU twice. The 16 Menu tabs are divided into categories by function.

To select a Menu tab from the Main Menu page:

Submenu Tabs

1. Move the ARROW KEYPAD UP or DOWN to highlight the tab you want to view. The information

for the highlighted tab automatically appears to the right. If you want to highlight any of the tab

items, press to the RIGHT on the ARROW KEYPAD, then move UP or DOWN to select individual

items.

Main

Tabs

2. Press either MENU for additional submenu options or press ENTER/MARK to make changes to the

highlighted item. Press LEFT on the ARROW KEYPAD to get back to the Menu tab list. Press QUIT

to return to the Main Menu page.

The Main Menu tabs are:

•

GPS – shows satellite status, accuracy, initialize position.

Tide – shows 24 hour tide chart with levels and times.

Trip – provides trip speeds, odometers, averages, and trip timers.

Celes – shows sun/moon time cycles and positions.

Points – allows you to create, edit or delete waypoints. See page 44.

Route – allows you to create, edit, activate or delete routes. See page 57.

Track – lets you record a track, deﬁne how it is recorded and displayed.

DSC— allows you to control the Digital Selective Calling (DSC) interface.

Card – interface control for saving waypoints, routes and tracks to a data card.

Map – sets up Map Page features, zooms, and text size. See page 25.

Main Menu Page

Hiway – sets up Highway Page features. See page 43.

(continued)

Download from Www.Somanuals.com. All Manuals Search And Download.

•

Temp – sets up and shows the water temperature log.

Sonar – sets up Sonar Page features, speeds and calibrations. See pages 39.

Setup – deﬁnes System, Units, and Time settings.

Comm – interface settings for use with a PC or second device.

Alarm – sets up alarms for anchor drag, arrival, off course, and clock.

Reference

Main Menu: GPS Tab

GPS Tab— provides a visual reference of satellite acquisition, receiver status, and accuracy. The status

information gives you an idea of what the receiver is doing at any given moment. The sky view and

signal strength bars give you an indication of what satellites are visible to the receiver and whether or

not they are being tracked. The signal strength is shown on a bar graph for each satellite, with the satel-

lite number below. As the receiver locks onto satellites, a signal strength bar appears for each satellite in

view. The progress of satellite acquisition is shown in three stages:

Receiver

Status

Differential

Status

Accuracy

Sky View

•

No signal strength bars— the receiver is looking for the satellites indicated.

Signal

Strength

Bars

Light/White signal strength bars— the receiver has found the satellite(s) and is collecting data.

Dark/Green signal strength bars— the receiver has collected the necessary data and the

satellite(s) are ready for use.

Main Menu— GPS Tab

As soon as the GPSMAP 178C has collected the necessary data from the best satellites in view to

calculate a ﬁx, the status ﬁeld indicates a 2D or 3D status. The unit then updates the position, date and

time.

Center dot - 90°

above the horizon

90°

You can use the sky view to help determine if any satellites are being blocked, and whether you

have a current position ﬁx (indicated by a ‘2D’,‘2D Differential’,‘3D’, or ‘3D Differential’ in the status

ﬁeld). The sky view shows a bird’s-eye view of the position of each satellite relative to the receiver’s

last known position. The outer circle represents the horizon (north up), the inner circle 45º above the

horizon, and the center point a position directly overhead. You can also set the sky view to a ‘Track Up’

conﬁguration, causing the top of the sky view to align along your current track heading.

Inner ring- 45°

above the horizon

Outer ring

the horizon

45°

Download from Www.Somanuals.com. All Manuals Search And Download.

WAAS Capability

Reference

The GPSMAP 178C is capable of receiving WAAS (Wide Area Augmentation System) satellite sig-

nals. WAAS is an FAA (Federal Aviation Administration) funded project to improve the overall accuracy

and integrity of the GPS signal for aviation use, but land/sea based users may also beneﬁt from this

system. At this time, the system is still in the development stage and is not fully operational. There are

currently two WAAS satellites that can be received in the U.S.A., one over the Atlantic Ocean and one

over the Paciﬁc Ocean, in a geo-stationary orbit over the equator. Effective use of the WAAS satellite

signal may be limited by your geographic location in relation to those satellites, now in developmental

service. WAAS satellite signal reception requires an absolute clear view of the sky and works best when

there are no nearby obstructions such as buildings, mountains, etc. WAAS satellites are numbered 33

or higher when viewing the sky view on your GPSMAP 178C. Initial reception of the WAAS signal may

take up to 15-20 minutes, then 1-2 minutes afterwards. When WAAS differential correction has been

received for GPS satellites (numbers 32 or below), a ‘D’ appears in the signal bar of the sky view and

‘2D or 3D Differential’ appears in the receiver status. To learn more about the WAAS system, its satellite

positions and current state of development, visit the FAA web site (http://gps.faa.gov). Since WAAS

requires CPU resources of the GPSMAP 178C to search for and track the satellites, you may disable the

WAAS feature to improve unit performance if WAAS reception is not available in your area.

Main Menu: GPS Tab

Highlight ‘WAAS Off’ and press ENTER

to disable the WAAS capabilities.

To disable/enable WAAS capability:

1. From the GPS tab, press MENU, then use the ARROW KEYPAD to highlight ‘WAAS Off’ or ‘WAAS

On’ and press ENTER.

Receiver Status and Accuracy

Receiver status is indicated at the top ﬁeld of the page, with the current Accuracy and Dilution Of

Precision (DOP) to the right of the sky view. Accuracy uses DOP and other factors to calculate horizon-

tal position accuracy in feet or meters.

Download from Www.Somanuals.com. All Manuals Search And Download.

The status ﬁeld shows one of the following conditions:

Reference

•

Looking For Satellites – the receiver is looking for any satellites.

AutoLocate – the receiver is looking for any satellite whose almanac has been collected. This

process can take up to ﬁve minutes.

Main Menu: GPS Tab

•

Acquiring Satellites – the receiver is looking for and collecting data from satellites visible at its last

known or initialized position, but has not collected enough data to calculate a ﬁx.

2D – at least three satellites with good geometry have been acquired and a 2 dimensional position

ﬁx (latitude and longitude) is being calculated. ‘2D Differential’ appears when you are receiving

DGPS corrections in 2D mode and a ‘D’ shows on the strength bar of satellites being corrected.

•

3D – at least four satellites with good geometry have been acquired and your position is now being

calculated in latitude, longitude and elevation. ‘3D Differential’ appears when you are receiving

DGPS corrections in 3D mode and a ‘D’ shows on the strength bar of satellites being corrected.

•

Poor GPS Coverage – the receiver is no longer tracking enough satellites for a 2D or 3D ﬁx.

Receiver Not Usable – the receiver is unusable, possibly due to interference or abnormal satellite

conditions. Turn the unit off and back on to reset.

When the GPSMAP 178C is using a differential

correction signal (either WAAS or DGPS), a “D”

is displayed at the bottom of the signal strength

indicator bars for the satellites that are corrected.

•

Simulating – the receiver is in simulator mode.

The Differential Receiver status shows one of the following:

•

Off – No optional beacon receiver attached or enabled in the Comm menu or WAAS Off

Searching For WAAS – WAAS is enabled and receiver is searching for WAAS signal

Using WAAS – WAAS capability enabled and unit receiving WAAS corrections

No Beacon Signal – DGPS receiver attached, but not transmitting RTCM data to GPS

Tuning Beacon – Receiver is tuning manual DGPS frequency

Receiving Beacon – Unit is receiving DGPS corrections

Scanning Beacon – DGPS receiver is scanning for available frequency

Using DGPS – Indicates a Differential signal is being received (only displays when the Serial Data

Format is set to “Other DGPS” on the Comm Tab of the Main Menu).

Download from Www.Somanuals.com. All Manuals Search And Download.

The Differential SNR (Signal to Noise Ratio) indicates, on a scale to 0-30db with 30db being the

best, the strength of the DGPS signal being received. The SNR depends upon the mounting of your

DGPS receiver and the distance from the DGPS transmitting station.

Reference

Main Menu: GPS Tab

The GPS Info tab features an options menu that provides access to functions and features relating

to the GPS Info display.

The following options are available by pressing MENU on the GPS Info Tab of the Main Menu:

• Start/Stop Simulator— toggles the unit simulator on or off. Retail Demo mode restores factory

settings to the unit if left unattended for over two minutes. This mode should only be used for

display purposes. User waypoints are NOT deleted.

• WAAS On/WAAS Off— toggles the WAAS capability of the receiver on or off.

• Track Up/North Up— allows you to select between a north up or track up sky view display for

the GPS Info display only.

• AutoLocate— allows the receiver to locate your position automatically. This process can take up

to ﬁve minutes.

• Initialize Position— allows you to initialize the receiver graphically on the Map Page to initially

GPS Tab Options Menu

help the receiver acquire more quickly. See page 4 for instructions on initialization.

• Set 2D Elevation— allows you to manually enter the elevation when in 2D or Simulator mode

only. Any elevation entered is automatically calculated when the GPS is in 3D mode.

To select a menu option:

1. Using the ARROW KEYPAD, highlight the desired option and press ENTER.

NOTE: If a DGPS receiver is attached to the unit and Garmin DGPS, RTCM In/NMEA

Out, or Other DGPS is enable on Port 2, WAAS is automatically disabled (WAAS Off).

It is not possible for the GPSMAP 178C to receive WAAS and DGPS corrections at the

same time.

)

Download from Www.Somanuals.com. All Manuals Search And Download.

Tide Tab— shows a graphical chart that displays tide station information in a 24-hour span starting at

midnight station time. You can choose from different dates and over 3000 tide stations around the USA

coastline, Alaska, Hawaii, western Canada and several of the Caribbean islands.

Reference

The top of the page displays the tide station being referenced, below that the date. The top of the

chart shows a 24-hour block of local time (LCL) for your position, with the reported station time (STA)

appearing at the bottom. Daylight (light/yellow bar) and nighttime (dark/blue bar) show across the time

scale, with the time progressing from left to right. (Local time scales and day/night info may not be avail-

able for a few stations). The solid, light vertical lines are in 4-hour increments, and the light, dotted verti-

cal lines are in 1-hour increments. A solid, vertical line (with the current time box at the top) indicates

the time of day when using current date and intersects the tide graph to show their relation.

Station Name

Date

Tide Chart

Event Times

Local Time

Max. Level

Current Time Bar

Current Tide Height Bar

Low Tide Curve

Main Menu—Tide Tab

High Tide Curve

Min. Level

Day

Station Time

Night

The tide curve shows as a shaded area, with higher tides being taller and lower tides shorter. The

solid, horizontal line (with the current tide box on the left) indicates the current tide height. The ﬁgure

to the left of the line shows the current tide level in feet. The Mean Lower Low Water (MLLW) appears as

a solid, horizontal line on the chart (This line only appears if the tide ranges to the zero value or below).

The numbers directly below/above ‘LCL’ and ‘STA’ indicate the maximum/minimum levels, respectively.

The four data ﬁelds below the chart, indicate event times and levels at which the tide changes. When

comparing with other tide tables, be sure the the depth unit value is the same for both sources.

You can select from a list of

nearest stations.

Download from Www.Somanuals.com. All Manuals Search And Download.

To select the nearest tide station from you current location:

1. From the “Tide” tab, highlight the ‘At’ ﬁeld and press ENTER.

2. Highlight the desired station of the list and press ENTER twice.

Reference

Main Menu: Tide Tab

If you are not within this range, you see a message “None Found”. Use the ‘Nearest To Other’ Find

option and select a location closer to a tide station.

To select a tide station from the map:

1. Press FIND, then MENU when the search results appear.

2. Highlight ‘Nearest To Other’ and press ENTER.

3. Select a position on the map and press ENTER.

Tide Station List Menu Options

Press MENU on the Tide Station list to access additional

search options. The ‘Nearest to Next’ and ‘Nearest to Desti-

nation’ options are enabled when you are actively going to a

destination (following a Go To or a Route, for example). You

must select a location within 100 nm. of a tide station.

4. A list appears showing up to nine of the nearest tide stations. Highlight the desired station and

press ENTER twice If the “None Found” message appears, repeat steps 1-4 until you ﬁnd a station.

You may also change the date to see tide charts for other days.

To change the date for the tide chart:

1. Using the ARROW KEYPAD, highlight the “On” ﬁeld and press ENTER.

2. Enter the desired date and press ENTER.

To use the current date:

1. Press MENU, then highlight ‘Use Today’s Date’ and press ENTER.

You may move the time bar on the tide chart in 5 minute increments to show tide heights at vari-

ous times on the chart.

To see tide heights at various times on the chart:

1. Press MENU, then highlight ‘Move Cursor’ and press ENTER. (Or highlight the chart ﬁeld.)

You may move the cursor to see tide heights at dif-

ferent times. Tide data shows in a black box when

in cursor mode.

2. Press LEFT or RIGHT on the ARROW KEYPAD to change the time and day. Press QUIT when done

or press MENU, then highlight ‘Stop Moving Cursor’ and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

Trip Tab— displays Trip Odometer, Moving Average Speed, Total Average Speed, Maximum Speed,

Stopped Time, Moving Time, Total Time, and Odometer.

Reference

To reset the trip data:

Main Menu: Trip Tab/

Celestial Tab

1. Highlight ‘Reset Trip’, ‘Reset Max Speed’, ‘Reset Odometer’ or ‘Reset All’ and press ENTER.

Celes (Celestial) Tab— displays celestial data for sun and moon rise/set, moon phase, and approxi-

mate skyview location of the sun and moon. The moon phase displays the current visible portion of the

moon as a light color. You may display this data for your current position, a position from the map, or

a Find item location. Also, you may select a different date and time, or use the current data.

To choose another position:

1. From the Celestial tab, highlight the ‘At’ ﬁeld and press ENTER.

2. The Find menu appears. Make a selection and press ENTER until the information for that location

is displayed on the Celestial tab. See pages 65-67 for more information on using the Find feature.

List highlight any category, except Other Location, and press ENTER. If you wish to reference a Find

item, select from the Find list, and press ENTER.

Main Menu— Trip Tab

Date/Time

The location the unit is using appears in the ‘At’ ﬁeld. The timetables displayed is based upon your

current time zone. You may change your time zone to view times from another zone. Keep in mind this

changes the time settings for the entire unit. (see page 77).

Position

Sun/Moon

Skyview

Window

Event Times

To change the time or date:

1. From the Celestial tab, use the ARROW KEYPAD to highlight the date or time ﬁeld and press

ENTER.

Moon

Phase

Sun

Position

2. Enter a new date or time and press ENTER.

3. To return to the current date and time, press MENU, use the ARROW KEYPAD to highlight ‘Use

Current Date and Time’ and press ENTER.

To change the skyview orientation:

Overhead (90°) 45°

20°

Horizon (0°)

1. From the Celestial tab, press MENU, then use the ARROW KEYPAD to highlight ‘North Up’ or

‘Track Up’ and press ENTER.

Main Menu— Celestial Tab

Download from Www.Somanuals.com. All Manuals Search And Download.

Points Tab— contains the ‘User’ and ‘Proximity’ waypoint lists. See page 50.

Route Tab— contains a list of available routes. See page 59.

Reference

Track Tab— lets you specify whether or not to record a track log (an electronic ‘breadcrumb trail’

recording of your path), deﬁne how it is recorded, or save track log data for future use. The Track Tab

also provides an indicator of the memory used for the active track log and options to clear the track

memory or start a TracBack route. See page 54 for TracBack information. The Track submenu is divided

in two tabs: ‘Active’ tab and the ‘Saved’ tab.

Main Menu: Track Tab

Active Submenu Tab— is for the active log (the log currently being recorded). It displays track

memory used and current settings. For the ‘Active’ tab, the following settings are available:

• Record Mode— lets you select one of three track recording options:

Off— No track log is recorded. Note that selecting the ‘Off’ setting prevents you from using

the TracBack feature.

Fill— a track log is recorded until the track memory is full.

Main Menu— Active Track

Tab

Wrap— A track log is continuously recorded, wrapping through the available memory

(replacing the oldest track data with new data).

• Color— lets you choose a color that is used to display the active track log.

• Interval— deﬁnes the frequency at which the track plot is recorded. Three interval settings are

available:

Distance— records track based on a user-deﬁned distance between points.

Time— records track plot based on a user-deﬁned time interval.

Resolution— records track plot based upon a user-deﬁned variance from your course over

ground. The resolution option is the default setting and is recommended for the most

efﬁcient use of memory and TracBack performance. The distance value (entered in the value

ﬁeld) is the maximum error allowed from the true course before recording a track point.

Main Menu— Saved Track

Tab

• Value— deﬁnes the distance or time used to record the track log.

• Save— allows you to save the current active track log.

• Erase— allows you to clear the active track log currently stored in memory.

Download from Www.Somanuals.com. All Manuals Search And Download.

Saved Submenu Tab— manages a list of any saved track logs, allows TracBack activation, map display

of saved logs. The active log stores up to approximately 10,000 track log points, based upon the criteria

speciﬁed in the Track settings. Up to 15 track logs may be saved in memory, with up to 700 track log

points in each saved log.

Reference

Main Menu: Track Tab

On the ‘Saved’ tab, the following options are available by highlighting a track and pressing MENU:

•

Review On Map – displays the saved track log on a Track Map page.

Delete Track – deletes highlighted saved track log from memory.

Delete All – deletes all saved track logs from memory.

To review and edit a track:

1. On the ‘Saved’ Track tab of the Main Menu, highlight the desired track and press ENTER. The Saved

Track window appears.

Reviewing a saved track

2. You may rename the track, choose to show the track on the Map and Highway pages, delete the

track, or view the track on a map window.

3. To exit, press QUIT or highlight ‘Next’ and press ENTER.

You may also activate a TracBack from any of the saved tracks on this tab.

To activate a TracBack from the ‘Saved’ tab list:

1. Using the ARROW KEYPAD, highlight the track you wish to use for a TracBack and press NAV.

2. The ‘Follow <track name>’ automatically appears highlighted. Press ENTER.

3. Choose either ‘Original’, which navigates you from the end to the start of your trip, or ‘Reverse’,

which navigates you from the start to the end of your trip and press ENTER.

The track name automatically appears when

highlighted on the ‘Saved’ list and NAV is

pressed.

Download from Www.Somanuals.com. All Manuals Search And Download.

DSC Tab— allows to control and set up DSC (Digital Selective Calling) features on the unit.

Reference

What is Digital selective calling (DSC)?

Main Menu: DSC Tab

Digital Selective Calling (DSC) uses marine VHF radio and Global Positioning System (GPS) tech-

nologies to transmit and receive location information. DSC is used by mariners to assist them in two

major areas: Distress Calls and Position Reporting.

An emergency DSC Distress Call allows a vessel in trouble to transmit a substantial amount of infor-

mation in a single transmission or “call,” without the need for voice communication. When any nearby

rescuer receives the DSC signal, an alarm sounds and they immediately receive the position of the caller.

The rescuer may then choose to navigate (Go To) the caller’s position to assist or forward the call on

to the Coast Guard. When the Coast Guard receives the call, they can immediately access the caller’s

information (such as who they are and the type of vessel) in their database while they are in transit to

the caller’s position.

A non-emergency DSC Position Report allows mariners to exchange and display the positions of

one another. Once a DSC position is received, the mariner may choose to create a waypoint or to show

the received position on an electronic map.

Any time a vessel receives a DSC call, they can store that location and quickly navigate to that

position using a Go To. This makes DSC a time-saver, especially in an emergency situation. In order to

use DSC, users must ﬁrst register their VHF radio with the FCC and receive a Maritime Mobile Service

Identity (MMSI) number.

DSC Tab

What is A Maritime mobile service identity (MMSI)?

Maritime Mobile Service Identity (MMSI) basically allows a VHF radio to act like a phone. In order

to make a “call” on a phone, you ﬁrst need a phone number to dial. The 9-digit MMSI number acts

like a phone number when used in a Position Report and as a unique identiﬁer to the Coast Guard

when used in an emergency Distress Call. In order to obtain a Maritime Mobile Service Identity (MMSI)

number, users must register their VHF radio with the FCC (Form 605). Garmin does not supply this

number!

Download from Www.Somanuals.com. All Manuals Search And Download.

HOW ARE MMSI ASSIGNMENTS OBTAINED?

Reference

Non-commercial users (e.g. recreational users who remain in domestic waters and only carry VHF,

EPIRB (Emergency Position Indicating Radio Beacons), and Radar) are not required to have a FCC

ship station license. The FCC and Coast Guard have authorized some second and third party vendors

to assign MMSI numbers. This service is limited to registering recreational vessels only. To receive

information on how to obtain a recreational MMSI number please contact: http://www.uscg.mil/

rescue21/links/mmsi.htm or http://wireless.fcc.gov/marine/.

Main Menu: DSC Tab

U.S Non-Federal User: Commercial users, or those who travel outside the U.S. or Canada, must

apply for a ship station license, or an amendment to a ship station license. To ﬁnd out if you require

a Ship Station license contact: http://wireless.fcc.gov/marine/fctsht14.html. If your vessel requires

licensing by the FCC you will obtain a MMSI during the application/licensing process when you ﬁle

FCC Forms 159 and 605.

U.S. Federal User: Federal users can obtain MMSI assignments from their agency radio spectrum

management ofﬁce. These procedures are currently under review by the NTIA (National Telecommuni-

cations and Information Administration).

Outside the U.S.: Users can obtain an MMSI assignment from their telecommunications authority

or ship registry, often by obtaining or amending their ship station license.

In Canada: Industry Canada is responsible for assigning MMSI numbers to commercial and

recreational vessels. Information is available at the following web site: http://apollo.ic.gc.ca/english/

mmsi.html.

For more information regarding MMSI’s visit: http://www.navcen.uscg.gov/marcomms/gmdss/

mmsi.htm.

HOW CAN GARMIN HELP YOU WITH DSC?

To receive Distress Calls or Position Reports, you must have a DSC-equipped chartplotter as well as a

VHF radio with DSC support. During normal, non-emergency Position Report communication, Channel

70 (156.525 MHz) has been set aside as the VHF/DSC digital call channel. For a Distress Call, a mariner

presses the MayDay button on their VHF radio. The call transmits on an emergency channel with the

Download from Www.Somanuals.com. All Manuals Search And Download.

MMSI number attached to the call (if you have DSC support). Any DSC-equipped mariner (on sea or

land) within range can receive the call.

Reference

When the Garmin GPSMAP 178C is connected to a VHF with DSC support, the GPS unit displays

a Call List, Log, and a Directory available to store incoming information received from another user’s

DSC capable VHF/GPS combination. Basic wiring is required for the Garmin unit and VHF radio to

send and receive NMEA data from each other (pg.96).

Main Menu: DSC Tab

DSC Distress Call

With a Garmin DSC capable chartplotter/sounder properly connected to a VHF radio with DSC

output, you may receive any DSC Distress Call within range. A window pops up and a message dis-

plays when a Distress Call is received. To notify you a Distress Call has been received, an alarm sounds

(if enabled). The alarm only sounds on a Distress Call, and it does not sound on a Position Report.

Distress Calls are broadcasted to all DSC users in radio range.

Distress Call Message

Options available from this screen are:

•

Show on Map: If you immediately want to see the caller’s position they select ‘Show on Map’.

Create Waypoint: If you want to create a waypoint of that position, highlight ‘Create Waypoint’

and press ENTER/MARK.

You also have the ability to input a caller’s name, if it is known. (The caller’s name replaces the

MMSI number as a reference once it is entered.)

DSC Position Report

The Position Report operates similarly to the Distress Call. Remember this type of contact is like a

phone call, but no emergency alarms are set off and the call is speciﬁc to the receiver. Position Reports

are not broadcasted to all DSC users.

Position Report Message

Download from Www.Somanuals.com. All Manuals Search And Download.

DSC Call List

Reference

The DSC Call List displays the current calls received. The GPS can manage up to 50 calls. When

‘calls’ are received, they are updated constantly to give the most current information, even if the unit is

left unattended. Any entry from the Call List can be selected to show an Entry Review.

Main Menu: DSC Tab

DSC Log

When DSC calls are received, they are automatically stored in the Log, with the latest call at the top.

The unit may store up to 100 logs. Once 100 logs are received, the oldest log ﬁle is removed when a

new call is received. The Log displays information of call Type, Date/Time, Position, and MMSI/Name.

Pressing MENU from this page allows you to ‘Sort By Time’, ‘Sort By Name’, ‘Sort By (Call) Type’,

‘Delete’ (only after highlighting a particular call), and ‘Delete All’.

To Review a Call:

1. From the DSC tab of the Main Menu and the Log or Call List tab highlighted, press DOWN Arrow

DSC Entry Review

Keypad until the call you want to review is highlighted.

2. Press ENTER to select the call.

DSC Entry Review

The DSC Entry Review operates similarly to the Distress Page and Position Report Page. This page

has the additional option to ‘Delete’ the displayed call. From the DSC Entry Review, you can ‘Delete’ the

entry, ‘Show on map’, or ‘Create Waypoint’.and create a name for the entry.

DSC Directory

The DSC Directory acts much like a phone book. A user can save up to 50 contacts. The directory

lists by Name and MMSI number. Pressing MENU from this page allows you to create a ‘New Item’,

‘Delete Item’, or ‘Delete All’.

DSC Log

Download from Www.Somanuals.com. All Manuals Search And Download.

There are two ways to add a new entry into the directory.

To add a new Directory entry:

Reference

Main Menu: DSC Tab

1. Press Menu, then highlight ‘New Item’ and press ENTER.

2. Or, with the Directory Tab highlighted press the Arrow Keypad DOWN, highlight an empty ﬁeld and

press ENTER to access the New Directory Item window.

The New Directory Item window allows you to input information of a known contact.

To add the MMSI number, Name, or Comment:

1. Press UP/DOWN on the Arrow Keypad to highlight the MMSI, Name, or Comment ﬁeld.

2. Press ENTER to highlight the ﬁrst digit on that ﬁeld.

3. Press UP/DOWN on the Arrow Keypad to enter the numbers/letters.

4. Press LEFT/RIGHT on the Arrow Keypad to move to the next position.

5. Press ENTER to accept the entry.

Adding a Directory Entry

6. Press UP/DOWN on the Arrow Keypad, highlight the ‘Delete’ button and press ENTER to delete

the entry, or highlight the ‘OK’ button and press ENTER to accept the entry.

After creating a New Directory Item entry, the name created is attached to that particular MMSI

number. If you return to the Log, the new name is displayed under the corresponding MMSI number.

Another way to input a name is from the Entry Review page or the DSC Distress Call or DSC Posi-

tion Report pages. The Name ﬁeld is only available in the GPS. Names cannot be sent like the MMSI

numbers to other DSC users.

DSC Setup

Garmin chartplotters have the ability to turn DSC ‘On’ or ‘Off’. This option is beneﬁcial for users

who have more than one GPS chartplotter. If you want only DSC to display on a particular chartplotter,

turn DSC off on the remaining Garmin chartplotters that support DSC.

DSC Setup

“Simulate..” options only appear while in

Simulator mode..

Download from Www.Somanuals.com. All Manuals Search And Download.

A user also has the ability to simulate a Distress Call or a Position Report on this page. This is help-

ful for practice before connecting to the real system. The Distress Call simulator also helps to check if

alarms are working properly.

Reference

Main Menu: DSC/Card Tabs

To run a simulation:

1. Place the chartplotter into simulation (see pg. 7).

2. From the Main Menu, select the DSC tab, then highlight the Setup tab.

3. Highlight which simulation you wish to run and press ENTER.

Using the NAV Key

The receiver of a Distress Call or Position Report can quickly navigate to the caller using the NAV

button. Once the call is logged, press the NAV button and select to Go To the MMSI number or the

Name of the caller.

Card Tab— interface control for saving waypoints, routes and tracks to a data card.When data is saved

to a data card, it may be exchanged with other compatible units and Garmin’s MapSource PC program.

To transfer data to/from a data card:

1. Insert the data card. If there is already user data on the card, highlight ‘User Card’ and press

ENTER. From the ‘Card’ tab, select the checkbox next to each type of item you want to transfer. You

may also press MENU and choose to ‘Select All’ or ‘Clear All’.

Card Tab

2. Highlight ‘Save To Card’ and press ENTER to save the selected items to the data card.

3. If transferring data from the card to the unit, highlight ‘Merge From Card’ and press ENTER to

combine the selected items with those of your GPS. highlight ‘Replace From Card’ and press ENTER

to overwrite all selected items on your GPS.

4. A ‘Transfer Complete’ message appears once the data has been transferred. Press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

Map Tab— contains setup options for the Map Page. See page 25.

Hiway Tab— contains setup options for the Highway Page. See page 43.

Reference

Temp (Temperature) Tab— displays the water temperature log (if equipped with a temperature

transducer/sensor). The chart reads from right to left, so that the most recent temperature measured is

displayed on the far right side of the chart. The dotted lines within the chart indicate intervals in the

temperature scale and the duration of time.

Main Menu: Temp Tab/

Setup Tab

The following settings are available:

Time

Duration

•

Temperature Scale – sets the temperature range (in degrees) for displaying the log. Select ‘Auto’ to

have the unit automatically determine the best range, or select a span of 2, 4, 6, 8 or 10 degrees.

•

Time Duration – sets how fast or slow the temperature log scrolls; the shorter the time duration,

the faster the temperature log scroll. Select a duration from 1 minute to 2.5 hours.

Temperature

Scale

Sonar Tab— contains setup options for the Sonar Page. See page 39.

Setup Tab— consists of three submenu tabs; System, Units, and Time.

Main Menu—Temp Tab

System Submenu Tab— controls system settings for beeper, speed ﬁlter, languages, system mode,

simulator controls, restores factory settings, and displays software version.

The following settings and options are available:

•

Beeper – controls audible beep. Select from ‘Off’, ‘Alarms Only’ (sounds for alarms/messages), or

‘Key and Alarm’ (sounds for key presses and alarms/messages).

•

Speed Filter – averages speed-readings. Choose from ‘Off’, ‘Auto’ (automatically controls ﬁlter-

ing), or ‘On’ (allows you to enter a value from 1 to 255 seconds).

•

Language – select from various languages for the unit’s on-screen display.

System Mode – select from ‘Normal’ (Normal Navigation) or ‘Simulator’ (For practice ONLY),

Sounder Only, or GPS Only.

Main Menu—System Tab

(Normal Mode)

Set Position* – allows to set your location while in simulator mode. See page 11, starting with

step 2, for additional instructions.

Download from Www.Somanuals.com. All Manuals Search And Download.

Track Control* – ‘Auto Track’ steers to the current navigation point. ‘User Track’ allows you to

enter a heading in the ‘Track’ ﬁeld.

Reference

Track* – lets you enter a heading.

Main Menu: System Tab/

Units Tab

Speed* – lets you enter a speed.

Transducer* – lets you simulate using a Depth Only, Temp Only, or Temp/Speed transducer.

* These ﬁelds only appear when the unit is in Simulator Mode.

System Information – displays the unit’s software, basemap version, and electronic serial number.

•

Press MENU for the following options:

•

Defaults – restores settings on System page to default values.

All Unit Defaults – restores all settings to Garmin’s original setup values for the entire unit.

Units SubmenuTab— deﬁnes settings for Position Format, Map Datum, Heading, Distance,

Speed, Elevation, Depth, and Temperature.

The following settings are available:

Main Menu—System Tab

(Simulator Mode)

•

Position Format – is used to change the coordinate system in which a given position read-

ing is displayed. You should only change the position format if you are using a map or chart

that speciﬁes a different position format or wish to use a format you are familiar with. The

default format is latitude and longitude in degrees, minutes, and thousandths of a minute

(hddd°mm.mmm’). The following additional formats are available:

• hddd.ddddd° – latitude/longitude in decimal degrees only

• hddd°mm’ss.s” – latitude/longitude in degrees, minutes, seconds

• UTM/UPS – Universal Transverse Mercator / Universal Polar Stereographic grids

• British Grid

• India Zones

• MGRS

• Swedish Grid

• W Malayan RSO

• Dutch Grid

• Irish Grid

• New Zealand

• Swiss Grid

• Finnish KKJ27

• Loran TD

• Qatar Grid

• Taiwan Grid

• German Grid

• Maidenhead

• RT90

• User Grid

Main Menu—Units Tab

Download from Www.Somanuals.com. All Manuals Search And Download.

For additional information on Loran TD setup, see page 102.

Reference

•

Map Datum – allows you to manually select the datum reference used to determine a given posi-

tion. The default setting is ‘WGS 84’. The unit automatically chooses the best datum depending

upon your chosen position format. Datums are used to describe geographic positions for surveying,

mapping, and navigation and are not actual maps built in the unit. Although over 100 datums are

available (as listed on page 104), you should only change the datum if you are using a map or chart

that speciﬁes a different datum.

Main Menu: Units Tab

The Units tab settings affect how navigation information

is displayed on the GPSMAP 178C. When in doubt, seek

assistance.

WARNING: Selecting the wrong map datum can result in substantial position errors.

•

Heading – lets you select the reference used in calculating heading information. You can select from

If you are using a map or chart in conjunction with your

GPS, make sure the settings under the ‘Units’ tab of the

GPSMAP 178C match that of the map or chart. This infor-

mation should be displayed somewhere on the map or chart.

If the information is not present, contact the map or chart

maker to determine what position format, datum, heading

and units of measure are being used for the map or chart.

‘Auto Mag Var’, ‘True’, ‘Grid’ and ‘User Mag Var’. ‘Auto Mag Var’ provides magnetic north heading

references which are automatically determined from your current position. ‘True’ provides headings

based upon a true north reference. ‘Grid’ provides headings based on a grid north reference (and

is used in conjunction with the grid position formats described on page 84). ‘User Mag Var’ allows

you to specify the magnetic variation at your current position and provides magnetic north heading

references based upon the variation you enter.

To enter a user deﬁned magnetic variation:

1. With the Heading ﬁeld set to ‘User Mag Var’, highlight the heading reference ﬁeld (immediately to the

right) and press ENTER.

WARNING: If ‘User Mag Var’ is selected, you must

periodically update the magnetic variation as your position

changes. Using this setting, the unit does not automati-

cally calculate and update the magnetic variation at your

present position. Failure to update this setting may result in

substantial differences between the information displayed

on your unit and external references, such as a magnetic

compass.

2. Use the ARROW KEYPAD to enter the magnetic variation at your current position and press

ENTER.

•

Distance, Speed and Elevation – lets you select the desired units of measure for distance, speed and

elevation readouts in ‘Nautical’ (nm, kt, ft), ‘Nautical’ (nm, kt, m), ‘Statute’ (mi, mh, ft) or ‘Metric’

(km, kh, m) terms.

•

Depth – lets you select the desired units of measure for depth in Feet (ft), Fathoms (fa) or Meters (m).

Temperature – lets you select the desired units of measure for temperature in Fahrenheit (°F) or

Celsius (°C).

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

Time Submenu Tab— displays the current time and date, allows you to adjust the 12 or 24-hour

time format, enter a time zone, and adjust for daylight savings to show correct local time.

Main Menu: Time/

Comm Tab

The following options are available:

•

Time Format – choose from 12 or 24-hour (military) time format.

Time Zone – choose your correct time zone to show correct local time or enter a UTC Offset.

The UTC (also called Greenwich Time) offset is how many hours you are ahead or behind the

time line. See the table on page 110 for time offsets.

•

Daylight Savings – choose from ‘Auto’, ‘On’, or ‘Off’ to adjust for daylight savings.

Comm (Communications) Tab— lets you control the input/output format used when connecting

your GPSMAP 178C to external NMEA devices, a DGPS beacon receiver, a personal computer, another

Garmin GPSMAP 178C, etc. If a DGPS receiver is used, WAAS capability is automatically turned to

‘Off’. The unit supports two input/output ports. See page 96 for more information on wiring and

NMEA information. Individual Port settings are:

Main Menu—Time Tab

Port 1:

•

Garmin Data Transfer – the proprietary format used to upload/download MapSource data,

exchange waypoint, route, track, almanac, and proximity data with a PC or another Garmin

GPSMAP 178C. When you select ‘Garmin Data Transfer’, there are 11 Transfer Modes to choose

from: Host, Request Almanac, Request Proximity, Request Routes, Request Tracks, Request

Waypoints, Send Almanac, Send Proximity, Send Routes, Send Tracks and Send Waypoints.

Main Menu—

Comm Tab

•

NMEA In/NMEA Out – supports the input/output of standard NMEA 0183 data and DSC.

None – provides no interfacing capabilities.

Data Transfer Progress

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

Port 2:

•

Garmin DGPS – used to connect the GPSMAP 178C with a Garmin DGPS beacon receiver.

Main Menu: Comm Tab

Other DGPS – allows DGPS input using a standard RTCM format, without any output capabili-

ties.

•

NMEA In/NMEA Out – supports the input/output of standard NMEA 0183 data and DSC. You

may also adjust the NMEA output.

RTCM In/NMEA Out – allows Differential GPS (DGPS) input using a standard RTCM format

and also provides NMEA 0183 output.

None – provides no interfacing capabilities.

To select an input/output format:

1. Select the desired Port tab, then highlight the ‘Serial Data Format’ ﬁeld and press ENTER.

2. Use the ARROW KEYPAD elect the desired setting and press ENTER.

To select a transfer mode:

1. Use the ARROW KEYPAD to select ‘Garmin Data Transfer’ in the ‘Serial Data Format’ ﬁeld.

2. Highlight the ‘Transfer Mode’ ﬁeld and press ENTER.

When transferring data between two Garmin units,

be sure to always set one to ‘Host’ and use the other

unit to either Send or Request the desired data.

3. Use the ARROW KEYPAD to select the desired setting and press ENTER.

You may also adjust the NMEA output to enable/disable certain sentences and adjust the number

of Lat/Lon output precision digits. You must have one of the ports set to NMEA In/NMEA Out to use

this option. Settings affects both Port 1 and Port 2 NMEA outputs.

To restore the Serial Data Format settings to the default ‘Garmin Data Transfer’:

1. From the Comm tab, press MENU, highlight ‘Defaults’ and press ENTER.

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

If ‘Garmin DGPS’ or ‘RTCM In/NMEA Out’ format is selected, additional ﬁelds are provided to

control a Garmin differential beacon receiver directly from your GPSMAP 178C. You may have the unit

automatically scan for the DGPS beacon signal or you can enter the beacon frequency and bit rate on

the unit and the information is used to tune the beacon receiver.

Main Menu: Comm Tab

To have the unit automatically scan for a frequency:

1. With the unit set to ‘Garmin DGPS’ or ‘RTCM In/NMEA Out’, use the ARROW KEYPAD to high-

light the “Beacon” ﬁeld and press ENTER.

Status Field

2. Highlight ‘Scan’ and press ENTER. The numbers in the ‘Frequency’ ﬁeld changes as the unit scans

from 284 kHz to 325 kHz, 200 bit rate, then 100, at 6-second intervals.

To restart the scan:

1. Press MENU, highlight ‘Restart Scan’ and press ENTER.The “Status” ﬁeld shows one of the

SNR and Distance shows data

when signal is received.

following:

•

Tuning – unit is attempting to tune to the speciﬁed frequency and bit rate.

Scanning – unit is automatically scanning through the frequencies and bit rates.

Receiving – unit is receiving DGPS signal and ready for operation.

Check Wiring – unit is not making connection with DGPS receiver.

When the unit is receiving a DGPS signal, the “SNR” (Signal to Noise Ratio) and “Distance” ﬁelds

shows data. The SNR range is 0dB to 30dB, with 30 being the best. The Distance may or may not show

data, depending upon the signal being broadcast from the DGPS site.

The DGPS beacon transmitters are operated by the U.S. Coast Guard (or similar government

agency in other countries), which is responsible for their accuracy and maintenance. For DGPS trans-

mitter problems or to ﬁnd the most updated list of frequencies and coverage areas, contact your local

USCG, or see their web site at http://www.navcen.uscg.mil/.

You may also manually enter a

frequency and bit rate.

Download from Www.Somanuals.com. All Manuals Search And Download.

Reference

NMEA Interface

If you are going to interface the GPSMAP 178C with another piece of equipment (such as a radio

or autopilot), the unit needs to be set to output NMEA data. More information on wiring and NMEA

data may be found on page 96.

Main Menu: Comm Tab

To activate the NMEA data:

1. On either port of the Comm Tab, highlight the ‘Serial Data Format’ ﬁeld and press ENTER.

2. Select ‘NMEA In/NMEA Out’ and press ENTER.

Advanced NMEA Output Setup

The GPSMAP 178C NMEA data transmission can be customized to change the precision of the

Lat/Lon minutes, set up the waypoint IDs, and keep the output rate at two seconds. If the unit is set up

to output all of the available NMEA sentences, the output rate may exceed two seconds. The ‘Advanced

NMEA Output Setup’ page allows you to turn on/off the GPS status (GSA. GSV), Waypoint/Route

(WPL, RTE), and the Garmin Proprietary sentences. See page 96 for more information on wiring and

NMEA data.

Activating NMEA data

Lat/Lon Minutes Precision allows you to adjust the number of digits to the right of the decimal

point for transmission of NMEA Output, either 2, 3 or 4 digits. The Waypoint ID setting lets you

choose to output the waypoint identiﬁers as names or numbers.

To set up the Advanced NMEA page:

1. Highlight ‘NMEA In/NMEA Out’ in the Serial Data Format ﬁeld, and press MENU. Select ‘NMEA

Setup’ and press ENTER.

2. To change the settings, place the highlight over the desired ﬁeld and press ENTER. Make a

selection and press ENTER again to accept the selection.

Download from Www.Somanuals.com. All Manuals Search And Download.

GPSMAP 178C NMEA Sentence Output (NMEA version 3.01 compliant)

Reference

Always transmitted: GPRMC, GPGGA, GPGLL, GPBWC, GPVTG, GPXTE, GPRMB, SDDBT,

SDDPT, SDMTW, SDVHW

Main Menu: Comm Tab/

Alarm Tab

Switchable sentences: GPGSA, GPGSV, GPWPL, GPRTE

Garmin proprietary: PGRME, PGRMZ, PGRMM

Alarm Tab— contains setting for the unit’s alarms. The Alarm tab is divided into three submenus:

System alarms, Nav alarms, and Sonar alarms.

System Submenu Tab

Clock – provides an alarm for the system clock. Enter a time in the time ﬁeld and turn the alarm

on and off from the control ﬁeld menu. Remember to enter alarm times in the same time format

(UTC or local) you’re using for your system. The unit must be on for the clock alarm to work.

Advanced NMEA

Setup Page

Battery – sets an alarm to sound when the battery is reaching a critical state of discharge.

DGPS – sets an alarm to sound when the unit loses a differential ﬁx.

Accuracy – sets an alarm to sound when the GPS position accuracy falls outside the user-set

value.

Nav Submenu Tab

Anchor Drag – sets an alarm to sound when you’ve exceeded a speciﬁed drift distance. Enter a

value in the distance ﬁeld and use the control ﬁeld to turn the alarm on and off.

Arrival – sets an alarm to sound when you’re a speciﬁed distance or time away from a destina-

tion waypoint. Enter a distance radius or time for sounding the alarm and use the control ﬁeld

to set the alarm to ‘Off’, ‘Dist’ (Distance), or ‘Time’.

Main Menu—Alarm Tab

(System Submenu)

Off Course – sets an alarm to sound when you’re off a desired course by a speciﬁed distance.

Enter a distance in the distance ﬁeld and use the control ﬁeld to turn the off course alarm on

Download from Www.Somanuals.com. All Manuals Search And Download.

and off.

Reference

Sonar Submenu Tab

Main Menu: Alarm Tab

Shallow Water/Deep Water – set alarms to sound when you enter an area of speciﬁed depth

that is too shallow and/or too deep. You must be receiving sonar data for this function to work.

Water Temperature – sets an alarm to sound when the transducer reports a temperature either

above, below, inside or outside the speciﬁed values.

Fish – sets an alarm to sound when the unit detects a ﬁsh of the speciﬁed size symbol(s).

To set an alarm:

1. Use the ARROW KEYPAD to highlight desired submenu tab of the Alarm Tab.

2. Highlight the ﬁeld below the alarm name you wish activate and press ENTER.

3. Change the mode to the desired setting and press ENTER.

Main Menu—Alarm Tab

(Nav Submenu)

4. Highlight the next ﬁeld to the right and press ENTER, then enter the desired settings and press

ENTER to ﬁnish.

5. If you want the alarm to display and beep until acknowledged, highlight the ‘Persist’ box and press

ENTER to place a check mark in the box.

Main Menu—Alarm Tab

(Sonar Submenu)

Download from Www.Somanuals.com. All Manuals Search And Download.

Appendix A

Installing the GPSMAP 178C

The GPSMAP 178C must be properly installed according to the following instructions to get the

best possible performance. To complete the installation, you’ll need the appropriate fasteners and a 1” x

14-thread marine antenna mount available at most marine dealers. (If you have a GPSMAP 178C with

an internal antenna, skip to the next page.) When in doubt, seek professional assistance.

Antenna Installation

Mounting the GPS Antenna

The antenna should be mounted in a location that has a clear, unobstructed view of the sky in all

directions to ensure the best reception. Avoid mounting the antenna where it is shaded by the boat’s

superstructure, a radome antenna, or mast. Keep the antenna away from the path of a radar’s beam.

Sailboat users should avoid mounting the antenna high on the mast to prevent inaccurate speed read-

ings caused by excessive heeling. Most marine VHF and LORAN antennas do not seriously degrade the

GPS antenna’s reception. Never paint the antenna or clean it with harsh solvents.

Suggested locations for mounting the GA 29 antenna.

The Garmin antenna screws directly onto any standard 1” x 14-thread antenna mount. If you

need to raise the antenna to avoid shading, try using a 1” x 14-thread extension mast available at most

marine dealers.

To install the GPS antenna:

1. Screw the antenna directly onto the 1” x 14-thread mount.

2. Route the cable to the mounting location of the display unit. Use appropriate tie-wraps, fasteners,

and sealant to secure the cable along the route and through any bulkhead or deck.

It is possible to route the coaxial cable either through or

outside the antenna mount. It is possible to remove the BNC

connector on the coaxial cable and shorten the coaxial cable

to ease installation, however, doing so voids the antenna

warranty. If the BNC connector is removed it must be

replaced with a new solder-on or crimp BNC (RG 58 or 59

compatible) connector.

3. Once the GPSMAP 178C unit has been installed, connect the cable to the antenna connector on

the back of the display unit. Make sure that you turn the antenna cable connector 1/4 turn clock-

wise to lock the cable into place.

Download from Www.Somanuals.com. All Manuals Search And Download.

Appendix A

Mounting the GPSMAP 178C Unit

The GPSMAP 178C’s compact, waterproof case is suitable for mounting in exposed locations or at

the nav station. The unit comes with a gimbal bracket that can be used for surface or overhead mount-

ing. When choosing a location for the display unit, make sure you consider the following conditions:

Unit Installation

•

There should be at least a 3” (5 cm) clearance behind the case to allow connection of the

antenna (external antenna only), power/data cables.

The mounting surface should be heavy enough to support the unit and protect it from exces-

sive vibration and shock.

For GPSMAP 178C with a built-in internal antenna, it should be mounted in a location that has

the clearest, most unobstructed view of the sky in all directions to ensure the best reception.

Avoid mounting the unit where it is blocked by the boat’s superstructure, a radar arch, or mast.

NOTE: The temperature range for the GPSMAP 178C is 5°F to 158°F

(-15°C to 55°C). Extended exposure to temperatures exceeding this range (in storage

or operating conditions) may cause failure of the LCD screen. This type of failure and

related consequences are NOT covered by the manufacturer’s limited warranty.

To swivel mount the GPSMAP 178C display:

Secure the base and attach the mount

Tools (not included) — Drill, Screwdriver (Phillips or Standard), three #8 (4mm) pan head machine

bolts with matching nuts and washers and a 5/32” (5mm) drill bit, OR three #8 pan head self-tap-

ping screws and an appropriately-sized drill bit for drilling starter holes. Always wear safety goggles,

ear protection, and a dust mask when drilling, cutting or sanding.

1. Using the swivel base as a template, mark the location of the three holes that are used to secure

the bracket to the mounting surface.

The swivel base is designed to be secured using a pan

head screw or machine bolt. If you use a screw with a

countersunk head, you risk damaging the Mounting

Base.

2. If securing the base with machine bolts, drill three 5/32” (5mm) holes at the locations you marked.

OR, if securing the base with self-tapping screws, drill starter holes at the locations you marked.

Starter holes should generally be no deeper than half the screw length.

3. Secure the swivel base with three bolts or screws. DO NOT OVERTIGHTEN.

4. Place the rest of the mount over the swivel base and secure with the short knob.

Download from Www.Somanuals.com. All Manuals Search And Download.

Installing the Unit on the Mounting Bracket

Appendix A

1. Align the slot on the back of the unit with the long mounting knob and slide in place. It may be

necessary to adjust the long mounting knob to spread the bracket arms apart. (Turn counter-clock-

wise to widen the bracket arms, clockwise to tighten.)

Unit Installation

2. Adjust the unit angle and tighten the long mounting knob until snug.

3. To tilt the unit, loosen the long mounting knob on the right side of the bracket assembly.

4. To rotate the entire bracket, twist it left or right. The bracket clicks as you turn it.

5. Tighten all knobs once the desired viewing angle is obtained.

Adjust for optimal viewing

Slide the unit onto the bracket

Download from Www.Somanuals.com. All Manuals Search And Download.

Flush Mounting the GPSMAP 178C External Antenna Unit

Appendix A

The GPSMAP 178C External Antenna only can be ﬂush mounted on a ﬂat panel. When ﬂush

mounting the GPSMAP 178C, be sure to choose an appropriately sized location for the unit. Check

that all cables reach the unit mounting location before beginning installation. Use the Flush Mount

Template provided in the box to determine a location. Always wear safety goggles, ear protection, and a

dust mask when drilling, cutting or sanding.

Unit Installation

To ﬂush mount the GPSMAP 178C (External Antenna ONLY):

Included Mounting Hardware — 4 - 3mm Studs, 4 - Flat Washers, 8 - 3mm Hex Nuts.

Tools (not included) — Center Punch, Drill, 1/8” (3mm) Drill Bit, 3/8” (6mm) Drill Bit, Jig Saw, 1/16”

(2mm) Allen Wrench, 9/35” (7mm) Wrench.

1. Trim the Flush Mount Template and tape in the desired location.

Hex Nuts

Washer

2. Using a Center Punch, indent the center of each Mounting Hole location.

3. Using a 1/8” (3mm) drill bit, drill the four Mounting Holes.

4. Using a 3/8” (6mm) drill bit, drill a hole for a location to begin cutting the mounting surface.

5. Using the Jig Saw, cut the mounting surface along the inside of the dashed line indicated on the

template. Be very careful when cutting this hole, there is only a small amount of clear-

ance between the unit and the Mounting Holes. It may be prudent to cut slightly inside the

indicated line and then sand or ﬁle the panel as needed to obtain the best ﬁt.

Studs

6. Install the four Mounting Studs into the unit by screwing the shorter section into the back of the

unit. Use a 1/16” (2mm) Allen Wrench to tighten the Mounting Studs until the stops contact the

case. Be careful not to overtighten as this may damage the Mounting Stud. The studs have a reus-

able thread-locking patch pre-applied from the factory.

7. Place the unit in position inside the cutout area of the mounting surface.

8. Place washers over the Mounting Studs, then thread on one Hex Nut per Mounting Stud. Tighten

all four Hex Nuts until the unit is snug against the mounting surface. Install and tighten the second

Hex Nut on all four Mounting Studs to lock the ﬁrst Hex Nut in place.

Download from Www.Somanuals.com. All Manuals Search And Download.

Connecting the Power/Data Cable

Appendix A

The power/data cable connects the GPSMAP 178C to 10-35 volt DC system and provides interface

capabilities for connecting external devices. The color code in the diagram below indicates the appro-

Wiring and Interfacing

priate harness connections.

To Transducer

You can download a copy of Garmin's

proprietary communication protocol from the

Help and Support section of our web site at

www.garmin.com.

Note: During a typical installation,

only the Red and Black wires are used.

The other wires do not have to be con-

(red) + 10-35 VDC

nected for normal operation of the unit.

(black) - Ground (Power/Data)

Replacement fuse: AGC/3AG - 2.0 Amp

To Unit

(blue) Port 1 Data OUT

Power Source

Complete information concerning

NMEA & RTCM formats and

sentences is available for purchase

from NMEA at:

(brown) Port 1 Data IN

RXD +

Autopilot/

NMEA Device

(white) Port 2 Data IN

Pin 11 - Yellow (Alarm)

Pin 14 - Green (TX COM 2)

RXD -

(green) Port 2 Data OUT

Pin 15 - Red (DC Positive)

NMEA

(yellow) Alarm Low

Pin 13 - White (RX COM 2)

Pin 16 - Brown (RX COM 1)

Seven Riggs Avenue

Severna Park, MD 21146

U.S.A.

Pin 18 - Black (Ground)

Pin 17 - Blue (TX COM 1)

Beacon

Receiver or

DSC VHF

TX+

RX+

Alarm Relay

100ma max

coil current

(Cable View)

410-975-9425

Interfacing

410-975-9450 FAX

www.nmea.org

The following formats are supported for connection of external devices: Garmin proprietary Dif-

ferential GPS (DGPS), NMEA 0183 version 3.01, RTCM SC-104 input (version 2.0).

Radio Technical Commission For

Maritime Services (RTCM)

1800 Diagonal Road, Suite 600

Alexandria, VA 22314-2480

U.S.A.

The following are the sentences for NMEA 0183, version 3.01 output:

Approved sentences— GPBWC, GPRMC, GPGGA, GPGSA, GPGSV, GPGLL, GPBOD, GPRMB, GPRTE,

GPVTG, GPWPL and GPXTE. Sonar— SBDDBT, SDDPT, SDMTW, and SDVHW Proprietary sen-

tences— PGRME, PGRMZ, and PSLIB.

703-684-4481 (Info Only)

703-836-4229 FAX

www.rtcm.org

Download from Www.Somanuals.com. All Manuals Search And Download.

Transducers

Appendix A

The transducer acts as the eyes and ears of your new sonar. Proper transducer selection and

installation are critical to the operation of your unit. The transducer transmits sound waves toward the

bottom in a cone shape. The larger the cone angle, the larger the coverage area at a given depth.

Selecting a Transducer

A wide cone angle transducer works best in shallow water. The wide cone angle provides a large

coverage area, but at a decreased bottom resolution. In deeper water this can result in a large dead zone

where ﬁsh cannot be seen. A narrow cone angle transducer is better suited to deep-water installations.

The narrow cone angle provides a smaller viewing area (compared to a wide cone angle transducer at

the same depth) with improved bottom resolution and a smaller dead zone. Dual frequency transduc-

ers give you the best of both wide and narrow cone angles.

The GPSMAP 178C is packaged with and without a transducer. Depending on which transducer

you select, you will have either single or dual frequency performance. Since many mounting locations

vary, there are a variety of standard and optional transducers, and accessories which are available. See

your local Garmin dealer or contact Garmin to help you in your selection of optional transducers and

accessories.

Wide cone angle

Narrow cone angle

dead zone

fish not seen

Download from Www.Somanuals.com. All Manuals Search And Download.

Proper transducer installation is key to getting the best performance from your new unit. If the

transducer lead is too short, extension cables are available from your Garmin dealer. DO NOT cut the

transducer lead or any part of the transducer cable, as this voids your warranty. The cable cannot be

spliced and connected to any existing (Garmin or non-Garmin) transducer cables.

Appendix A

Mounting the Transducer

Following are some tips and basic installation instructions for some popular transducers. Detailed

installation instructions are provided in the transducer kits. Some transducers may need to be installed

by a professional marine installer.

DO NOT mount the transducer behind strakes, struts,

ﬁttings, water intake or discharge ports, or anything that

creates air bubbles or causes the water to become turbulent.

It is important that the transducer be in clean (non-turbu-

lent) water for optimal performance.

Transom Mount Installation

Transom Mount Transducer (depth/temp)

USS Jayhawk

To Unit

Mount the transducer cable cover

well above the waterline.

Apply marine sealant to all

screw threads to prevent water

from seeping into the transom.

Transducer should extend 1/8" (3mm) below

fiberglass hull or 3/8" (10mm) below aluminum hull

Make sure that the transducer is

below water level when the boat

is on plane at high speed

Speed

Temp Transducer

Do not mount transducer directly in the

path of the prop. The transducer can cause

cavitation that may degrade the boat's performance

and damage the prop.

Additional Sensor Installation

Mount the transducer parallel with the bottom.

Download from Www.Somanuals.com. All Manuals Search And Download.

To avoid drilling a hole to mount a thru-hull transducer, a transom mount transducer may be used

with epoxy inside a boat (“shoot-thru-hull” installation). For a transducer to be mounted inside the

hull (shoot-thru, not thru-hull), the boat must be ﬁberglass, no core (contact your boat manufacturer if

you are unsure). Test by placing a small amount of water inside the hull, placing the transducer on top

of the water, then verifying the accuracy of the locators versus the current water depth. If they are the

same, use slow-curing epoxy (non-silicone based) to afﬁx the transducer to the inside of the hull.

Appendix A

Mounting the Transducer

Shoot-Thru-Hull Installation

The transducer is designed to be mounted inside a ﬁberglass hull. The standard plastic transom

mount transducer can also be mounted in this fashion using this method. If using a temperature sens-

ing transducer, the temperature displayed reﬂects the hull temperature.

Weight transducer

to hold it in place

PVC Pipe

or a Can

Selecting a location:

1. The location has to be solid ﬁberglass, devoid of any air bubbles, laminates, ﬁllers or dead air space.

The location needs to be in an area of clean water at all speeds. Do not place the transducer over

any strakes or behind any obstruction on the hull that would create turbulence at speed.

Fill Pipe or Can

with water or a

light mineral oil

Strip Caulk

or RTV Sealer

NOTE: Many modern hulls have a prelocated pocket for shoot-thru-hull transducer

installation. If you are unsure if your hull is equipped with a pre-located pocket,

contact your hull manufacturer.

)

Hull Surface

Testing the Location

Testing the location:

1. Place the transducer in the water, pointed directly at the bottom and set unit for optimum perfor-

mance. Place the transducer in the test device as show on the side bar. If the sonar performance is

signiﬁcantly degraded, another location needs to be tested.

Installing the transducer:

1. Lightly sand the surface of the hull and face of the transducer with 400 grit wet or dry sandpaper.

2. Build a dam using strip caulk about 1/4” tall. Pour about 1/8” of two part, slow cure epoxy in the

dam. Place the transducer in the epoxy, turning the transducer to work out any air bubbles.

3. Weight the transducer in place and allow to cure for 24 hours.

Download from Www.Somanuals.com. All Manuals Search And Download.

Testing the Installation

Appendix A

While it is possible to perform some checks with the boat trailered, the boat should be in the water

to properly test the sonar portion of the installation.

Testing the Installation

Press the POWER button and the GPSMAP 178C should power on. If the unit fails to power on,

verify that the wiring adapter is seated properly in the back of the unit, the Red and Black wires are

connected to the correct polarity, and that the fuse is installed and not blown. If the unit is connected

to a power supply that exceeds 35 VDC, a “Battery Voltage High” warning is displayed and the unit

turns off.

Since water is necessary to carry the sounder’s sonar signal, the transducer must be in the water

to work properly. It is not possible to get a depth/distance reading when out of the water. As the unit

powers on, it should immediately start showing the bottom. Verify that the unit is not in the simulator

mode. If the unit is in the simulator mode, make sure that the transducer is connected to the wiring

harness.

To test the transducer installation, gradually increase the boat speed while checking the unit opera-

tion. If the unit displays intermittently or fails to display, verify that the transducer is aligned parallel

with the bottom and if necessary, adjust the transducer height until the unit operates correctly. It may

be necessary to make several adjustments to ensure proper operation throughout the speed range.

NOTE: When adjusting the depth of the transducer, make the adjustments in small

increments. Placing the transducer too deep can adversely affect the boat’s

performance and put the transducer at greater risk of striking underwater objects.

)

100

Download from Www.Somanuals.com. All Manuals Search And Download.

Installing and Removing Data Cards

Appendix A

The GPSMAP 178C uses optional Garmin marine BlueChart and MapSource data cards to display

digital charts and maps on-screen. You may also transfer user data to data cards (pg 82) Data cards are

installed in the card slot located at the bottom right of the unit. Data cards may be installed or removed

at any time, whether the unit is on or off.

Installing and Removing

Data Cards

To install a data card:

1. Open the card door by pressing together on the two handles at the bottom of the door and lifting it

up and open.

2. Insert the card into the slot, with the label facing top and the handle towards you.

3. Firmly push the card into the unit. It in not necessary to force the card and about 1/2” is still

exposed when it is properly inserted. If the unit is on, a conﬁrmation tone sounds and a

message displays on the screen noting the card details when the card has been properly installed

and accepted.

4. Close the cover.

If you insert a data card and get a ‘card format not recognized’ message, try removing the card and

reinserting it. If the card is still not recognized, contact the Garmin or your Garmin dealer for assis-

tance. Data cards are not waterproof, should not be exposed to moisture or excessive static charges,

and should be stored in the case supplied with the card.

The ﬁrst time you insert a

data card, the unit takes

a few seconds to read the

card.

To remove a data card:

1. Open the card door by pressing together on the two handles at the bottom of the door and lifting it

up and open.

Once the data card has

been read, a summary

screen appears. Press

ENTER to acknowledge.

2. Grasp the card handle and pull out ﬁrmly.

3. If the unit is on, a conﬁrmation tone sounds when the data card has been removed.

101

Download from Www.Somanuals.com. All Manuals Search And Download.

Loran TD System

Appendix B

LORAN-C is a radio navigation aid operated and maintained in the United States by the United

States Coast Guard. The name LORAN is an acronym for “LOng RAnge Navigation”. The LORAN

system covers the entire United States and the U.S. Coastal Conﬂuence Zone. From the perspective of

a mariner, the system is used for ocean and coastal navigation. It can be used as a supplemental system

for harbor and harbor approach navigation, and it is used for inland navigation by recreational vehicles.

Loran TD

LORAN TD Feature

The LORAN TD (Time Delay) feature eases the transition from using LORAN to using GPS. The

GPSMAP unit automatically converts GPS coordinates to LORAN TDs for those who have a collec-

tion of LORAN ﬁxes for favorite ﬁshing spots and other waypoints recorded as TDs. You can display

your position as a TD or enter waypoints as TDs. The accuracy to be expected from this conversion is

approximately thirty meters. When the unit is placed in the LORAN TD format mode, it simulates the

operation of a LORAN receiver. Position coordinates may be displayed as TDs, and all navigation func-

tions may be used as if the unit was actually receiving LORAN signals.

On the Units Tab of the Main Menu, press

MENU, then highlight ‘Loran TD On’ and

press ENTER to select Loran TD.

Using the LORAN TD Format

When creating new waypoints using LORAN TD coordinates, you must set the correct LORAN

chain number and secondary stations in the Setup TD ﬁeld before storing the waypoint. You must have

the correct chain number as well as the secondary station identiﬁers to use this option correctly. These

values vary per coordinate set or geographical location. Failure to enter correct information could result

in inaccuracies for the desired destination. After the waypoint is stored in unit memory, it always refer-

ences the LORAN chain number and secondary stations currently selected in the Setup TD ﬁeld. If you

enter a different LORAN chain number, change the secondary stations or offsets in the Setup TD ﬁeld,

the active waypoint information reﬂects those changes. Since the GPSMAP unit does not rely on the

LORAN signal for navigation, it can reference a different GRI chain and/or secondary stations and still

navigate to the location stored in memory.

Or, highlight the Position Format ﬁeld,

highlight ‘Loran TD’ and press ENTER to

select Loran TD.

102

Download from Www.Somanuals.com. All Manuals Search And Download.

Appendix B

The ‘LORAN TD Setup’ window contains the ﬁelds to select the Loran GRI-Chain Number, Primary

and Secondary Stations, and TD Offsets.

Loran TD Setup

To setup Loran TD from the Main Menu:

1. Using the ARROW KEYPAD, highlight the ‘Setup tab, then press RIGHT to highlight the ‘Units’

submenu tab. Highlight the “Position Format” ﬁeld and press ENTER. You may also press MENU

from the “Units” tab to display the ‘Loran TD On’ option. (If you use ‘Loran TD On’, skip to step 3.)

2. Highlight ‘Loran TD’, press ENTER, then highlight ‘Setup’ and press ENTER.

3. To change the settings of any of the ﬁve ﬁelds, highlight the ﬁeld, press ENTER, select/enter the

desired setting and press ENTER.

4. When done, press the QUIT key to return to the Main Menu.

If the active GRI Chain, secondary stations or offsets have been changed since the waypoint was

created, the waypoint now references the active GRI-chain and secondary stations and adjust the TD

coordinates accordingly. Remember that the GPS is not relying on the LORAN signal for navigation

and actually converts the TD coordinate to a useful LAT/LON coordinate (in the background) before

storing the waypoint to memory or using it for navigation. Because of this the unit can navigate to a TD

coordinate anywhere in the world.

Loran TD Setup Window

For more information on Loran TDs, you may download Garmin’s “Loran TD Position Format

Handbook” from the Garmin web site.

103

Download from Www.Somanuals.com. All Manuals Search And Download.

Chua Astro

Corrego Alegr

Djakarta

Chua Astro- Paraguay

Corrego Alegre- Brazil

Adindan

Adindan- Ethiopia, Mali, Senegal, Sudan

Afgooye- Somalia

Appendix C

Afgooye

Djakarta (Batavia)- Sumatra Island

(Indonesia)

AIN EL ABD ‘70

AIN EL ANBD 1970- Bahrain Island,

Saudi Arabia

Map Datums

Dos 1968

Dos 1968- Gizo Island (New Georgia

Islands)

Anna 1 Ast ‘65

ARC 1950

Anna 1 Astro ‘65- Cocos I.

ARC 1950- Botswana, Lesotho, Malawi,

Swaziland, Zaire, Zambia, Zimbabwe

Dutch

Easter Isld 67

European 1950

Easter Island 1967

ARC 1960

Kenya, Tanzania

European 1950- Austria, Belgium,

Denmark, Finland, France, Germany,

Gibraltar, Greece, Italy, Luxembourg,

Netherlands, Norway, Portugal, Spain,

Sweden, Switzerland

Ascnsn Isld ‘58

Astro B4 Sorol

Astro Bcn “E”

Astro Dos 71/4

Astr Stn ‘52

Ascension Island ‘58- Ascension Island

Sorol Atoll- Tern Island

Astro Beacon “E”- Iwo Jima

Astro Dos 71/4- St. Helena

Astronomic Stn ‘52- Marcus Island

European 1979

European 1979- Austria, Finland,

Netherlands, Norway, Spain, Sweden,

Switzerland

)

Aus Geod ‘66

Australian Geod ‘66- Australia, Tasmania

Island

The ‘User’ datum is based on a WGS-84 Local datum and is

an advanced feature for unlisted or custom datums. To learn

more, check your local library or on the world wide web for

educational materials on datums and coordinate systems.

Finland Hayfrd

Gandajika Base

GDA

Finland Hayford- Finland

Gandajika Base- Republic of Maldives

Geocentric Datum of Australia

Geodetic Datum ‘49-New Zealand

Guam 1963- Guam Island

Guadalcanal Island

Aus Geod ‘84

Australian Geod ‘84- Australia, Tasmania

Island

Austria

Geod Datm ‘49

Guam 1963

Bellevue (IGN)

Bermuda 1957

Bogata Observ

Campo Inchspe

Canton Ast ‘66

Cape

Efate and Erromango Islands

Bermuda 1957- Bermuda Islands

Bogata Obsrvatry- Colombia

Campo Inchauspe- Argentina

Canton Astro 1966- Phoenix Islands

Cape- South Africa

Gux 1 Astro

Hjorsey 1955

Hong Kong ‘63

Hu-Tzu-Shan

Indian Bngldsh

Indian Thailand

Indonesia 74

Ireland 1965

ISTS 073 Astro

Johnston Island

Hjorsey 1955- Iceland

Hong Kong

Taiwan

Indian- Bangladesh, India, Nepal

Indian- Thailand, Vietnam

Indonesia 1974-Indonesia

Ireland 1965- Ireland

Cape Canavrl

Cape Canaveral- Florida, Bahama

Islands

Carthage

Carthage- Tunisia

CH-1903

CH 1903- Switzerland

Chatham 1971

Chatham 1971- Chatham Island

(New Zealand)

ISTS 073 ASTRO ‘69- Diego Garcia

Johnston Island

104

Download from Www.Somanuals.com. All Manuals Search And Download.

NAD27 Mexico

NAD27 San Sal

N. American 1927- Mexico

Kandawala

Kandawala- Sri Lanka

Kerguelen Island

Appendix C

North American 1927- San Salvador

Island

Kerguelen Islnd

Kertau 1948

West Malaysia, Singapore

Cayman Brac Island

Liberia 1964- Liberia

Luzon- Mindanao Island

Map Datums

NAD83

North American 1983- Alaska, Canada,

Central America, CONUS, Mexico

L. C. 5 Astro

Liberia 1964

Nhrwn Masirah

Nhrwn Saudi A

Nhrwn United A

Naparima BWI

Obsrvtorio ‘66

Nahrwn- Masirah Island (Oman)

Nahrwn- Saudi Arabia

Sao Braz

Sao Braz- Sao Miguel, Santa Maria

Islands

Luzon Mindanao

Luzon Philippine

Luzon- Philippines

(excluding Mindanao Isl.)

Nahrwn- United Arab Emirates

Naparima BWI- Trinidad and Tobago

Sapper Hill ‘43

Schwarzeck

Sapper Hill 1943- East Falkland Island

Schwarzeck- Namibia

Mahe 1971

Marco Astro

Massawa

Mahe 1971- Mahe Island

Marco Astro- Salvage Isl.

Massawa- Eritrea (Ethiopia)

Merchich- Morocco

Observatorio 1966- Corvo and Flores

Islands (Azores)

Sth Amrcn ‘69

S. American ‘69- Argentina, Bolivia,

Brazil, Chile, Colombia, Ecuador,

Guyana, Paraguay, Peru, Venezuela,

Trin/Tobago

Old Egyptian

Old Hawaiian

Oman

Old Egyptian- Egypt

Old Hawaiian- Mean Value

Oman- Oman

Merchich

Midway Ast ‘61

Minna

Midway Astro ‘61- Midway

Minna- Nigeria

South Asia

SE Base

South Asia- Singapore

Southeast Base- Porto Santo and Madiera

Islands

Ord Srvy GB

Old Survey Grt Britn- England, Isle of

Man, Scotland, Shetland Isl., Wales

NAD27 Alaska

NAD27 Bahamas

North American 1927- Alaska

SW Base

Southwest Base- Faial, Graciosa, Pico,

Sao Jorge and Terceira Islands

North American 1927- Bahamas

(excluding San Salvador Island)

Pico De Las Nv

Potsdam

Canary Islands

Potsdam-Germany

Pitcairn Astro ‘67- Pitcairn

Taiwan

Modiﬁed Taiwan

NAD27 Canada

North American 1927- Canada and

Newfoundland

Ptcairn Ast ‘67

Timbalai 1948

Timbalai 1948- Brunei and E. Malaysia

(Sarawak and Sabah)

Prov S Am ‘56

Chile,Colombia,

Prov So Amricn ‘56- Bolivia,

Ecuador, Guyana, Peru, Venezuela

NAD27 Canal Zone

NAD27 Caribbn

North Am. 1927- Canal Zone

Tokyo

Tokyo- Japan, Korea, Okinawa

Tristan Astro 1968- Tristan da Cunha

User-deﬁned custom datum

Viti Levu 1916- Viti Levu/Fiji Islands

Wake-Eniwetok- Marshall

North American 1927- Caribbean

(Barbados, Caicos Islands, Cuba, Dom.

Rep., Grd. Cayman, Jamaica, Leeward

and Turks Islands)

Prov S Chln ‘63

Puerto Rico

Qatar

So Chilean ‘63- S. Chile

Puerto Rico & Virgin Isl.

Qatar National- Qatar

Qornoq- South Greenland

Reunion- Mascarene Island

Rome 1940- Sardinia Isl.

Sweden

Tristan Ast ‘68

User

Viti Levu 1916

Wake-Eniwetok

WGS 72

NAD27 Central

North American 1927-Central America

(Belize, Costa Rica, El Salvador,

Guatemala, Honduras, Nicaragua)

Qornoq

Reunion

World Geodetic System 72

World Geodetic System 84

Zanderij- Surinam

Rome 1940

RT 90

NAD27 CONUS

NAD27 Cuba

North Am. 1927- Mean Value (CONUS)

North American 1927- Cuba

WGS 84

Zanderij

Santo (Dos)

Santo (Dos)- Espirito Santo

NAD27 Grnland

North American 1927- Greenland

(Hayes Peninsula)

105

Download from Www.Somanuals.com. All Manuals Search And Download.

Battery Voltage High Please Check Connection— Input DC voltage is

too high for unit.

Appendix D

Battery Voltage Low Please Check Connection— Input DC voltage is

too low for unit.

Messages

Boat is Not Moving Fast Enough to Calibrate— Speed wheel is not

turning. Check for debris or boat speed is too slow.

The GPSMAP 178C uses an on-screen pop-up message system to alert

you to unit operating characteristics. Press the ENTER key to acknowledge

and return to the page you were viewing.

Database Error— Internal problem with the unit. Contact your dealer or

Garmin Customer Service (pg. iv) to have the unit serviced.

Deep Water Alarm— Speciﬁed deep water alarm depth has been detected

below transducer.

Alarm Clock— The alarm clock has sounded.

Alarm Voltage Set Too High— Voltage range must be between 10.0 and

35.0 volts for the GPSMAP 178C.

Lost Satellite Reception— The unit has lost satellite signals. Check

antenna connections or try moving to a location with a clear view of the sky.

Alarm Voltage Set Too Low — Voltage range must be between 10.0 and

Memory (RAM) Failed Unit Needs Repair— Internal problem with the

unit. Contact your dealer or Garmin Customer Service (pg. iv) to have the

unit serviced.

35.0 volts for the GPSMAP 178C.

Anchor Drag Alarm— You have drifted out of the speciﬁed distance

range.

Memory (ROM) Failed Unit Needs Repair— Internal problem with the

unit. Contact your dealer or Garmin Customer Service (pg. iv) to have the

unit serviced.

Antenna Input Shorted To Ground— Check antenna wiring/connections

or antenna replacement.

Approaching Waypoint— You are a speciﬁed alarm distance from a

destination waypoint.

No DGPS Position— No differential correction data is available or not

enough data is available to compute a DGPS position.

Arrival At Waypoint— You have arrived at the destination waypoint.

No Tide Stations For That Area— There are no tide stations within 100

miles of the speciﬁed point. Try another area.

Basemap Failed Unit Needs Repair— Internal problem with the unit.

Contact your dealer or Garmin Customer Service (pg. iv) to have the unit

serviced.

Off Course Alarm— You have exceeded the speciﬁed off-course distance.

Processor Failed Unit Needs Repair— Internal problem with the unit.

Contact your dealer or Garmin Customer Service (pg. iv) to have the unit

serviced.

Battery Alarm— Speciﬁed amount of input voltage has been detected.

106

Download from Www.Somanuals.com. All Manuals Search And Download.

Proximity Alarm List is Full— You have used all ten proximity

waypoints.

Appendix D

Proximity Alarm Waypoint— You have entered the alarm radius for the

proximity waypoint indicated.

Messages

Proximity Overlaps Another Proximity Waypoint—The alarm radius

speciﬁed overlaps the area speciﬁed for another proximity waypoint. Adjust

the distance.

Track Already Exists: <track name>— You have entered a saved track

name that already exists in memory. Modify the track name or delete the

previous track name.

Route Already Exists: <route name>— You have entered a route name

that already exists in memory. Modify the route name or delete the previous

route name.

Track Memory Is Full Can’t Create Track— Track log memory is full.

No additional track log data can be stored without deleting old data to

create memory space.

Route Does Not Exist: <route name>— Route has been renamed or

removed from memory and cannot be used.

Track Truncated— A complete uploaded track does not ﬁt into memory.

The oldest track log points were deleted to make space for the most recent

data.

Route Is Full— You have attempted to add more than 50 points to a route.

Reduce the number of points or create a second route.

Transducer Disconnected Sonar Turned Off— No transducer attached

Route Memory Is Full Can’t Create Route— Maximum amount of 50

routes is already in the unit’s memory and no additional routes can be

added until existing ones are removed.

or bad cable/transducer.

Transfer Complete— The unit has ﬁnished uploading/downloading infor-

mation to the connected device.

Water Speed Sensor is Not Working— Speed sensor is not detected.

Check connections.

Waypoint Already Exists: <waypoint name>— You have entered a

waypoint name that already exists in memory. Modify the waypoint name or

delete the previous waypoint name.

Route Truncated— An uploaded route from another device has more than

50 points. Reduce the number of points.

Running Simulator— The unit is in simulator (practice) mode.

Shallow Water Alarm— Speciﬁed shallow water alarm depth has been

detected below transducer.

Sonar Failed Unit Needs Repair— Internal problem with the unit.

Contact your dealer or Garmin Customer Service (page. iv) to have the unit

serviced.

Waypoint Memory Is Full Can’t Create Waypoint— You have used all

3000 waypoints available. Delete unwanted waypoints to make space for

new entries.

107

Download from Www.Somanuals.com. All Manuals Search And Download.

Avg Speed— The average of all second-by-second speed readings since last reset.

Bearing (BRG)— The compass direction from your present position to a destination waypoint.

Course— The desired course between the active ‘from’ and ‘to’ waypoints.

Appendix E

Navigation Terms

Distance (Dist)— The ‘great circle’ distance from present position to a destination waypoint.

Distance to Destination— The ‘great circle’ distance from present position to a Go To destination, or

the ﬁnal waypoint in a route.

Distance to Next— The ‘great circle’ distance from present position to a Go To destination, or the

next waypoint in a route.

Elevation— Height above mean sea level (MSL).

ETA— Estimate Time of Arrival. The estimated time you will reach your destination waypoint, based

on current speed and track.

ETA at Destination— The estimated time you will reach a Go To destination, or the ﬁnal waypoint in

a route.

ETA at Next— The estimated time you will reach a Go To destination, or the next waypoint in a route.

Fuel— The fuel required to travel from present position to the indicated route waypoint.

Leg Dist— The distance between two route waypoints.

Leg Fuel— The fuel required to travel from a route waypoint to the next waypoint (in sequence) in the

route.

Leg Time— The time required to travel from a route waypoint to the next waypoint (in sequence) in

the route.

Max Speed— The maximum second-by-second speed recorded since last reset.

Moving Average Speed— Average speed while the unit is moving.

Moving Trip Timer— Total time the unit has been moving.

108

Download from Www.Somanuals.com. All Manuals Search And Download.

Odometer— A running tally of distance travelled, based upon the distance between second-by-second

position readings.

Appendix E

Off Course— The distance you are off a desired course in either direction, left or right. Also referred

to as ‘cross-track error’ or ‘course error’.

Navigation Terms

Speed— The current velocity at which you are travelling, relative to a ground position. Also referred to

as ‘ground speed’.

DESTINATIO

WAYPOINT

Time To— The estimated time required to reach a Go To destination, or the next waypoint in a route.

Also referred to as ‘estimated time en route’.

Time to Destination— The estimated time required to reach a Go To destination, or the ﬁnal

waypoint in a route.

Time to Next— The estimated time required to reach a Go To destination, or the next waypoint in a

NORTH

route.

To Course— The recommended direction to steer in order to reduce course error or stay on course.

Provides the most efﬁcient heading to get back to the desired course and proceed along your route.

Track— The direction of movement relative to a ground position. Also referred to as ‘ground track’.

Trip Odometer— A running tally of distance travelled since last reset. Also see ‘Odometer’.

Total Average Speed— Average speed of unit for both moving and stopped speeds since last timer

reset.

Total Trip Timer— Total time the unit has been in operation since last reset of the trip timers.

'FROM'

WAYPOINT

Turn— The angle difference between the bearing to your destination and your current track. ‘L’ indi-

cates you should turn left, ‘R’ indicates you should turn right. The degrees indicate the angle you are off

course.

VMG— Velocity Made Good. The speed you are closing in on a destination along a desired course.

Also referred to as the ‘vector velocity’ to your destination.

109

Download from Www.Somanuals.com. All Manuals Search And Download.

Appendix F

The chart below gives an approximate UTC (Universal Time Coordinate) time offset for the various

longitudinal zones. Check with local charts for more detailed information. If you are in daylight

savings time, add one hour to the offset.

Time Offsets

Longitudinal Zone

E007.5º to E022.5º

E022.5º to E037.5º

E037.5º to E052.5º

E052.5º to E067.5º

E067.5º to E082.5º

E082.5º to E097.5º

E097.5º to E112.5º

E112.5º to E127.5º

E127.5º to E142.5º

E142.5º to E157.5º

E157.5º to E172.5º

E172.5º to E180.0º

Offset

Longitudinal Zone

Offset

-12

-11

-10

-9

W180.0º to W172.5º

W172.5º to W157.5º

W157.5º to W142.5º

W142.5º to W127.5º

W127.5º to W112.5º

W112.5º to W097.5º

W097.5º to W082.5º

W082.5º to W067.5º

W067.5º to W052.5º

W052.5º to W037.5º

W037.5º to W022.5º

W022.5º to W007.5º

W007.5º to E007.5º

-8

A simple way to determine your local time offset is how

many hours you are behind or ahead of UTC (also called

‘Greenwich’ or ‘zulu’ time).

-7

-6

Example: EST (Eastern Standard Time) is 5 hours behind

UTC, so your offset would be -5. Adding one hour for day-

light savings would make EDT (Eastern Daylight Time)

- 4. Subtract an hour for each time zone as you travel west.

-5

-4

+10

+11

+12

-3

Offsets for Continental U.S. would be:

EST

CST

MST

PST

-5

-6

-7

-8

EDT

CDT

MDT

PDT

-4

-5

-6

-7

-2

-1

110

Download from Www.Somanuals.com. All Manuals Search And Download.

Understanding Sonar

Appendix G

If you are unfamiliar with basic sonar, or need help determining what is displayed on the graph,

this section may be for you. This section is intended to help the novice user gain some understanding

of how the GPSMAP 178C operates and how it can help improve their ﬁshing productivity.

Understanding Sonar

To understand what the unit is displaying, it is important to have a general knowledge of how the

unit works and how it determines what to display. Brieﬂy described, the unit operates by transmitting

sound waves toward the bottom of a lake, stream or seabed in a cone shaped pattern. When a transmit-

ted soundwave strikes an underwater object such as the bottom, a piece of structure, or a ﬁsh, sound is

reﬂected back to the transducer. The transducer collects the reﬂected sound waves and sends the data

to the unit to be processed and displayed on the chart. The underwater data is displayed on the chart

in the order that it is returned: ﬁrst returned—ﬁrst on the chart. The diagram in the sidebar demon-

strates this showing an underwater scene as it would be displayed on the chart. Generally speaking, if

the only thing between the transducer and the bottom is water, the ﬁrst strong return comes from the

bottom directly below the transducer. The ﬁrst strong return sets the bottom level. Weaker secondary

returns provide the detailed data. Stronger returns displays in darker colors, black being the strongest

return. In Example 3 (page 113) you can see that the branches and the ﬁsh where the strongest second-

ary returns are indicated in black on the display.

This ﬁsh is currently in a dead zone and is not detected by

the sonar. The ﬁsh is in the coverage area of the transducer,

but remember– the ﬁrst strong return sets the bottom level.

The ﬁsh is eventually detected when the ﬁrst strong return

sets the bottom level below the ﬁsh.

That is brief description of how your GPSMAP 178C operates. Let’s take a look at how this data can

help you to improve your ﬁshing.

111

Download from Www.Somanuals.com. All Manuals Search And Download.

Appendix G

Transducer Coverage

The area covered by the transmitted sound waves is determined by the cone angle of the trans-

ducer and the water depth. Cone angles may vary between different types of transducers. For example,

a 50kHz frequency may provide a “wide” 40° cone angle, with a coverage width that is approximately

2/3 of the water depth. As shown in the sidebar, the 40° cone angle (50kHz frequency) approximately

covers the area of a 20 foot diameter circle at a 30 foot depth. A 200kHz frequency may provide a

“narrow” 10° cone angle, with a coverage width that is approximately 2/10 of the water depth. As

shown, the 10° cone angle (200kHz frequency) approximately covers the area of a 6 foot diameter

circle at a 30 foot depth.

Transducer Coverage

When using the GPSMAP 178C in ‘Dual’ frequency mode, the unit transmits both 50kHz and

200kHz signals at the same time. The ‘Dual’ frequency capability of the GPSMAP 178C allows you

to have a large coverage area and still retain good bottom resolution. When in ‘Dual’ frequency mode

the unit uses the narrow cone angle (200kHz) to display detailed bottom information, keeping “Dead

Zones” to a minimum, and the wide cone angle (50kHz) for the large coverage area.

Fish returns from the wide and narrow beams appears differently on the display. The wide beam

tends to show longer ﬁsh returns than the narrow beam.

200kHz - 10˚ Cone Angle

72" coverage at 30'

50kHz - 40˚ Cone Angle

20' coverage at 30'

Narrow Cone Angle

Wide Cone Angle

112

Download from Www.Somanuals.com. All Manuals Search And Download.

Understanding the Graph

Appendix G

It is important to understand that the unit does not display a 3-D representation of the underwater

environment. The unit can display multiple things at the same time, but cannot determine where the

return originated – only when it was received.

Understanding the Chart

Examples 1 and 2 provide a look at the underwater world from a top view, and illustrate how these

views would be displayed on the graph. On both graphs it appears the ﬁsh and tree are side by side

as shown in Example 1. However, when we look at Example 2, we see that the ﬁsh can be several feet

from the tree. It is important to remember that the sonar cannot determine where in the coverage area

the tree or ﬁsh are, only that the returns were received at the indicated depths in the same time frame.

Enlarged

Transducer

View

Enlarged

Transducer

View

Branches

Fish

Branches

Fish

)

Remember that the sonar displays a 2-D picture of the

underwater environment. The ﬁsh and tree could be

located anywhere in the coverage area at that time.

113

Example 1.

Example 2.

Download from Www.Somanuals.com. All Manuals Search And Download.

Whiteline

Appendix G

The GPSMAP 178C can help you to determine if the bottom is hard or soft. When the sonar

soundwaves are reﬂected back by the bottom, a hard bottom returns a stronger signal than a soft

bottom. A thin whiteline indicates a softer bottom while a thick whiteline indicates a harder bottom.

Normally, a red/dark line is used to show the point where water meets the bottom. This line follows

the bottom contour, along with any signiﬁcant objects lying on the bottom. The unit uses the whiteline

function to make this bottom layer information easier to distinguish.

With the GPSMAP 178C, active whiteline helps accentuate where strong signals are located, which

make bottom type determination easier. The example to the right shows the bottom return with and

without the whiteline activated.

Understanding the Graph

)

Whiteline can also help you to determine the type of bottom

structure that is displayed on the chart. By determining the

hardness of the structure, you can make a better informed

decision on the type of structure.

Structure is hard—

probably a rock or stump

Structure is soft—

probably a mud pile

Hard Bottom

Soft Bottom

Whiteline Turned Off

Whiteline

Example 4.

114

Download from Www.Somanuals.com. All Manuals Search And Download.

Thermoclines

Appendix G

One of the unique features offered by Garmin is See-Thru technology. See-Thru technology allows

the GPSMAP 178C to “see” through thermoclines and helps locate ﬁsh where they live; and ﬁsh love

thermoclines! A rough deﬁnition of a thermocline is a break in water where the water temperature

changes faster than the water above it. Thermoclines are shown as the weakest colors (see pg. 14)

Understanding the Graph

Thermocline

115

Download from Www.Somanuals.com. All Manuals Search And Download.

Appendix H

Physical Speciﬁcations

Size:

4.9" H x 6.3" W x 3.7" D (122.5mm x 157.5mm x 92.5mm)

Speciﬁcations

Weight:

Display:

1.0 lb 3.5oz.(.553Kg)

3.2” W x 3.2” H (81.28mm) CSTN (Color Super Twist Nematic) with adjustable

CCFL (Cold Cathode Fluorescent Lamp) backlighting; (320x320 pixels)

Case:

Fully gasketed, high-impact plastic alloy, waterproof to IEC 60529-IPX-7

Temp. Range: 5°F to 158°F (-15°C to 55°C)

Performance

Receiver:

Differential-ready 12 parallel channel WAAS capable receiver

Acquisition Times:

Warm:

Approx. 15 seconds

Approx. 45 seconds

Cold:

AutoLocate: Approx. 2 minutes

Update Rate:

GPS Accuracy:

1/second, continuous

Position*: <15 meters (49 feet), 95% typical*

Velocity: 0.05 meters/sec steady state

DGPS (USCG) Accuracy:

Position: 3-5 meters (10-16 feet) with optional Garmin DGPS receiver, 95% typical*

Velocity: 0.05 meters/sec steady state

116

Download from Www.Somanuals.com. All Manuals Search And Download.

DGPS (WAAS) Accuracy:

Position: <3 meters (10 feet), 95% typical*

Appendix H

Velocity: 0.05 meters/sec steady state

6g's

Speciﬁcations/

Unit Care

Dynamics:

* Subject to accuracy degradation to 100m 2DRMS under the U.S. DOD-imposed Selective Availability

Program.

UNIT CARE

Cleaning - The unit’s case is constructed of high quality

material and does not require user maintenance other

than cleaning. Clean the unit housing using a cloth lightly

dampened with a mild detergent solution and then wipe

dry. Avoid chemical cleaners and solvents that may damage

plastic components. Do not apply cleaner to electrical

contacts on the back of the unit.

Power

Source:

10-35 vDC

Usage:

Fuse:

8 watts max. at 13.8 vDC

AGC/3AG - 2.0 Amp

Storage - Do not store the unit where exposure to tempera-

ture extremes may occur (see left), as permanent damage

may result. User information, such as waypoints, routes,

etc. is retained in the unit’s memory, without the need for

external power. It is always a good practice to back up

important user data by manually recording it or download-

ing it to a PC (see pg. 86).

Water Immersion -The GPSMAP 178C is waterproof

to IEC Standard 60529 IPX7. It can withstand immersion

in 1 meter of water for 30 minutes. Prolonged submersion

can cause damage to the unit. After submersion, be certain

to remove the data card and dry the compartments before

reuse.

Sonar

Sounder Power: 500 watts (RMS), 4000 watts (peak to peak) with dual frequency transducer

400 watts (RMS), 3200 watts (peak to peak) with single frequency transducer

Frequency:

Depth:

50/200 kHz dual frequency; 200 kHz single frequency

1500 foot max depth (dual frequency)*

900 foot max depth (single frequency)*

* Depth capacity is dependent on water salinity, bottom type and other water conditions.

To resolve problems that cannot be remedied using this

guide, contact Garmin Customer Support in the U.S.A. at

800-800-1020 or Garmin Europe at 44-1794-519944.

117

Download from Www.Somanuals.com. All Manuals Search And Download.

Bearing Pointer 41

Beeper 83

Creating Waypoints 44-47, 50

Cursor 9, 13, 22-24

Appendix I

BlueChart 27, 28

Bottom Lock 34

Bottom Split 34

Customer Service i

Index

Data Cards 101

Accuracy 69

Data Card Maps 27

Data Fields 18, 30

Data Transfer 86, 87

Datum 85

Daylight Savings 86, 110

Declutter 31

Deep Water Alarm 91

Defaults 29, 40, 84

Deleting Routes 59

Deleting Tracks 76

Deleting Waypoints 49, 51

Depth Line 15, 36

Depth Number 38

Depth Units 85

Detail 27

DGPS 87, 88, 96

DGPS Alarm 90

Distance Units 85

DSC (Digital Selective Calling) 77

DSC Call List 80

DSC Directory 80, 81

DSC Distress Call 78, 79

Accuracy Alarm 90

Accuracy Circle 29

Active Route Page 19, 43, 64

Adjustments, Sonar 36

Adjustment Menu 15, 33, 34, 36

Alarm Tab 90, 91

Anchor Drag Alarm 90

Append to Route 47

Arrival Alarm 90

Calibrate Water Speed 39, 40

Capabilities v

Card Tab 82

Cautions iii

Celes Tab 74

Change Numbers 18, 30, 40, 43

Cleaning 117

Clock Alarm 90

Color, Sonar Background 39

Color Bar 39

Color Mode 27

Communications Tab 86-90

Compass Page 16, 41

Compass Page options 41

Compass Ring 16, 41

Contrast 1, 6

Copying Routes 59

Course Line 29

Course Up 27

ARROW KEYPAD 1

AutoLocate 71

AutoZoom 27

Background Color 39

Backlight 6

BACKLIGHT Key 1

Basemap 27

Battery Alarm 90

Bearing Line 29

Creating Map Waypoints 13

Creating Routes 57, 58

118

Download from Www.Somanuals.com. All Manuals Search And Download.

DSC Entry Review 80

DSC Log 80

Frequency 14, 15, 35

Full Screen Map 25

Appendix I

DSC Position Report 78, 79

DSC Setup 81

Index

DSC Simulation 82

DSC Tab 77-81

DSC Tabs 82

Gain 15, 35

General Tab 27

Going to a Destination 11, 53, 54

Go To 53

Interfacing 96

IN Key 1, 22, 24

Dual Frequency 14

Go To Point 11, 53

GPS Information Page 5, 6

GPS Status 5, 70

GPS Tab 68-71

Keel Offset 39, 40

Keypad 1, 2

Editing Routes 60-63

Editing Waypoints 48, 49

Elevation Units 85

Entering Data 3

ENTER Key 1

Erasing Tracks 75

Grids 84

Language 83

Lat/Lon Grid 29

Light Sectors 28

Loran TD 84, 102, 103

Loran TD Setup 103

Heading 85

Heading Line 29

Hide Numbers 37

Hide Pointer 37

Highway Page 17, 18, 42

Highway Page options 42

Highway Scale 42

How To Index viii

FCC Compliance ii

Find 65, 66

FIND Key 1, 65

Find Options 66

Fish Alarm 91

Fish Symbols 38

Flasher 39

Following Routes 58, 59

Follow Route 11

Follow Track 11, 54

Magnetic North 85

Main Menu 20

Main Menu Page 67

Main Menu Tabs 67, 68

Main Pages 8

Map, Set Up 26

Map/Sonar Split Page 14, 32

Initialize Position 71

Initializing 4

Installation 92-100

119

Download from Www.Somanuals.com. All Manuals Search And Download.

Moon Phase 74

Moon Rise/Set 74

Orientation 27

Other Tab 29

Appendix I

Mounting the Transducer 98, 99

Move Waypoint 47

OUT Key 1, 22, 24

Overzoom 24

Index

Moving Waypoints 49

MapSource 27

Map Cursor 9

Map Datums 85, 104, 105

Map Information Page 27

Map Item 11

Packing List vi

PAGE Key 1

Page Layout 19, 29, 40, 43

Pointer 37

Points Tab 28

Position Format 84

Power 4, 6

POWER Key 1, 21

Projecting Waypoints 46

Proximity Alarms 52

Proximity Waypoints 51, 52

Navaids, Set Up 28

Navaids Tab 28

Navigation Terms 108, 109

NAV Key 1, 53-56, 82

Nav Line Tab 29

Nearest To Boat 66

Nearest To Destination 66

Nearest To Next 66

Nearest To Other 66

New Waypoint 46

NMEA 86-90, 96

NMEA Interface 89

NMEA Output Setup 89

Noise Reject 15, 36

North Reference 85

North Up 27

Map Outlines 29

Map Page 8, 9, 22

Map Page Options 25

Map Scales 12, 24

Map Split Sonar Detail 39

Marking Position 44

Marking Waypoints 10

MARK Key 1, 44, 45

Measure Distance 26

MENU Key 1

QUIT Key 1

MENU key 20

Merge From Card 82

Messages 106, 107

MGRS 84

MMSI Number 77, 78, 81

MOB 56

Range 15, 34

Receiver Status 69, 70

Registration i

Replace From Card 82

Reset All 74

Numbers 30, 40

MOB Key 1, 56

Off Course Alarm 90

120

Download from Www.Somanuals.com. All Manuals Search And Download.

Reset Max Speed 74

Reset Odometer 74

Reset Trip 74

Retail Demonstration 7

Reviewing Routes 60

Reviewing Tracks 76

Reviewing Waypoints 48

Routes 57

Routes, Copying 59

Routes, Creating 57, 58

Routes, Deleting 59

Routes, Editing 60-63

Routes, Following 58, 59

Routes, Reviewing 58, 60

Routes, TracBack 54

Routes, Trip Planning 63

Route List Page 59

Serial Number, Electronic 84

Service iv

Setup Tab 83

Set 2D Elevation 71

Set Up Highway 43

Set Up Map 26

Set Up Page Layout 19, 29, 40, 43

Set Up Sonar 38

Shallow Water Alarm 91

Show Data 25

Show Numbers 37

Show Pointer 37

Signal Strength Bars 68

Simulated Tour 12

Appendix I

Index

Sonar Tab 38

Sonar Tab Options 38

Source Tab 27

Span 15, 35

Speciﬁcations 116, 117

Speed Filter 83

Speed Units 85

Split 34

Stop Navigation 11

Storage 117

Sun Rise/Set 74

Symbol Set 28

System Information 84

System Mode 83

System Tab 84

Simulator 71, 83

Simulator Mode 7, 11, 17

Simulator Set Position 83

Simulator Speed 84

Simulator Track Control 84

Simulator Transducer 84

Size Split 32, 37, 38

Skyview Orientation 74

Software License Agreement i

Software Version 84

Sonar, Set Up 38

Route Review Options 60

Route Review Page 60

Saved Tracks 76

Table of Contents vii

Target Level 15, 35

Temperature Graph 39

Temperature Scale 83

Temperature Tab 83

Savings Tracks 75

Scale, Highway 42

Scale, Map 24, 39

Scroll, Sonar 15, 36

Selecting Options 2

Serial Number iv

Sonar, Understanding 111-115

Sonar Page 14, 15, 33

Sonar Page Options 36

121

Download from Www.Somanuals.com. All Manuals Search And Download.

Transducer Coverage 112

Transfer Mode 87

Trip Data 74

Trip Planning 63

Trip Tab 74

Waypoints, Creating 10, 13, 24, 44-47, 50

Waypoints, Creating Underwater 37

Waypoints, Deleting 20, 49, 51

Waypoints, Editing 48, 49

Waypoints, Moving 47, 49

Waypoints, Projecting 46

Waypoints, Proximity 51

Waypoints, Reviewing 13, 48

Waypoints Tab 28

Appendix I

Index

Temperature Time Duration 83

Temperature Units 85

Thermoclines 115

Tides 72, 73

Turn Declutter On/Off 31

Tide Tab 73

Understanding Sonar 111-115

Understanding the Graph 113-115

Underwater Waypoints 37

Units 84, 85

Unit Care 117

User Datum 104

Time Format 86

Time Offsets 110

Time Zone 86

TracBack 54-56, 76

Tracks, Deleting 76

Tracks, Erasing 75

Tracks, Reviewing 76

Tracks, Saved 76

Waypoint List 50

Waypoint Menu Options 47

Waypoint Symbols 10, 48

Whiteline 15, 35, 114

Wiring 96

User Waypoint List 50

Zoom, Map 24

Zoom, Sonar 14, 15, 34

Tracks, Saving 75

Track Color 75

Track Interval 75

Track Logs 54, 55, 75

Track Record Mode 75

Track Tab 29, 54, 55, 75, 76

Track Up Below 27

Track Value 75

WAAS 69, 71

Warnings iii

WARRANTY iv

Water Immersion 117

Water Speed 39, 40

Water Temperature Alarm 91

Water Type 38

Transducers 97, vi

Transducers, Mounting 98, 99

122

Waypoints, Append to Route 47

Download from Www.Somanuals.com. All Manuals Search And Download.

For the latest free software updates (excluding map

data) throughout the life of your Garmin products,

visit the Garmin web site at www.garmin.com.

Garmin International, Inc.

1200 East 151^stStreet, Olathe, Kansas 66062, U.S.A.

Garmin (Europe) Ltd.

Unit 5, The Quadrangle, Abbey Park Industrial Estate,

Romsey, SO51 9DL, U.K.

Garmin Corporation

No. 68, Jangshu 2^ndRoad, Shijr, Taipei County, Taiwan

www.garmin.com

Part Number 190-00321-02 Rev. A

Download from Www.Somanuals.com. All Manuals Search And Download.

Echo Chainsaw CS 330T User Manual
Eureka Vacuum Cleaner 400 409 User Manual
Evolution Technologies Microphone E935 User Manual
Exmark Lawn Mower NAV20KC User Manual
Extron electronic Network Card HSA 200C User Manual
Fisher Price Doll B4341 User Manual
Franke Consumer Products Cooktop FDF 9044 I XS ECS User Manual
Frigidaire Dehumidifier FAD504DUD User Manual
Gainward DVD VCR Combo 7300GT User Manual
GE Washer S4200 User Manual