Garmin GPSMAP 190-00683-00, GPSMAP 478, GPSMAP 378 User Manual

GPSMAP 378/478

chartplotting receiver

Owner’s Manual

GPSMAP 478 shown

© 2009 Garmin Ltd. or its subsidiaries

Garmin International, Inc.
1200 East 151st Street,
Olathe, Kansas 66062, USA
Tel. [phone] or [phone]
Fax [phone]

Garmin (Europe) Ltd.
Liberty House
Hounsdown Business Park,
Southampton, Hampshire, SO40 9RB UK
Tel. [phone] (outside the UK)

Garmin Corporation
No. 68, Jangshu 2nd Road,
Shijr, Taipei County, Taiwan
Tel. [phone]

Fax [phone]
0808 2380000 (within the UK)
Fax [phone]

All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage
medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual onto a hard drive or
other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual must
contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Information in this document is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the content without
obligation to notify any person or organization of such changes or improvements. Visit the Garmin Web site (www.garmin.com) for current updates and supplemental
information concerning the use and operation of this and other Garmin products.

Garmin®, the Garmin logo, AutoLocate

®

, TracBack®, BlueChart®, City Select®, MapSource®, and See-Thru

®

are trademarks of Garmin Ltd. or its subsidiaries, registered in

the USA and other countries. These trademarks may not be used without the express permission of Garmin.

January 2009 Part Number 190-00683-00 Rev. C Printed in Taiwan

IntroductIon > About thIs MAnuAl

IntroductIon

Thank you for choosing the Garmin® GPSMAP® 378/478, which
utilizes the proven performance of Garmin GPS and full-featured
mapping to create an unsurpassed portable marine navigation
chartplotter and automobile navigation device. Take a moment to
compare the contents of this package with the packing list on the
outside of the box; if any pieces are missing, contact your Garmin
dealer immediately.

About This Manual

To get the most out of your new navigation system, take time to read
this manual and learn the operating procedures for your unit. This
manual is organized into the following sections:

The Introduction contains the Table of Contents, Care Information,
and Warnings.

The Getting Started section provides an overview of the unit, how
to turn the unit on, and how to simulate navigation.

The Marine Mode section provides you with information about
navigating with the GPSMAP 378/478 in Marine Mode.

The Marine Mode Pages section reviews the main pages in Marine
Mode.

The Automotive Mode section provides you with information about
navigating with the GPSMAP 378/478 in Automotive Mode.

The Automotive Mode Pages section reviews the main pages in
Automotive Mode.

The Main Menu section describes features found on the Main
Menu, and information on how to change settings.

The Using XM WX Weather section describes how to use XM WX
Satellite Weather features on your GPSMAP 378/478.

The Setting Up and Using Sonar section provides instructions
on using a Garmin GSD 20 or GSD 21 Sounder Module with your
GPSMAP 378/478.

The Appendix contains specications, optional accessories,
maintenance information, and other product information.

An Index is provided at the end of the manual for reference.

GPSMAP 378/478 Owner’s Manual i

IntroductIon > tAble of contents

Table of Contents

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

Caring for the GPSMAP 378/478 ........................................... iv

Warnings .................................................................................. v

Important Information ............................................................ vi

Battery Warnings .................................................................... vi

Getting Started .....................................................................1

Unit Overview .......................................................................... 1

Charging the GPSMAP 378/478 .............................................. 2

Turning On the GPSMAP 378/478 .......................................... 3

Getting Satellite Signals ......................................................... 4

Using the GPSMAP 378/478 Keypad...................................... 7

Using the GPSMAP 378/478.................................................... 8

Using Simulator Mode .......................................................... 12

Marine Mode .......................................................................13

Marine Mode Pages ............................................................... 13

Navigating to a Destination .................................................. 14

Finding an Item ...................................................................... 17

Creating and Using Routes .................................................. 20

Creating and Using Waypoints ............................................ 24

Managing Your Tracks .......................................................... 34

Marine Mode Pages ...........................................................38

Map Page ................................................................................ 38

Compass Page ....................................................................... 45

Highway Page ........................................................................ 48

Active Route Page ................................................................. 50

Position Data Page ................................................................ 51

XM Audio Page ...................................................................... 52

Automotive Mode ..............................................................56

Automotive Mode Pages ....................................................... 56

Navigating in Automotive Mode ........................................... 57

Editing Your Route ................................................................ 60

Following an Automotive Route ........................................... 63

Automotive Mode Pages ...................................................64

Map Page ................................................................................ 64

Current Route Page ............................................................... 65

Trip Computer Page .............................................................. 66

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

Main Menu Tabs ..................................................................... 67

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

Weather Tab ........................................................................... 68

XM Tab .................................................................................... 69

Route Tab ............................................................................... 70

Points Tab .............................................................................. 70

Track Tab ................................................................................ 71

DSC Tab .................................................................................. 71

Sonar Tab ............................................................................... 75

Alarms Tab ............................................................................. 76

Calendar Tab .......................................................................... 78

Celestial Tab........................................................................... 79

ii GPSMAP 378/478 Owner’s Manual

IntroductIon > tAble of contents

Message Tab .......................................................................... 83

Display Tab............................................................................. 84

Sound Tab .............................................................................. 85

Setup Tab ............................................................................... 86

Using XM WX Weather ......................................................95

Viewing XM WX Weather ....................................................... 95

Setting XM WX Weather Options ......................................... 95

Using the Weather Tab .......................................................... 98

Finding Weather Information.............................................. 101

Setting Up and Using Sonar ...........................................103

Showing Sonar on the Map Page ....................................... 103

Using the Sonar Page ......................................................... 104

Setting Up Sonar ................................................................. 108

Understanding Sonar .......................................................... 112

Appendix ..........................................................................115

Specications ...................................................................... 115

Optional Accessories .......................................................... 116

Installation Information ....................................................... 117

Satellite Information ............................................................ 122

What is Differential GPS (DGPS)? ..................................... 122

LORAN TD Setup ................................................................. 124

Map Datums and Location Formats .................................. 126

Digital Selective Calling (DSC) ........................................... 127

Messages ............................................................................. 129

Data Field Options ............................................................... 131

Software License Agreement ............................................. 133

Product Registration ........................................................... 133

Limited Warranty ................................................................. 134

Weather Data Warranty ....................................................... 135

XM Satellite Radio Service Agreement .............................. 136

FCC Compliance .................................................................. 137

Index .................................................................................138

GPSMAP 378/478 Owner’s Manual iii

IntroductIon > cArIng for the gPsMAP 378/478

Caring for the GPSMAP 378/478

The GPSMAP 378/478 case is constructed of high quality materials
and does not require user maintenance except cleaning.

Cleaning the Case

Clean the unit’s outer casing (except for the screen) using a cloth
dampened with a mild detergent solution and then wipe dry.
Avoid chemical cleaners and solvents that might damage plastic
components.

Storage

Do not store the GPSMAP 378/478 where prolonged exposure
to temperature extremes might occur (such as in the trunk of a
car) as permanent damage could result. User information, such as
waypoints and routes, 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 downloading it to a
computer (transferring it to MapSource).

Water Immersion

Cleaning the Screen

The GPSMAP 378/478 screen should be cleaned using a soft, clean,
lint-free cloth. Water, isopropyl alcohol, or eyeglass cleaner can be
used if needed. If these are used, apply the liquid to the cloth and
then gently wipe the screen with the moistened cloth.

The GPSMAP 378/478 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 wipe and air dry the unit before reuse or
charging.

iv GPSMAP 378/478 Owner’s Manual

Warnings

IntroductIon > WArnIngs

Failure to avoid the following potentially hazardous situations could
result in an accident or collision resulting in death or serious injury.

• When installing the unit in a vehicle, place the unit securely so that
it does not obstruct the driver’s view of the road or interfere with
vehicle operating controls, such as the steering wheel, foot pedals,
or transmission levers. Do not place in front of or above any airbag.
(See diagram.)

Do not mount

where driver’s

eld of vision is

blocked.

Do not mount in front of an airbag

eld of deployment.

Do not place

unsecured on

the vehicle

dashboard.

• When navigating, carefully compare information displayed on the
unit to all available navigation sources, including information from
street signs, visual sightings, and maps. For safety, always resolve
any discrepancies or questions before continuing navigation and
defer to posted road signs.

• Always operate the vehicle in a safe manner.

Do not become

distracted by the unit while driving, and always be fully aware
of all driving conditions. Minimize the amount of time spent

viewing the unit’s screen while driving and use voice prompts
when possible. Do not input destinations, change settings, or access
any functions requiring prolonged use of the unit’s controls while
driving. Pull over in a safe and legal manner before attempting such
operations.

• This unit is designed to provide route suggestions. It is not designed
to replace the need for driver attentiveness regarding road closures

or road conditions, trafc congestion, weather conditions, or other

factors that may affect safety while driving.

• Use the electronic chart in the unit only to facilitate, not to replace,

the use of authorized government charts. Ofcial government charts

and notices to mariners contain all information needed to navigate
safely.

• Use this unit only as a navigational aid. Do not attempt to use the
unit for any purpose requiring precise measurement of direction,
distance, location, or topography.

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 provided in accordance with California’s Proposition 65. See www.garmin.com/prop65 for more information.

GPSMAP 378/478 Owner’s Manual v

IntroductIon > IMPortAnt InforMAtIon And bAttery WArnIngs

Important Information

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 in product literature and copyright messages
displayed to the consumer. Virtually all data sources contain some inaccurate or
incomplete data. In some countries, complete and accurate map information is
either not available or is prohibitively expensive.

NOTICE REGARDING WINDSHIELD MOUNTING; SPECIAL
NOTICE TO DRIVERS IN CALIFORNIA AND MINNESOTA: State law

prohibits drivers in California and Minnesota from using suction mounts on
their windshields while operating motor vehicles. Check your state and local
laws and ordinances for similar restrictions. Other Garmin dashboard or friction
mounting options should be used. Garmin does not take any responsibility for

any nes, penalties, or damages that may be incurred as a result of disregarding

this notice or as a result of any other state or local law or ordinance relating
to use of the unit. (See California Vehicle Code Section 26708(a); Minnesota
Statutes 2005, Section 169.71.)

The California Electronic Waste Recycling Act of 2003 requires the
recycling of certain electronics. For more information on the applicability to
this product, see www.erecycle.org.

Battery Warnings

If these guidelines are not followed, the internal lithium-ion battery may
experience a shortened life span or may present a risk of damage to the GPS

unit, re, chemical burn, electrolyte leak, and/or injury.

• Do not leave the unit exposed to a heat source or in a high temperature

• Do not puncture or incinerate.

• When storing the unit for an extended time, store within the following

• Do not operate the unit outside of the following temperature range: -4°

• Contact your local waste disposal department to properly recycle/

Additional User-Replaceable Battery Warnings:

• Do not use a sharp object to remove the battery.

• Keep the battery away from children.

• Do not disassemble, puncture, or damage the battery.

• If using an external battery charger, only use the Garmin accessory

• Only replace the battery with the correct replacement battery. Using

location, such as in the sun in an unattended vehicle. To prevent
damage, remove the unit from the vehicle or store it out of direct
sunlight, such as in the glove box.

temperature range: 32° to 77°F (0° to 25°C).

to 131°F (-20° to 55°C).

dispose of the unit/battery.

approved for your product.

another battery presents a risk of re or explosion. To purchase a

replacement battery, see your Garmin dealer or the Garmin Web site.

vi GPSMAP 378/478 Owner’s Manual

gettIng stArted > unIt overvIeW

GettInG Started

Unit Overview

The GPSMAP 378/478 is an all-in-one, versatile color chartplotter and automobile navigator—perfect for land or water. This portable GPS
navigator features a 256-color TFT display that is easy to read in bright sun and includes built-in g2 cartography (GPSMAP 478) or built-in
lake cartography (GPSMAP 378), and preloaded City Navigator NT
With the optional GXM 30 antenna and a subscription to XM WX Satellite Weather, users have constant access to NEXRAD radar, lightning,
wind speed, wave direction, and more. In addition, the GPSMAP 378/478 offers XM Satellite Radio capabilities featuring more than 160
digital channels of commercial-free music; more than 30 channels of news, sports, talk, and entertainment; and more than 20 dedicated

channels of XM Instant Trafc & Weather.

GPS antenna

256-Color TFT display

with backlighting

Backlit keypad for easy nighttime operation

GPSMAP 378/478 Owner’s Manual 1

Detachable GPS antenna

collapses for storage.

Be sure the antenna is

up (as shown here)

to receive satellite

signals. See the

“Appendix”,

page 122, for

instructions on

removing the

External power

connector under

weather cap

antenna connector
under weather cap

®

to provide you with automatically generated turn-by-turn directions.

antenna.

USB/GXM 30

Battery pack. Press tab down

Slot for optional data card

to remove battery pack for
replacement, if necessary.

Serial number

Headphone/stereo jack

under weather cap

gettIng stArted > chArgIng the gPsMAP 378/478

Charging the GPSMAP 378/478

Before using the GPSMAP 378/478, you might need to charge
the battery. Plug the power cable into an external power source to

Using Charge Mode

If you want to charge the battery when you are not using the unit,
you can put the unit into Charge Mode.

charge. You can use the unit while it is charging.

To charge the unit’s battery:

1. Lift the rubber weather cap to expose the power connector
on the back of the unit. See the image on page 1 for
connector location.

2. Align the notches and push the plug into the connector until
fully seated.

3. Plug the 12-Volt adapter into an available AC outlet, or
cigarette lighter receptacle if you have a cigarette lighter
adapter. Use care when routing the cable; make sure it does
not interfere with vehicle operation. The unit begins charging
as soon as external power is applied.

TIP: Placing the unit in Charge Mode charges the unit more

quickly than when the unit is turned on, and reduces draw on the
vehicle/vessel battery.

Over time, you might notice that the lithium-ion battery in the unit
is not holding a charge any more. This is common for lithium-ion
batteries. Contact Garmin or your Garmin dealer to order a battery

When you turn on the GPSMAP 376C the power source indicator on

pack replacement if you are experiencing charging issues.

the GPS tab shows the unit is operating off battery power ( ),
that the unit is charging ( ), or that an external power source is
in use ( ).

NOTE: While in Charge Mode, the GPSMAP 378/478 draws a

small amount of current from the vessel/vehicle battery. To avoid
discharging the vehicle’s battery, disconnect the external power
cable from the unit when not in use for several days.

2 GPSMAP 378/478 Owner’s Manual

gettIng stArted > turnIng on the gPsMAP 378/478

Turning On the GPSMAP 378/478

Before you turn on the GPSMAP 378/478, be sure the antenna is up
as shown on page 1, and it has a clear and unobstructed view of the
sky to receive satellite signals.

The rst time you turn on your GPSMAP 378/478, the GPS receiver

must collect satellite data and establish its current location. To
ensure proper initialization, the GPSMAP 378/478 is shipped from
the factory in AutoLocate Mode, which allows the receiver to “nd

Adjusting the Backlight and Volume

You can adjust the backlight to see the screen better. If you are
using the external speaker with 12/24-Volt adapter cable with
the GPSMAP 378/478 or you have headphones plugged into the
headphone jack, you can adjust the volume level of the audio output.

To adjust the backlight level or volume:

1. Press and quickly release the POWER key.

2. Press up on the ROCKER to increase the brightness or

itself” anywhere in the world.

To turn the GPSMAP 378/478 on and off:

1. Press and hold the POWER key. When the unit turns on, a
tone sounds and the Warning Page opens.

Warning Page

2. Read the warning, and then press ENTER to continue.

3. To turn off the GPSMAP 378/478, press and hold the
POWER key again.

3. Press ENTER or QUIT to close the Backlight/Volume

press down to decrease. Press right to raise the volume or
left to lower.

adjustment window.

Battery time remaining and power source indicator

Backlight

adjustment slider

Volume

adjustment slider

GPSMAP 378/478 Owner’s Manual 3

gettIng stArted > gettIng sAtellIte sIgnAls

Getting Satellite Signals

After you turn on the GPSMAP 378/478, the unit automatically
begins searching for satellites. The GPS Page appears while the unit

is gathering satellite signals and acquiring a x, which should take

only a few minutes. While the GPSMAP 378/478 is getting satellite
signals, the GPS Page shows the status as “Acquiring Satellites.”

As the receiver locks onto satellites, a signal strength bar appears
for each satellite in view, with the appropriate satellite number
underneath each bar. The numbers below each bar represent the
particular satellite that is being received. Numbers above 33 indicate
WAAS satellites.

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 represents
45º above the horizon, and the center point represents a position
directly overhead. You can also set the sky view to a Track Up

conguration, causing the top of the sky view to align along your

current track heading. Press MENU to change the conguration of
the sky view.

GPS Tab

NOTE: While acquiring satellites, the Map Page might show

the wrong location, such as China. You need to wait a few more

minutes to acquire satellites and nd your current location.

Viewing GPS Status with the GPS Tab

The GPS tab provides a visual reference of satellite acquisition,
receiver status, and accuracy. The sky view and signal strength bars

Signal

strength bars

Sky view

GPS Page

Receiver

status eld

Power
source

indicator

show what satellites are visible to the receiver and whether they are
being tracked.

4 GPSMAP 378/478 Owner’s Manual

gettIng stArted > gettIng sAtellIte sIgnAls

The progress of satellite acquisition is shown in three stages:

•

No signal strength bars—the receiver is looking for the

•

satellites indicated.

White signal strength bars—the receiver has found the

•

satellite and is collecting data.

Green signal strength bars—the receiver has collected the

•

•

necessary data from this satellite.

When the GPSMAP 378/478 collects the necessary data from the

best satellites in view to calculate a x, the status eld indicates the

status of the receiver. The unit then updates the location, date and

•

time.

Receiver Status

•

The Receiver Status eld shows one of the following conditions:

•

Searching the Sky—the receiver is looking for satellites.

AutoLocate—the receiver is looking for any satellite whose

•

almanac was collected, which can take up to ve minutes.

Acquiring Satellites—the receiver is looking for and

•

• Simulating GPS—the receiver is in Simulator Mode.

•

collecting data from satellites visible at its last known or

initialized location but has not acquired a x.

2D GPS Location—At least three satellites were acquired

and a two-dimensional position x was calculated.

“2D Differential” appears when you are receiving DGPS
corrections in 2D mode, and a “D” appears on the strength bar
of satellites being corrected.

3D GPS Location—At least four satellites were acquired

and a three-dimensional x was calculated. “3D Differential”

appears when you are receiving DGPS corrections in
3D mode, and a “D” appears on the strength bar of satellites
being corrected.

Lost Satellite Reception—the receiver is no longer tracking

enough satellites for a 2D or 3D x.

Receiver Not Usable—the receiver is unusable, possibly due
to interference or abnormal satellite conditions. Turn the unit
off and back on to reset it.

GPS Off—the GPS receiver is turned off.

GPSMAP 378/478 Owner’s Manual 5

gettIng stArted > gettIng sAtellIte sIgnAls

GPS Options

Press MENU twice to open the Main Menu. Use the ROCKER to
highlight the GPS tab. Press MENU to open the options menu.

GPS Tips

While the receiver is gathering information, your location on the
map might appear different from where you are actually located.
As soon as the receiver gathers enough satellite information, your
proper location appears on the map.

Any time you have traveled more than 600 miles with the GPS
receiver turned off, the receiver might take longer than normal to

initialize and nd your location.

The GPS receiver can lose satellite signals due to interference from
such items as buildings, tunnels, and heavy tree cover. Monitoring
the GPS status is recommended.

Start/Stop Simulator—starts and stops Simulator Mode, which is
helpful when learning how to use your unit.

To learn about GPS, visit www.garmin.com/aboutGPS/.

Enable/Disable WAAS—enables or disables WAAS capability. See

page 124 of the “Appendix” for more information about WAAS.

Track Up Skyview/North Up Skyview—orients the sky view
display on the GPS Page to North up or Track up.

New Altitude—allows you to manually enter your altitude.

New Location—allows you to enter a new location automatically or

using the map.

6 GPSMAP 378/478 Owner’s Manual

gettIng stArted > usIng the gPsMAP 378/478 KeyPAd

Using the GPSMAP 378/478 Keypad

.

PAGE/MODE Key

• Press to cycle through main pages in sequence and

exit a submenu page.

• Press and hold to switch between Marine and

Automotive Modes.

QUIT Key

• Press to cycle through main pages in reverse

sequence, revert to the previous value in a data

entry eld, or cancel an unintended function.

ENTER/MARK Key

• Press to select a highlighted option.

• Press and hold to mark your current location as a

waypoint.

MENU/Wx Key

• Press to open the options menu for the current page.

• Press twice to show the Main Menu.

• Press and hold to toggle XM WX weather on or off
on the Map Page.

POWER Key

• Press and hold to turn the unit on or off.

• Press and release to adjust the backlighting and
external speaker volume.

GPSMAP 378/478 Owner’s Manual 7

IN Key/OUT Key

• Press to adjust map scale to show a larger area with
less detail (zoom out) or a smaller area with more
detail (zoom in).

ROCKER

• Press up, down, left, or right to highlight options
and to enter data, or use to pan the arrow on the
Map Page.

NAV/MOB Key

• Press to show the Navigate Menu.

• In Marine Mode, press and hold to start the MOB
function.

In Automotive Mode, press and hold to show the

Next Turn page and announce the next turn when
using the external speaker.

FIND Key

• Press to quickly search for and access user
waypoints, cities, and other items used for
navigation.

gettIng stArted > usIng the gPsMAP 378/478

Default—the factory setting saved in the unit’s memory. You

Using the GPSMAP 378/478

The advanced keypad system on the GSPMAP 378/478 is
designed to allow you to select options and enter data quickly and

•

can change the settings, and you can also revert to the factory
(default) settings when you select Restore Defaults.

conveniently. As you progress through this owner’s manual, you

are directed to press a specic key or highlight a eld on the screen.

Field

When you are directed to press a key, you should press and quickly
release the key. If the key needs to be held down for a period of time
to start a secondary function, the instructions will tell you to do so.

When a eld is selected on the screen, it is highlighted in yellow.

The following terms are used throughout this manual:

• Highlight

—move the highlighted area on the screen up,

down, left, or right with the ROCKER to select individual

elds. Moving the highlight to a given location allows you to

make a selection, begin data entry, or scroll through a list.

Field—the location on a page where data or an option can

•

be shown and entered. Select (highlight) a eld using the

ROCKER to begin entering data or selecting options.

On-screen button—use the ROCKER to highlight a button

•

and press ENTER to select the button.

Scroll bar—when viewing a list of items too long to appear

•

on the screen, a scroll bar appears along the right side of
the list. To scroll through a list, press up or down on the

Highlighted eld

Cartography

The GPSMAP 378 system contains preloaded U.S. inland freshwater
cartography to its enhanced worldwide basemap information.
The preloaded inland maps offer 50-meter shoreline resolution
throughout the US, with even more detailed 10-meter resolution on
select lakes. Other details include depth contours, tide and current
data, boat ramps, mile markers, hazards, marinas, campgrounds, area
roads, and more.

The GPSMAP 478 system contains preloaded marine map detail
utilizing BlueChart® g2 technology. Coverage is for US coastal
areas.

On-screen buttons

ROCKER.

8 GPSMAP 378/478 Owner’s Manual

gettIng stArted > usIng the gPsMAP 378/478

Selecting Options and Entering Data

To enter data and select options use the ROCKER to highlight,

select, or choose an item in a list or a eld on the screen. Use the

ENTER key and the ROCKER to select options, enter names and

numbers in data elds, and activate your selections.

To exit a menu or return to the previous setting:

Press QUIT. The QUIT key moves backward through your

steps. Press QUIT repeatedly to return to the starting page.

To select an on-screen button:

On a page with on-screen buttons, use the ROCKER to

highlight an on-screen button, and press ENTER.

To select and activate an option:

1. From any page, press MENU. An options menu shows a list
of optional features to that page.

On-screen

button

To mark your current location as a waypoint, press and hold
ENTER/MARK until the New Waypoint Page opens.

2. Use the ROCKER to move the highlight up, down, right, or
left on the menu to the option you want to select.

3. Press ENTER to select the feature. Another window with
more options might appear. If so, select an option and press
ENTER again.

GPSMAP 378/478 Owner’s Manual 9

To enter data in a data eld:

1. Use the ROCKER to highlight the data eld you want, and
press ENTER to edit it.

2. Press up or down on the ROCKER to select characters.
Press right to move to the next character or press left to
move back to the previous character. If there are two lines of
data, keep pressing right on the ROCKER to drop to the next
line.

gettIng stArted > usIng the gPsMAP 378/478

Restoring Default Settings

You can restore factory defaults for the following Main Menu tabs:

Entering

data

TIP: To clear the entire data eld, highlight the left-most

character eld and press left on the ROCKER again.

3. Press ENTER.

Not all elds are programmable. When you are on a page with elds

that are not selectable, the highlight skips over them.

Track, Alarms, Display, Sound, and Setup. For more information
about the Main Menu, see the “Main Menu” section beginning on

page 67.

To restore default settings:

1. Press MENU twice to open the Main Menu.

2. Use the ROCKER to highlight a tab, and then press MENU to
open the options menu.

Setup Tab Options Menu

3. Highlight Restore Default, and press ENTER.

10 GPSMAP 378/478 Owner’s Manual

gettIng stArted > usIng the gPsMAP 378/478

Using the Main Menu

Use the Main Menu on your GPSMAP 378/478 to access various
waypoint, system, navigation and interface management, and setup
menus. Press the MENU key twice from any page to open the Main
Menu. For more information, see the “Main Menu” section on

page 67.

Main Menu

By default, the Main Menu tabs are shown as icons along the left
side of the screen. You can change the Main Menu to show tabs in a
text-only format.

To view the Main Menu icons in text-only format:

1. Highlight the Display tab, and press ENTER.

2. Select the Main Menu eld. Press ENTER.

3. Highlight Text Only, and press ENTER.

To select a tab from the Main Menu:

1. From any page, press MENU twice to open the Main Menu.

2. Press up or down on the ROCKER to highlight a tab. The
information for the highlighted tab automatically appears
on the right. To highlight a sub tab, press left or right on the
ROCKER, and then press up and down to select individual

elds.

Display Tab

GPSMAP 378/478 Owner’s Manual 11

gettIng stArted > usIng sIMulAtor Mode

Using Simulator Mode

Simulator Mode is great for practicing with the unit if you are
indoors or when satellite signals are not available. All waypoints and
routes created in Simulator Mode are retained in memory for future
use.

By unplugging the GXM 30 antenna and placing the unit in
Simulator Mode, you can view simulated weather information.

NOTE: Do not try to navigate using Simulator Mode. When the

unit is set to Simulator Mode, the GPS receiver is turned off.
Any satellite signal strength bars shown are only simulations and
do not represent the strength of actual satellite signals.

To turn on Simulator Mode:

1. Highlight the GPS tab on the Main Menu.

2. Press MENU to open the GPS tab options menu.

3. Highlight Start Simulator, and press ENTER.

Entering a New Location

Use the GPS options menu to enter a new location from which to
simulate.

To enter a New Location using the map:

1. Highlight the GPS tab on the Main Menu.

2. Press MENU to open the options menu.

3. Highlight New Location, and press ENTER.

4. Highlight Use Map, and press ENTER.

5. Use the ROCKER to move the panning arrow to the location

GPS tab

Starting Simulator Mode from the GPS tab

you want on the map, and press ENTER.

12 GPSMAP 378/478 Owner’s Manual

MArIne Mode > MArIne Mode PAges

MarIne Mode

This section explains some of the more common operations you will perform with your GPSMAP 378/478.

To switch usage modes:

1. Press and hold the PAGE/MODE key. The Usage Mode Menu appears.

2. Use the ROCKER to select either Automotive or Marine, and press ENTER.

Marine Mode Pages

Marine Mode has ve main pages: Map, Compass, Highway, Active Route, and Position Data. An optional XM Audio Page can be enabled.

An optional Sonar Page is available when a GSD 21 is connected. See the “Setting Up and Using Sonar” section beginning on page 103 for
more information.

Map Page Compass Page Highway Page

Position Data Page Active Route Page XM Audio Page

(Optional)

GPSMAP 378/478 Owner’s Manual 13

MArIne Mode > nAvIgAtIng to A destInAtIon

Navigating to a Destination

You can navigate to your destination using the Map Page. As you

Navigate Options Menu

Press NAV to open the Navigate Menu.

travel, you see a magenta line that always runs from your current
location to the destination or to the next turn on the Map Page. You
can use the Map Page, Compass Page, Highway Page, and Position
Data Page to help navigate.

You can navigate to a destination using one of the following
methods:

• Select a point on the map and press NAV

• Press NAV

to start a new route using the Find Menu or start a

saved route or track.

• Press the FIND

key to search for a particular item and create

.

Go To Point—allows you to select a waypoint or point of interest
from the Find Menu to which to navigate.

a route to it.

Marine Mode and Automotive Mode are similar. Most of the
features discussed here also apply to Automotive Mode.

Navigate Route—allows you to select a route to navigate. You can
also start a saved route through the Routes tab on the Main Menu.
For information about routes, see page 20.

Navigate Track (TracBack)—allows you to select a saved track to
navigate. You can also start a saved track through the Track tab of
the Main Menu. For information about tracks, see page 34.

MOB (Man OverBoard)—creates a MOB waypoint and navigates
to that location. For more information about MOB, see page 16.

Navigate Menu in Marine Mode

14 GPSMAP 378/478 Owner’s Manual

MArIne Mode > nAvIgAtIng to A destInAtIon

To navigate (Go To) a point on the map:

1. On the Map Page, highlight a point to navigate to, and press
NAV.

2. Highlight Go To <point name>, and press ENTER.

Navigate Menu

3. Follow the magenta route created on the Map Page.

To stop navigation:

1. While navigating to a point, press NAV.

2. Highlight Stop Navigation, and press ENTER.

3. Highlight Resume Navigation, and press ENTER to resume
navigation.

To start a new route using the Find Menu:

1. Press the NAV key to open the Navigate Menu.

2. Highlight Go To Point (or New Route when in Automotive
Mode) and press ENTER to open the Find Menu.

3. From the Find Menu, highlight Waypoints and press ENTER.

4. Select a waypoint from the list, and press ENTER to open the
Waypoint Review Page.

Waypoint Review Page

5. With the Go To button highlighted, press ENTER to begin
navigation.

GPSMAP 378/478 Owner’s Manual 15

MArIne Mode > nAvIgAtIng to A destInAtIon

To search for an item and route to it:

1. Press FIND to open the Find Menu.

2. Highlight a category, and press ENTER.

3. Press ENTER and press the ROCKER up or down to enter
letters contained in the item name. Press ENTER when

nished.

Finding an item using the Containing eld: The unit searches for items
containing the letter combination you enter and shows them in the list.

4. Highlight the item from the list, and press ENTER.

5. Press ENTER when the Go To button is highlighted.

For complete information about nding an item, see the “Finding an

Item” section.

Man OverBoard (MOB)

Use the MOB function to simultaneously mark your current location
and create a direct route back to that location for quick response to
emergency situations.

To start the MOB function:

1. Press and hold the NAV/MOB key, or press the NAV/MOB
key twice.

2. Press ENTER to conrm and begin navigating to the MOB
location.

When a MOB is activated, a MOB waypoint with an international
MOB symbol is created, and the unit begins actively navigating 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
can be deleted like any other waypoint.

16 GPSMAP 378/478 Owner’s Manual

MArIne Mode > fIndIng An IteM

Finding an Item

Use the Find Menu to easily search for addresses, food & drink, fuel
services, lodging, banks/ATMs, cities, shopping, stored waypoints
and points of interest (POIs). To open the Find Menu, press the
FIND key.

The Find Menu is comprised of several default categories:
Waypoints, Cities, Exits, Transportation, Tide Stations, and Weather
Data. Additional categories appear depending on the optional
BlueChart g2 or MapSource data card in the unit.

Find Menu

Using the Find From Feature

You can use the Find Menu to center your search around an item
you just found. For example, you search for Restricted Areas and the
search shows an “Anchoring Prohibited” search result. If you press
FIND again, you will see “From Anchoring Prohibited” as the new
search from point. You can also use the Find feature to center your
search from any waypoint, route list entry, map item, or tide station.

To nd an item from another location on the map:

1 Open the Map Page. Use the ROCKER to pan the arrow

2. Highlight a category from the list, and press ENTER.

3. Highlight an item from the list, and press ENTER. The item’s

Follow the directions on page 15 to navigate a new route using the
Find Menu.

(pointer) to the location you want, and press FIND. The Find
Menu opens, showing “From Map Pointer.” The list of items is
sorted to show items nearest the selected location.

Information Page automatically opens, allowing you to
save the item as a waypoint, show the item on the map, or
automatically create a route to (Go To) the item.

GPSMAP 378/478 Owner’s Manual 17

MArIne Mode > fIndIng An IteM

To nd an item from another location:

1. From any page, press FIND.

2. Highlight a category from the list, and press ENTER.

3. Press MENU to open the options menu.

Find From Options Menu

4. Highlight Near Other and press ENTER. If you are actively
following a route, you can also choose one of the other
options listed in the Find From list.

5. Select a reference location on the map, and press ENTER.
The list shows items nearest to the new map location.

To nd an item near another item:

1. Press FIND. The Find Menu opens.

2. Highlight the item you want to “Find From.”

3. Press FIND. The Find Menu opens again with items near the
previously-selected item. Search for the item you want.

Viewing Recently Found Items

The Recently Found Page shows a list of the items you have
searched for or gone to recently.

To view recently found items:

1. Press FIND to open the Find Menu.

2. Highlight Recently Found, and press ENTER to open the list
of recently found items.

3. Press MENU to show the options menu.

4. Select Show Find History to view the list of items you have
searched for recently.

5. Highlight Remove Point, and press ENTER to delete the
selected recently found point.

18 GPSMAP 378/478 Owner’s Manual

MArIne Mode > fIndIng An IteM

Viewing the Information Page

Each item on the map and each item listed in the results list has an
information page.

To view details about an item:

1. Highlight a point on the map or in the search results list, and
press ENTER.

An information page appears with details about the item, in

a tabbed format. Depending on the type of item, additional
options are available for viewing the item on the map,
viewing a tide chart, viewing the list of maps on your data
card, and viewing the next item in the search results list.

Find Menu Options

To view additional Find Menu options, press FIND, and then press
MENU

• Enable

•

•

Additional selections are included in the options menu when you are
navigating:

•

•

Map Feature Information Page

•

2. Press PAGE or QUIT to exit the information page. You
can also highlight one of the on-screen buttons, and press
ENTER.

. The following options are available:

Auto Arrange—automatically arranges the Find

Menu. When selected, Disable Auto Arrange and Restore

Default options are available.

Near Other—select a new location from which to compile

the Find items lists. Using the ROCKER, move the map
arrow to the location you want, and press ENTER.

Map Information—shows information about the detailed
map data stored on the data card and allows you to select
which maps appear on the Map Page.

Near Next—compiles the Find items lists based on the next
turn in the route.

Near Destination—compiles the Find items lists based on the
route destination.

Near Current Route—compiles the Find items lists based on
the active route.

GPSMAP 378/478 Owner’s Manual 19

MArIne Mode > creAtIng And usIng routes

Creating and Using Routes

The GPSMAP 378/478 allows you to create and store up to 50
reversible routes, with up to 300 points each.

Creating a New Route

Use the Route tab to create a route by selecting waypoints from the
Find Menu, or by selecting waypoints or map items from the Map
Page.

To create a route using the Find Menu:

1. Highlight the Route tab on the Main Menu.

Route Tab with the Route List

2. Press MENU to open the Route options menu.

3. Highlight New Route, and press ENTER.

4. Press ENTER to nd items to add to the route.

5. Highlight OK, and press ENTER to add a route point.

6. Repeat step 5 to dene additional route points.

To create a route using the map:

1. Highlight the Route tab on the Main Menu.

2. Press MENU to open the Route options menu.

3. Highlight New Route, and press ENTER.

4. Press MENU to open the options menu.

5. Highlight Edit on Map, and press ENTER.

6. Highlight a location on the map, and press ENTER.

7. Repeat step 5 to dene additional route points

NOTE: If you select an area of the map that is not a

feature or waypoint, a new waypoint is created for that
location. Press ENTER on the New Waypoint Page to save
the location as a waypoint and continue adding points to
your route. You can edit the properties of this waypoint as
you can with any waypoint.

20 GPSMAP 378/478 Owner’s Manual

MArIne Mode > creAtIng And usIng routes

Navigating a Saved Route

Use the Navigate Route option to select and navigate a saved route.

Editing a Route

After you create a route, use the Route Review Page to edit, change
the name, and review route points of a selected route.

To navigate a saved route:

1. Press the NAV key.

2. Highlight Navigate Route, and press ENTER.

3. Highlight a route, and press ENTER.

Select a route

from list

To change the name of the route:

1. Highlight the Route tab on Main Menu.

2. Highlight the name of the route, and press ENTER.

3. With the Route Review Page open, highlight the route name

Enter a new
Route name

4. Use the ROCKER to enter the route name, and press

eld at the top of the page, and press ENTER.

here

Route Review Page

ENTER.

GPSMAP 378/478 Owner’s Manual 21

MArIne Mode > creAtIng And usIng routes

To review individual route points:

1. Highlight the Route tab on the Main Menu.

2. From the Route List Page, highlight the name of the route,
and press ENTER.

3. From the Route Review Page, highlight a point, and press
ENTER.

4. On the Point Review Page, choose Next (highlight the next
point on the route list), Show Map (show the point on a map
window), or Save (save the point as a waypoint), and press
ENTER. If the route point is a user waypoint, you can edit
any of the waypoint properties on the Waypoint Page (see
the “Creating and Using Waypoints” section beginning on

page 24 for details).

When you return to the Route Review Page, the next point in the
route is automatically highlighted. You can review each point on the
route by pressing ENTER repeatedly.

To add points to the route:

1. Highlight the Route tab on the Main Menu.

2. Select a route, and press ENTER.

3. Highlight the spot in the route that you want to add the new
point. (The new point is added before the highlighted route
point).

4. Press MENU.

5. Highlight Insert Waypoint, and press ENTER. The Find
Menu opens for you to search for and select the point you
want to add to the route.

Route Review Page

6. In the Point Review Page, highlight OK, and press ENTER to
add the new point to the route.

22 GPSMAP 378/478 Owner’s Manual

MArIne Mode > creAtIng And usIng routes

To edit the route on the map:

1. Highlight the Route tab on the Main Menu.

2. Select a route, and press ENTER. Press MENU to open the
Route Review Page options menu.

3. Highlight Edit on Map, and press ENTER.

4. Select a location on the route (the route turns red when the
arrow is over the route), and press ENTER.

5. Use the ROCKER to drag the route to the new point location,
and press ENTER.

Editing the route on the map

6. If the New Waypoint Page opens, edit the waypoint as
needed, highlight OK, and press ENTER.

7. Repeat steps 4 through 6 until all points are added to the
route. Press QUIT when nished.

To plan your route:

1. Open the Route Review Page options menu.

2. Highlight Plan Route, and press ENTER.

Entering Speed and Fuel Flow for trip planning

3. Enter the data for Speed and Fuel Flow. You also can enter
the date and time of your departure. Press QUIT to return to
the Route Review Page.

NOTE: Fuel ow rates are measured in “units per hour.” System

setting changes for units of measure (statute, nautical or metric)

do not affect the fuel ow measure. You should enter fuel ow

rates based on information for your vehicle/vessel (such as the

operator’s manual or performance specications), and make note

of the units of measure (gallons or liters).

You can enter information about your trip so the GPSMAP 378/478
can estimate information about your trip.

GPSMAP 378/478 Owner’s Manual 23

MArIne Mode > creAtIng And usIng WAyPoInts

Manually Transitioning to the Next Waypoint

From the Route tab option menu, highlight Set Up Routes, and
press ENTER to set the route leg transition (or waypoint transition).
Select Distance to enter a radius so that when you are within the
entered distance, the GPSMAP 378/478 leads you to the next point
on your route.

When you select Manual, you can transition to the next waypoint
anytime while navigating a route. While you are navigating
the route, open the Active Route Page, and press MENU.
Highlight Next Route Waypoint, and press ENTER to have the
GPSMAP 378/478 start routing you to the next point in your route.

Creating and Using Waypoints

Waypoints are locations or landmarks you record and store in your
GPS. They are locations you might want to return to later, such as
checkpoints on a route or signicant ground features. You can add
waypoints to routes and even create a Go To directly to the selected
waypoint.

The GPSMAP 378/478 stores up to 3,000 alphanumeric waypoints

with a user-dened icon, comment, elevation, depth, and

temperature available for each waypoint. You can create waypoints
using three basic methods:

• ENTER/MARK
location.

Graphically—allows you to dene a new waypoint location

•
from the map display using the ROCKER.

Text Entry—allows you to enter a new waypoint’s location

•
coordinates manually.

—allows you to quickly mark your present

24 GPSMAP 378/478 Owner’s Manual

MArIne Mode > creAtIng And usIng WAyPoInts

Marking Your Present Location

Use the ENTER/MARK key to capture your present location to
create a new waypoint. You must have a valid position (2D or 3D)

x to mark your present location.

To mark your present location:

1. Press and hold the ENTER/MARK key until the New
Waypoint Page opens, then release it. A default four-digit
name and symbol are assigned for the new waypoint.

New Waypoint Page

2. To accept the waypoint with the default information, highlight
OK, and press ENTER.

To change any information on the New Waypoint Page,

highlight the appropriate eld, and press ENTER. After
entering and conrming your changes, highlight OK, and

press ENTER.

Creating Waypoints Using the Map

You can quickly create a waypoint using the Map Page. When
you pan the map and move the arrow over a map item, you see a
highlighted description of that item. The GPSMAP 378/478 uses the
map item text shown on the map as the default name and symbol for
the new waypoint.

To create a new waypoint using the Map Page:

1. Use the ROCKER to move the arrow to the map location or
map feature you want.

2. Press and quickly release ENTER/MARK to capture the
location of the arrow. Pressing and holding ENTER/MARK
marks your current location, not the arrow’s location.

If you have highlighted a map feature, an information page

opens after you press ENTER. Highlight Save, and press
ENTER to save the item as a waypoint. The New Map
Waypoint Page opens.

3. To accept the waypoint with the default information, highlight
OK, and press ENTER.

To change any information on the New Map Waypoint Page,

highlight the appropriate eld, and press ENTER. After
entering your changes, highlight OK, and press ENTER.

GPSMAP 378/478 Owner’s Manual 25

MArIne Mode > creAtIng And usIng WAyPoInts

Creating a Waypoint by Entering Coordinates

To change any of the other information on the New Map

You can manually enter location coordinates to create a waypoint.

This method is useful for creating a waypoint at a specic latitude/

longitude position from a chart.

To create a new waypoint by entering location
coordinates:

1. Press ENTER/MARK to create a waypoint. The new
waypoint is created with the next available waypoint number
and the receiver’s last know location as the default location.

2. On the New Map Waypoint Page, highlight the Location
eld, and press ENTER.

3. Use the ROCKER to enter location coordinates, and press

ENTER when nished.

Reviewing a Waypoint

After you create and store a waypoint, you can modify, review,
rename, move, or delete it at any time using the Waypoint Review
and Waypoint Edit Pages.

To access the Waypoint Review Page:

Highlight a waypoint on the Map Page, and then press

Waypoint Page, highlight the appropriate eld, and press

ENTER. After entering your changes, highlight OK, and press
ENTER.

ENTER to open the Waypoint Review Page. If the waypoint

is located on a map feature or MapSource or BlueChart g2
feature, the Waypoint Review Page might include additional
tabs containing information about other features at that
location

Waypoint Review Page

26 GPSMAP 378/478 Owner’s Manual

MArIne Mode > creAtIng And usIng WAyPoInts

To access the Waypoint Edit Page:

1. Highlight the Points tab on the Main Menu, and then select a
waypoint from the list.

Points Tab

2. Press ENTER to open the Waypoint Edit Page.

NOTE: If the waypoint is located on a map feature or

MapSource or BlueChart g2 feature, the Waypoint Edit Page will
not show the details of the other map features.

Adding a Waypoint to a Route

Use the Append to Route option to add the selected waypoint
to the end of a route. This option is available only when you are
not navigating. When you are navigating to a destination, Add to
Current Route opens. The selected waypoint is added to the current
route before the route destination.

To add a waypoint to the end of the route:

1. Open the Waypoint Edit Page, and press MENU.

Waypoint Options Menu

2. Select Append To Route, and press ENTER. The Select
Route window opens.

3. Highlight a route or select New Route, and press ENTER.

4. Highlight OK, and press ENTER to save the waypoint.

GPSMAP 378/478 Owner’s Manual 27

MArIne Mode > creAtIng And usIng WAyPoInts

Averaging the Waypoint’s Location

Average Location makes the unit take several sample location
measurements for the waypoint and recalculate for a more accurate

Projecting a Waypoint

You can create a new waypoint by projecting the distance and

bearing from a specic location to a new location.

location reading.

To create a new waypoint by projecting its location:

NOTE: You must have a GPS satellite x before you can

average a waypoint’s location.

To calculate the average location:

1. Open the Waypoint Page, and press MENU.

2. Select Average Location, and press ENTER. The Average

Location window opens. The elds change as the unit

calculates the average location of the waypoint.

Average Location Page

3. Press ENTER to save the location.

1. Create a waypoint. The new waypoint uses the next available

2. Use the ROCKER to highlight Points from the vertical list of

3. Press MENU to open the New Waypoint Page options menu.

4. Highlight Project Location, and press ENTER.

5. To change the location from which you are projecting the new

waypoint number and the receiver’s last known location as
the default location.

tabs and select a waypoint. Press ENTER.

Project Location Menu

waypoint, highlight the From eld, and press ENTER.

28 GPSMAP 378/478 Owner’s Manual

6. Select the point that you will project your new waypoint
from, just as you would select a waypoint or point of interest.
For more information see the “Finding an Item” section on

page 17.

7. To adjust the distance that the new waypoint will be projected
beyond the original waypoint, highlight the Distance eld,
and press ENTER. Enter the projection distance, and press
ENTER.

To adjust the bearing that the new waypoint will be projected

from the original waypoint, highlight the Bearing eld, and
press ENTER. Enter the bearing, and press ENTER.

8. When you have adjusted all elements of the projected
location, highlight Save, and press ENTER.

9. Make any other changes to the new waypoint data (such as
the name or symbol); highlight OK, and press ENTER.

Editing a Waypoint

The User sub tab shows a master list of all waypoints stored in
memory. From the User list, you can review, edit, rename, or delete
individual waypoints or delete all user waypoints.

The number of stored and available waypoints is shown at the
bottom of the User sub tab. Stored waypoints are arranged in
alphanumeric order.

MArIne Mode > creAtIng And usIng WAyPoInts

User Points Tab

To navigate (Go To) a waypoint from the Points tab:

1. Select the Points tab on the Main Menu, and then highlight
the User sub tab.

2. Highlight the waypoint you want in the list.

3. Press NAV to open the Navigate Menu. Highlight Go To

<Point Name>, and press ENTER.

To edit the waypoint:

1. Open the Waypoint Review Page or Waypoint Edit Page.

2. Highlight the waypoint name, symbol, or eld you want to

change, and press ENTER.

3. Use the ROCKER to select a symbol or enter data, and
press ENTER when nished.

GPSMAP 378/478 Owner’s Manual 29

MArIne Mode > creAtIng And usIng WAyPoInts

Name eldSymbol eld

Waypoint Page

To edit the next waypoint in the list:

1. Highlight Next, and press ENTER. The Waypoint list appears
with the next waypoint highlighted.

2. Press ENTER to edit that waypoint.

Organizing Waypoints into Categories

You can organize your waypoints into categories, to help manage
your waypoints. For example, you can create a Vacation category
that stores all of the waypoints you will use for your vacation.
When the vacation is over, you can delete all the waypoints in that
category. You can create up to 15 categories.

To create a waypoint category:

1. From any of the waypoint pages or the Points tab, press
MENU to open the options menu.

2. Select Edit Categories, and press ENTER.

3. Highlight Add, and press ENTER.

Entering a new category

4. Use the ROCKER to enter a name for the category.

5. Highlight Save, and press ENTER.

To assign a category to a waypoint:

1. Open the Waypoint Edit Page. (You can also change the
category on the New Waypoint Page.)

2. Select the Category eld, and press ENTER.

3. Select the category to which you want to assign the
waypoint, and press ENTER.

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Select the

category to

which you want

to assign this

waypoint.

Waypoint Page

Deleting Waypoints

You can delete waypoints from the waypoint list on the Points tab
or from the Waypoint Page. To delete a waypoint from the Waypoint
Page, use the ROCKER to highlight the on-screen Delete button,
and press ENTER.

NOTE: When a waypoint is deleted from the list, it cannot

be recovered from the unit. Backup important waypoints to a
computer using the optional PC cable and interface software,
such as MapSource, or write them down by hand.

To delete a category:

1. With the Waypoint Categories window open, highlight the
category you want to delete, and press MENU.

Waypoint Categories Options Menu

2. Select Delete Category, and press ENTER.

3. Press ENTER again to nish deleting the category.

GPSMAP 378/478 Owner’s Manual 31

To delete a waypoint from the User Points tab:

1. From the Points tab, highlight the waypoint you want to
delete.

2. Press MENU, highlight Delete Waypoint, and press ENTER.

A conrmation message appears.

3. Press ENTER to conrm.

MArIne Mode > creAtIng And usIng WAyPoInts

To delete waypoints by symbol or category:

1. On the User sub tab, highlight the waypoint to delete, and
press MENU.

2. Highlight Delete by Symbol or Delete by Category, and
press ENTER.

3. When deleting by symbol, highlight the symbol of the
waypoint you want to delete, and press ENTER. When
deleting by category, select the category you want to delete
from the list, and press ENTER.

4. Highlight OK, and press ENTER to conrm. Choose Cancel
or press QUIT to exit without deleting the waypoint.

To delete waypoints by distance:

1. On the User sub tab, highlight the waypoint to be deleted,
and press MENU.

2. Highlight Delete By Distance, and press ENTER.

3. Select Less Than or More Than and enter the distance
using the ROCKER.

4. You can select a waypoint or point of interest as the From
location. Highlight the From eld and press ENTER. From
the Find Menu, select a location and press ENTER. When
OK is highlighted, press ENTER.

5. Highlight Delete and press ENTER to delete all waypoints
within the set location. Choose Cancel or press QUIT to exit
without deleting the waypoints.

Proximity Points

Use the Proximity Points tab to dene an alarm circle around a

stored waypoint location. The alarm circle can help you avoid reefs,
rocks, or restricted waters. Up to 100 waypoints can be listed with
a maximum alarm radius of 99.99 nautical miles, statute miles, or
kilometers.

If a proximity alarm circle overlaps an existing alarm circle, a
“Proximity Overlaps Another Proximity Waypoint” message
appears. Because the unit only alerts for one of the overlap points,
use caution when navigating in these areas. If you enter an alarm
circle overlap, you are only alerted to the closest proximity
waypoint.

To turn proximity alarms on or off:

1. Highlight the Points tab on the Main Menu, and then select
the Proximity sub tab.

32 GPSMAP 378/478 Owner’s Manual

MArIne Mode > creAtIng And usIng WAyPoInts

2. Highlight the eld below Proximity Alarm, and press
ENTER.

3. Select the On or Off setting, and press ENTER.

To add a proximity waypoint:

1. From the Proximity Points tab, use the ROCKER to highlight
an empty line on the Proximity list, and press ENTER. The
Find Menu opens.

2. Select a waypoint or point of interest from the Find Menu.

3. With OK highlighted, press ENTER to select the point.

4. Use the ROCKER to enter a distance value (up to 99.99
units), and press ENTER.

To clear one or all proximity waypoints from the list:

1. Highlight the Points tab on the Main Menu, and then select
the Proximity sub tab.

2. Highlight the proximity waypoint to clear, and press MENU.

Proximity Points Tab Options Menu

3. To clear a single alarm, highlight Remove Point, and press
ENTER. To clear all proximity waypoints, select Remove All,

and press ENTER.

4. Highlight OK, and press ENTER to conrm.

GPSMAP 378/478 Owner’s Manual 33

MArIne Mode > MAnAgIng your trAcKs

Managing Your Tracks

The GPSMAP 378/478 draws an electronic breadcrumb trail or
track log on the Map Page as you travel. The track log contains
points along its path, including time, and location for each point.

The track log starts recording as soon as the GPSMAP 378/478 gets

a location x. For the best results, clear the track log before you

start traveling because when the track log is full, new track points
overwrite the oldest track points.

Active Track Tab

The percentage of memory used by the current track log appears at
the top of the Active tab. After the track log is cleared, it shows zero
percent. When the track log reaches 100%, the most recent track

Record Mode—Wrap records over the oldest tracks when the track
log reaches 100%. Fill records a track log until the track log is full
(100%). When Off is selected, the unit does not record tracks.

points start to overwrite the oldest track points (if Wrap is selected
for Record Mode). To avoid losing track points, save the track log
when it approaches the 99% mark.

Interval—Distance records track points after a specied distance is
traveled. Time creates track points after a specied time has elapsed.
Resolution records track points based on the resolution. The higher

Setting Up and Saving Your Tracks

You must save the track log before you can use the Navigate Track
feature. The Save feature allows you to store up to 15 track logs

the resolution entered, the more points the unit creates to make the
track.

Color—select a color for the track when it appears on the map.

from certain times and dates.

Value—records a track according to the Interval and Value. Enter a

To access the Track tab:

1. Press MENU twice to open the Main Menu.

2. Highlight the Track tab.

34 GPSMAP 378/478 Owner’s Manual

specic distance, time, or resolution.

MArIne Mode > MAnAgIng your trAcKs

To clear the track log:

1. Highlight the Track tab on the Main Menu, then highlight the
Active sub tab.

2. Highlight the Clear button, and press ENTER. A conrmation
message appears.

Clearing the Track Log

3. Highlight OK, and press ENTER.

To save the entire track log:

1. Highlight the Track tab on the Main Menu, and then highlight
the Active sub tab.

2. Select Save, and press ENTER. A message appears asking
if you want to save the entire track.

3. Highlight Yes, and press ENTER.

To save a portion of the track log:

1. Highlight the Track tab on the Main Menu, and then highlight
the Active sub tab.

2. Select Save, and press ENTER.

3. Highlight No, and press ENTER when a message appears.

4. Select a beginning point, and press ENTER.

Saving a Portion of the Track Log

5. Select an ending point, and press ENTER.

6. Highlight OK, and press ENTER to save the track.

GPSMAP 378/478 Owner’s Manual 35

MArIne Mode > MAnAgIng your trAcKs

Saved Tracks

The Saved sub tab lists all of the saved tracks in your unit. Press
MENU to open the Saved tab options menu.

Saved Tab

• Review on Map—shows the highlighted track on the Map Page.

TracBack—navigates the track. You can either navigate the

•

track as it is saved, or you can navigate the track in reverse.

• Delete Track

memory.

• Delete All

—erases the highlighted track from the unit’s

—erases all tracks from the unit’s memory.

To edit a track:

1. Highlight the Track tab on the Main Menu, and then select
the Saved sub tab.

2. Select a track to edit, and press ENTER.

3. Highlight the Name eld, and press ENTER. Use the
ROCKER to change the name, and press ENTER.

4. Select a different display color to show the track on the map.

5. Highlight the box next to Show on Map, and press ENTER.

6. To begin a TracBack, highlight TracBack, and press ENTER.

7. To view the track on the map, highlight Map, and press
ENTER. Press QUIT to return to the Track tab.

8. Highlight OK, and press ENTER to save your changes.

36 GPSMAP 378/478 Owner’s Manual

MArIne Mode > MAnAgIng your trAcKs

Navigating a Saved Track

You can save your track log to use later as a TracBack, which
reduces your track log into a route with up to 300 turns. When
initiated, a TracBack route leads you back to the oldest stored track
log point. It is a good idea to clear the existing track log before you
start your current trip. Also, you must save an active track log before
you can navigate it as a TracBack.

TracBack Tips

When a TracBack is initiated, the GPSMAP 378/478 divides the
track into segments called legs. Up to 300 temporary turns are

created to mark the most signicant features of the track in order to

duplicate your exact path as closely as possible. To get the most out
of the TracBack feature, remember these tips:

• Always clear the

To start a TracBack using the NAV key:

1. Press NAV, highlight Navigate Track, and press ENTER.

2. Highlight the track you want to navigate, and press ENTER.

• The

• If the track log

• If the receiver is turned off or satellite coverage is lost during

• If the changes in distance and direction of your track are too

Selecting a Saved Track

3. Select the point you want to navigate to (TracBack to), and
press ENTER.

track log at the point that which you want to

go back (such as a dock or campsite).

Record Mode option on the Active Track tab must be set

to Fill or Wrap.

Interval option on the Active tab is set to the

Time option, the route might not navigate your exact path

(keep the interval set to Resolution for best performance).

your trip, TracBack draws a straight line between any point
where coverage was lost and where it resumed.

complex, 300 waypoints might not mark your path accurately.

The receiver then uses the most signicant points of your

track so there will be fewer changes in direction.

GPSMAP 378/478 Owner’s Manual 37

MArIne Mode PAges > MAP PAge

MarIne Mode PaGeS

The system has built-in BlueChart g2 charts. Optional Garmin data
cards and MapSource CD-ROMs enhance the versatility of your

Five pages are available in Marine Mode—Map, Compass,
Highway, Active Route, and Position Data. An optional XM Audio
Page can be enabled. A Sonar Page is available when a GSD 21

GPSMAP 378/478. With optional MapSource information and
BlueChart g2 you can view information for outside the US that is
not already preloaded.

Sounder Module is connected.

In Marine Mode, by default, ve user-selectable data elds appear

Map Page

When you turn on the GPSMAP 378/478, the Map Pages appears
after the unit acquires a satellite signal. The position marker ( )

on the right side of the screen that can be congured to show any

one of the possible data options. You can also add additional data

elds to the page or select a full screen map without data elds.

shows your current location on the map.

The Map Page shows map information (digital cartography) that
includes navaids, lakes, rivers, coastlines, cities, and highways. Use
the dedicated zoom keys (IN and OUT) to adjust the Map Page
scale.

Two map operating modes, Position Mode and Pan Mode, determine

Current

location

what cartography is shown on the map display. Position Mode
pans the map to keep your present location in the display area.
The position marker ( ) shows your travel on the Map Page. The
GPSMAP 378/478 always turns on in Position Mode, with the last
known location centered on the map. When you press the ROCKER,
the GPSMAP 378/478 enters Pan Mode, which moves the map to
keep the white arrow (map pointer) within the display area.

Map Page

Data elds

Map scale

38 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > MAP PAge

Changing the Page Layout andPage Layout and Data Fields

You can adjust how the following pages appear: Map, Compass,
Highway, Position Data, Trip Computer, and optional Sonar Pages.

You can also adjust the data elds on each page.

To change the map page layout:

1. Press MENU to open the options menu.

2. Highlight Set Up Page Layout, and press ENTER.

Selecting the Page Layout

3. Select a page layout option, and press ENTER.

To change a data eld display:

1. Press MENU to open the options menu.

2. Highlight Change Data Fields, and press ENTER.

3. Highlight the data eld to change, and press ENTER.

4. Highlight the type of data you want to show, and press

ENTER.

Changing a Data Field

5. Press QUIT to exit.

GPSMAP 378/478 Owner’s Manual 39

MArIne Mode PAges > MAP PAge

Setting Up the Map Page

Use the Set Up Map option to adjust how items appear on the Map
Page.

To change a map setup option:

1. On the Map Page, press MENU to open the options menu.

2. Highlight Set Up Map, and press ENTER.

Setting up the Map Page

3. Press left or right on the ROCKER to highlight a tab; press
up or down on the ROCKER to highlight the eld you want to
change, and press ENTER.

4. Highlight a setting, and press ENTER.

5. Press PAGE or QUIT to exit.

Viewing Additional Map Data

Use the Map Information Page to view the data currently loaded on
your GPSMAP 378/478 unit and data card.

To review/change map information:

1. On the Map Page, press MENU.

2. Highlight Map Information, and press ENTER. The rst

3. To change the setting for a map family, highlight the box next

page shows the map families stored on the data card and
unit and whether they are shown on the Map Page.

Map Family
highlighted.

Press ENTER

to view the

individual maps

in the family.

to the map family name, and press ENTER to select (check
mark) or deselect (no check mark) the Show setting.

NOTE: The outline of a check mark will appear if one or more

maps have been deselected within that map family.

4. To view the list of maps within a map family, highlight the
name of the map family, and press ENTER.

40 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > MAP PAge

5. When using a map loaded to a data card, you can view
detailed information about an individual map, highlight the
Map Name, and press ENTER. Highlight OK, and press
ENTER to exit the Map Information Page.

6. To select/deselect individual maps (data card maps only) to
be shown on the Map Page, highlight the box next to the map
you want, and press ENTER to check/uncheck the Show
box.
OR
Press MENU, select one of the options (Show All, Hide All,
or Show Defaults), and press ENTER.

7. Press QUIT to exit the Map Information Page.

Map Orientation

There are three map orientation options: North Up orients the map
like a paper map. Track Up orients the map in the direction of travel.
Course Up orients the map so the direction of navigation is always
up. When using Track Up or Course Up, the north arrow indicates
the orientation. To change the map orientation, press MENU to open
the Map Page. Press MENU again. Select Set Up Map, and press
ENTER.

Zooming In and Out of the Map

The map has 28 available map zoom ranges ranging from 20 ft to
800 nm (20 ft to 800 mi or 5 m to 1200 km). The map zoom range is
controlled by the IN and OUT keys, with the current range shown at
the bottom right of the data window.

NOTE: The range value represents the distance from one end of

the range bar ( ) to the other.

To select a map zoom range (zoom in and out):

Press the OUT key to zoom out; press the IN key to zoom in.

Both the GPSMAP 378 and GPSMAP 478 have a built-in worldwide
land database. The GPSMAP 378 contains detailed maps of the US
inland lakes and the GPSMAP 478 contains built-in BlueChart g2
charts. The GPSMAP 378/478 shows cartography as long as chart
information is available for the map zoom range you selected.

GPSMAP 378/478 Owner’s Manual 41

MArIne Mode PAges > MAP PAge

Map coverage conforms to the following conditions:

• Cartography is shown when the selected zoom range is
covered by either the internal basemap or other MapSource
data loaded onto a data card.

• When the selected zoom range is covered by both the internal

Panning the Map

Use the panning arrow to pan the map to view other map areas.
As you pan past the edge of the current map display, the screen
moves to provide continuous map coverage. The position icon
stays in your present location and might not be visible on the screen
when you pan the map.

database and data card map information, the cartography with
the best resolution appears.

• When the selected zoom range exceeds the resolution of the
data in use, “overzoom” appears below the map scale.

No additional data is available

To pan the map:

Press up, down, right, or left on the ROCKER. The panning

arrow moves the map so you can view different parts of the
map.

• When external data (such as MapSource data) is used, “detail
map” appears below the map zoom range.

Using external detailed maps

Map feature

highlighted

As you move the arrow, the distance and bearing from your present
location to the arrow appears in the data window, along with the
arrow’s position coordinates. When you zoom in Pan Mode, the
arrow stays centered on the screen. When the arrow is stationary,

xed coordinates appear in the position eld, and the distance and

bearing from your present location update as you move.

42 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > MAP PAge

To re-center your position on the screen:

Press QUIT. The map automatically moves to show your

present location, and the unit returns to Position Mode.

You can also use the arrow to select on-screen map items, which
allows you to review a selected item directly from the map.

To view details about an on-screen point:

1. Use the ROCKER to move the arrow to a waypoint or map
item. If several items are grouped closely together, zoom in
closer for a better view.

When a waypoint or map item is selected, it is highlighted on-

screen with the name and location shown at the top of the
screen, along with the distance and bearing from your current
location.

2. Press ENTER to view more information about the point. The
information and on-screen buttons shown vary depending
on the type of item selected. In some cases, additional
information tabs appear at the top of the information page or
Waypoint Page.

Clearing Unwanted Details from the Map

You can remove items from the Map Page (declutter the screen) to
remove unwanted items:

3. Use the
information.

4. Select an on-screen button and press ENTER. Press QUIT to
exit the information page.

ROCKER to highlight the extra tabs and view the

Map Feature Information Page

To declutter the Map Page:

1. On the Map Page, press MENU to open the options menu.

2. Highlight Declutter, and press ENTER.

3. Press ENTER again to restore the detail to the map.

GPSMAP 378/478 Owner’s Manual 43

MArIne Mode PAges > MAP PAge

Measuring Distance

4. Move the arrow to the point want to measure to. The bearing

You can measure the distance and bearing between two map items.

To measure the bearing/distance between two points:

1. On the Map Page, press MENU to open the options menu.

2. Highlight Measure Distance, and press ENTER. An on­screen arrow appears on the map at your present location
with ENT REF below it.

3. Move the arrow to the reference point (the starting point that
you want to measure from), and press ENTER. A push pin
icon marks the starting point.

indicating the

beginning

point of the

measurement

and distance from the reference point and arrow coordinates
appear in the data window at the top of the display.

End point of

measurement,

Push pin

Measure Distance

labeled ENT

REF

44 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > coMPAss PAge

Compass Page

During active navigation, the Compass Page guides you to your
destination with a graphic compass and a bearing pointer. When
the pointer is pointing straight up, you are heading directly to your
destination.

Rotating

compass ring

Course to steer

indicator

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, and then continue in that direction.

NOTE: You must be moving for the compass to accurately

Turning On the Compass Page

The Compass Page is on by default in Marine Mode but off by
default in Automotive Mode.

Compass arrow

Compass Page in Marine Mode

Data elds

To show the Compass Page in Automotive Mode:

1. Highlight the Display tab on the Main Menu.

2. Highlight the Compass Page eld, and press ENTER.

3. Select On, and press ENTER.

The middle of the page features a rotating compass ring that shows
your course over ground (track) while you are moving. Your present
course over ground is indicated at the top of the compass ring. The
direction of the destination (bearing) relative to the course over
ground is indicated by an arrow in the middle of the compass ring,
and a course to steer indicator on the outside of the compass ring.
The course to steer represents the direction to steer to get back to the
course line.

update and show your heading.

Turning on the Compass Page

GPSMAP 378/478 Owner’s Manual 45

MArIne Mode PAges > coMPAss PAge

Compass Page Options

Use the options menu on the Compass Page to customize the

Compass Page. For denitions of data eld options, see to page 132.

Press MENU to open the Compass Page options menu.

Set Up Page Layout—select the page layout.

Show Course Pointer/Show Compass—toggles between showing

the course pointer, which shows how far off you are from your
course and how to get back on course, or shows the compass arrow.
The course pointer is also referred to as a CDI or course deviation
indictor.

Show (Hide) Bug Indicator—shows the course to steer bug
indicator (the purple tick mark on the compass ring).

Using the Marine Timer

The Marine Timer, specically designed for sail boat racing, allows
you to easily count up or down by specied time increments. As

is common in sail boat racing, there is often a 5-minute warning
countdown, followed by a 4-minute preparation countdown, and

nally a 1-minute nal countdown. Then during the race, mariners

might want to count up to keep track of their time.

You can use your GPSMAP 378/478 to perform each of these
different countdowns.

To open the Marine Timer:

1. Press MENU on the Compass Page.

2. Highlight Set Up Page Layout, and press ENTER.

3. Highlight 2 Columns With Timer, and press ENTER. The
Marine Timer appears in the lower-right corner.

Change Data Fields—changes on-screen data elds.

46 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > coMPAss PAge

To use the Marine Timer:

1. Press the ROCKER up or down to select the time you want
to count. Five (5) minutes is the default.

2. Press ENTER to start the timer. Use the ROCKER during the
timing to quickly select a different length of time.

3. Press ENTER to stop timing.

Marine Timer on the Compass Page

As discussed previously, the timer is set to count down ve minutes.

If you want to change the length of time and the behavior of the
timer, open the Timers Setup tab on the Main Menu.

NOTE: You can set the timer countdown for up to 60 minutes.

To set the Marine Timer:

1. Highlight the Setup tab on Main Menu, and then select the
Timers sub tab.

2. Highlight Stop next to Marine to change the timer’s behavior.

3. Highlight the time eld, press ENTER, and then use the
ROCKER to enter a new time.

GPSMAP 378/478 Owner’s Manual 47

MArIne Mode PAges > hIghWAy PAge

Highway Page

The Highway Page is available in both Marine Mode and
Automotive Mode.

To hide/show the Highway Page:

1. Highlight the Display tab on the Main Menu.

2. Highlight the Highway Page eld, and press ENTER.

3. Select Off to hide or On to show, and press ENTER.

Using the Highway Page

To stay on course, steer toward the violet bar (or arrows) until
it lines up with the red bar in the middle. 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

When you are navigating, the Highway Page provides digital and
graphic steering guidance to the destination. The right side of the

Highway Page features user-selectable data elds showing useful

navigation information. A compass ribbon appears at the top of the
page to show your current heading, represented by the violet bar.
The red vertical bar represents the bearing to your course. To stay
on course, steer toward the red vertical indicator (or arrows) until it
lines up with the violet bar in the middle. The bottom 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.

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 black “road” with a white line down the middle, which is your
desired track line. Nearby waypoints not in the active route can also
be shown. You can zoom in or out to show a larger or smaller view
of the highway.

To change the highway perspective scale:

Press IN to zoom in; press OUT to zoom out.

48 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > hIghWAy PAge

Highway Page Options

Use the Highway Page options menu to dene the data elds and

select which waypoints and tracks appear on the screen. The data

The following options are available from the Highway Page options
menu:

Set Up Page Layout—select the page layout.

elds, located along the right side of the page, provide various types

of useful data.

To show and select the Highway Page options:

1. Press PAGE repeatedly until the Highway Page appears.

2. Press MENU.

3. Highlight an option, and press ENTER.

Highway Page Options Menu

Change Data Fields—change on-screen data elds.

Set Up Highway—shows an options menu with two sub tabs:
Line and Waypoint. Each tab has on/off settings for options,

including enabling the line for the Active Leg and Track Log.

Set Up Highway

GPSMAP 378/478 Owner’s Manual 49

MArIne Mode PAges > ActIve route PAge

Active Route Page

When you are navigating a route using your GPSMAP 378/478,

Active Route Page Options

Press MENU to open the Active Route Page options menu.

the Active Route Page shows each point (waypoint or map item) of
the active route, with the point name, course, distance, and several

other elds of information. The current destination point, the active

point, is marked with an arrow icon. As you navigate a route, the list
automatically updates to indicate the next active point. The Active
Route and Route Review Pages share many of the same features and
options.

Deactivate—stop route navigation.

Edit on Map—edit the route on the map.

Add Waypoint—insert a point before the highlighted waypoint or

add a point to the end of the route.

Remove Waypoint—delete the selected waypoint from the route.

Active Route Page

Invert—reverse the order of the route.

Plan Route—enter information about your route to more accurately

provide you with arrival times.

Change Data Fields—customize the data elds shown on the

Active Route Page.

50 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > PosItIon dAtA PAge

Position Data Page

The Position Data Page shows important navigation data while

Position Data Page Options

Press MENU to open the Position Data Page options menu.

navigating a route in Marine Mode. By default, the Position Data
Page shows a compass ribbon, your current latitude and longitude,
date and time, your location in relation to a prominent nearby
landmark such as a waypoint or city, and eight user-selectable data

elds. The compass ribbon appears at the top of the page to show

your current heading with a red, vertical bar. To stay on course, steer
toward the violet bar (or arrows) until it is aligned with the red bar.

Change Nearest Type—specify the type of item used as the nearest

Your present location

is 4.9 nm west of

Waypoint 0001.

item (shown in the lower-left data eld). The choices vary based on

the current usage mode.

Reset Trip—clear trip information, except the maximum speed and
the odometer.

Position Data Page

Reset Max Speed—clear the maximum speed.

Reset Odometer—clear the running total of the distance traveled

since the odometer was last reset.

Reset All—clear all trip information including the maximum speed
and odometer.

GPSMAP 378/478 Owner’s Manual 51

MArIne Mode PAges > XM AudIo PAge

XM Audio Page

Use the XM Audio Page to view and select XM Radio channels.
Add or remove channels within the Favorites category, and turn
audio on or off.

NOTE: You MUST have a GXM 30 antenna connected to your

GPSMAP 378/478 and a subscription to XM Radio to use XM
Radio features. Additionally, you must use the external speaker
with 12/24-Volt adapter, third-party FM modulator, speakers, or
have headphones plugged in to hear the audio.

Category

name

Channels

Artist name

Song title

Channel

number

Channel

name

XM Audio Page

Signal

strength

indicator

The XM Audio page is available in both Marine Mode and
Automotive Mode. The XM tab appears on the Main Menu, even if
the XM Audio Page is turned off.

The XM Audio Page is divided into three panes. The rst pane

contains a list of XM Radio categories into which XM Radio

channels are grouped (Classical, Decades, Trafc, and so on). For

a complete list of available categories and channels, visit the XM
Radio web site at www.xmradio.com. Select All Channels to view
a list of all channels in numerical order. You can also view a list of
your favorite channels.

The second pane shows a list of channels in the selected category.
Each channel has a description and the artist currently playing. You
can adjust this setting to show the song title instead of the artist.

The third pane shows the song and artist or program name, the
channel number and name, and the strength of the XM Radio signal.

52 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > XM AudIo PAge

Turning on the XM Audio Page

The XM Audio Page is off by default.

To show the XM Audio Page:

1. Highlight the Display tab on the Main Menu.

2. Highlight the XM Audio Page eld, and press ENTER.

3. Select On, and press ENTER.

XM Audio Page Field on the Display Tab

To select an XM Radio channel:

1. Press up or down on the ROCKER to scroll through the list of
channels.

2. Highlight the channel you want, and then press ENTER.
A triangle ( ) appears to the left of the channel currently
playing.

XM Audio Page Options

With the XM Audio Page open, press MENU to open the options
menu.

XM Audio Page Options Menu

The following options are available on the XM Audio Page options
menu:

Add to Favorites—allows you to add channels to the Favorites
category.

Scan—enables you to scan all channels, scan by category, or scan

favorites. Each channel plays for ve seconds before advancing to

the next channel in the list.

Display Artist (Display Song) In List—enables you to select
whether to show the artist or the song title in the channel list.

Mute (Enable) Audio Output—enables you to turn audio output on
or off.

GPSMAP 378/478 Owner’s Manual 53

MArIne Mode PAges > XM AudIo PAge

Using Favorites

You can create a customized list of up to 30 of your favorite XM
Radio channels.

To add a channel to Favorites:

1. Highlight the Category list, and press ENTER.

2. Select a category, and press ENTER, or use the IN and OUT
keys.

3. Select a channel.

4. Press MENU.

5. Highlight Add To Favorites, and press ENTER. Repeat
steps 1 through 4 to add another channel.

Adding a Channel to Favorites

To view and select Favorites:

1. Highlight the Category list, and press ENTER.

2. Select the Favorites category, and press ENTER.

3. Highlight the channel you want to select from your list of
favorites, and press
the newly selected channel.

Selected

channel

ENTER. A triangle appears to the left of

Favorites List

To delete a channel from Favorites:

1. In the Favorites category, highlight the channel you want to
delete, and press MENU.

2. Highlight Delete Favorite to delete the selected channel from
your favorites list, or highlight Delete All Favorites to delete
all channels from your Favorites list.

3. Press ENTER. A conrmation message appears.

4. Highlight OK, and press ENTER again to conrm.

54 GPSMAP 378/478 Owner’s Manual

MArIne Mode PAges > XM AudIo PAge

Scanning XM Radio Channels

Turning Audio On or Off

From the XM Audio Page, you can scan all channels, scan channels

in a specic category, or scan channels in your Favorites.

To scan XM Radio channels:

1. On the XM Audio Page, press MENU.

2. Select Scan on the options menu, and press ENTER.

3. Select All Channels to scan all channels.
OR
Select Category to scan only channels in the selected
category.
OR
Select Favorites to scan only channels in your Favorites list.

4. Press ENTER. Each channel is played for ve seconds and
then advances to the next channel.

5. Press any key to stop scanning and select the current
channel.

To turn audio on or off:

1. On the Audio sub tab, press MENU.

2. Highlight Mute Audio Output on the options menu to turn
the audio off. A music note with a red slash appears in the
song pane. Highlight Enable Audio Output to resume audio
output.

Audio output is muted

GPSMAP 378/478 Owner’s Manual 55

AutoMotIve Mode > AutoMotIve Mode PAges

autoMotIve Mode

This section discusses some of the more common Automotive operations you will perform with your GPSMAP 378/478 in Automotive
Mode. Please note that many common operations, such as marking a waypoint and creating a route, are performed the same way as in Marine
Mode. See the Marine Mode sections for operations and information not found in this section.

Automotive Mode Pages

Automotive Mode has two main pages (Map and Trip Computer) that are always available. Optional Highway, Compass, and XM Audio
Pages can be turned on in Automotive Mode. When you are actively navigating, the Current Route Page is available if you are navigating a
turn-by-turn route. The Active Route Page is available if you are navigating off road.

Map Page Optional Compass

Page (see page 45)

Current Route Page Trip Computer Page Optional XM Audio

Current Route Page Trip Computer Page

56 GPSMAP 378/478 Owner’s Manual

Optional Highway

Page (see page 48)

Page (see page 52)

AutoMotIve Mode > nAvIgAtIng In AutoMotIve Mode

Navigating in Automotive Mode

You can navigate to your destination in Automotive Mode using

Navigate Options Menu

Press NAV to open the Navigate Menu.

the Map Page. As you travel, your GPSMAP 378/478 guides you to
your destination with voice prompts, arrows, and directions along
the top of the screen. When you are actively navigating, you see
a magenta line that always runs from your current location to the
destination or to the next turn on the Map Page. You can use the
Map Page, Compass Page or Highway Page to help navigate.

You can navigate to a destination using one of the following
methods:

• Select a point on the map, and press the NAV

• Press the NAV

key to navigate a new route using the Find

Menu, or start a saved route or track.

• Press the FIND

key to search for a particular item and create

a route to it.

key.

Go To Point—select a waypoint or another point from the Find
Menu to which to navigate.

New Route—create a new route.

Custom Avoids—set up roads to avoid when navigating.

Detour—create a detour route while navigating.

Edit Vias—add points through which you want to travel when

navigating.

Navigate Route—select a route to navigate.

Navigate Menu

Navigate Track (TracBack)—select a saved track to navigate.

Stop (Resume) Navigation—start or stop navigating.

GPSMAP 378/478 Owner’s Manual 57

AutoMotIve Mode > nAvIgAtIng In AutoMotIve Mode

To navigate (Go To) a point on the map:

1. Highlight a point to navigate to, and press NAV.

2. Highlight Go To <point name>, and press ENTER.

3. Follow the magenta line created on the Map Page.

Stopping and Resuming Navigation

When navigating to a point, you can stop navigation. For example,
if you are on a long car trip, but you want to stop for dinner, you can
stop navigation and resume after dinner.

To stop navigation:

1. While navigating to a point, press NAV.

Navigate Menu

2. Highlight Stop Navigation, and press ENTER.

3. Highlight Resume Navigation, and press ENTER.

58 GPSMAP 378/478 Owner’s Manual

AutoMotIve Mode > nAvIgAtIng In AutoMotIve Mode

To create a new route:

1. Press NAV to open the Navigate Menu.

2. Highlight New Route, and press ENTER.

3. From the Find Menu, highlight Waypoints, and press

ENTER. (You can also choose to go to other points, such as
Cities or Exits from this list. The steps vary only slightly from

those listed for waypoints.)

4. Select a waypoint from the list, and press ENTER to open the
Waypoint Review Page.

Waypoint Review Page

Activating a Go To using the Find Menu

5. Highlight the Go To button, and press ENTER to begin
navigation.

To go to a destination using the Find Menu:

1. Press FIND to open the Find Menu.

2. Highlight a category, and press ENTER.

3. Press ENTER, and use the ROCKER to begin entering the
letters contained in the item name. The list begins to sort by
the items which contain the letters you are entering. Press

ENTER when nished.

4. Highlight the item you want from the list, and press ENTER.

5. Highlight the Go To button, and press ENTER.

For complete information about nding an item, see the “Finding an

Item” section on page 17.

GPSMAP 378/478 Owner’s Manual 59

AutoMotIve Mode > edItIng your route

Following a Saved Route

Use the Navigate Menu to follow a saved track or route. If you
want to follow roads on your route, press MENU and select Follow
Roads on the Active Route Page.

To follow a saved route:

1. Press NAV to open the Navigate Menu.

2. Highlight Navigate Route, and press ENTER.

3. Highlight the route you want to navigate, and press ENTER.

4. Press MENU to open the options menu.

5. Highlight Follow Roads, and press ENTER to create a
turn-by-turn route (auto-route), which appears on the Current
Route Page.

Editing Your Route

When you are navigating a route, you can edit that route. You can
add areas and roads to avoid as well as temporary detours to your
current route. You can also add stops along your trip, called Via
Points.

While navigating, press NAV to open the Navigate Menu.

You can also initiate a saved route from the Route tab on the Main
Menu.

Navigate Menu in Automotive Mode

While navigating a course

60 GPSMAP 378/478 Owner’s Manual

AutoMotIve Mode > edItIng your route

Entering Custom Avoids

The Custom Avoids feature allows you to enter specic areas and

roads to avoid when navigating. Custom Avoids apply to all routes,
but detours apply to only the active route. You can add Custom

Creating a Detour

If there is road construction or some other form of a detour while
navigating a route, you can have your GPSMAP 378/478 create a
detour route for you.

Avoids while you are navigating a route or before you navigate.

To enter a custom avoid:

1. Press NAV while navigating to a destination.
OR
Open the Map Page, and press MENU.

2. Select Custom Avoids, and press ENTER.

3. Press ENTER when the Add Avoid button is highlighted.

4. Select Avoid Road or Avoid Area, and press ENTER.

5. Use the ROCKER to move the arrow to the rst point in the
avoidance area. Press ENTER to select the rst point.

6. Move the arrow to the end point, and press ENTER. During
route calculation and navigation, the GPSMAP 378/478 will
avoid the area within the box or the selected area of the road.

7. When nished, highlight the OK button, and press ENTER.

To create a detour:

1. While navigating a course, press NAV.

2. Select Detour from the Navigate Menu.

3. Select a distance, and press ENTER. The GPSMAP 378/478
recalculates your course based on your detour distance.

4. To end the detour manually, press NAV again, and select
Cancel Detour.

GPSMAP 378/478 Owner’s Manual 61

AutoMotIve Mode > edItIng your route

Adding and Editing Stops (Via Points)

You can add Via Points—points through which you would like to
travel—to your route using the Edit Vias option.

To add Via Points to your route:

1. While navigating your route, press NAV to open the Navigate
Menu.

2. Select Edit Vias, and press ENTER. The Add/Edit Vias
window opens.

3. Highlight Add Via Point, and press ENTER.

Add/Edit Vias Page

Showing the original route without Via Points

4. From the pop-up window, highlight either Use Map or Use
Find Menu, and press ENTER.

5. If you selected
on the map, and press ENTER.

If you selected Use Find Menu, select an item from the Find

Menu as discussed in the “Finding an Item” beginning on

page 17. Remember you can press MENU while the Find

Menu is open to nd an item near another location, such

as the destination. The new point is added to the route as
shown on the Add/Edit Vias Page.

6. Repeat steps 3 through 5 until you have added all of the Via
Points that you want. Highlight Done, and press ENTER to
apply the new Via Points to the route.

Use Map, use the ROCKER to select an item

62 GPSMAP 378/478 Owner’s Manual

AutoMotIve Mode > folloWIng An AutoMotIve route

Following an Automotive Route

The GPSMAP 378/478 guides you to your destination using many
tools, such as the Map Page and Current Route Page.

Track Your Progress with the Map Page

You can track the progress of your route on the Map Page. Your
route is shown with a magenta line. The next turn is shown in the
top bar on the Map Page.

Watch Your Trip Data

Use the Trip Computer Page to view your trip data. You can track
your speed here, as well as other information related to your trip.

See Your Next Turn With the Current Route Page

Whenever you have initiated a turn-by-turn route in the
GPSMAP 378/478 set in Automotive Mode, the Current Route
Page shows each turn of the active route. For more information see

page 65.

Map Page Displaying Your Route

Current Route Page

GPSMAP 378/478 Owner’s Manual 63

AutoMotIve Mode PAges > MAP PAge

autoMotIve Mode PaGeS

Automotive Mode has two main pages, Map and Trip Computer,
that are always available. Optional Highway and Compass Pages
can be turned on in Automotive Mode. When you are actively
navigating, the Current Route Page is available if you are navigating
a turn-by-turn route. The Active Route page is available if you are
navigating off road. For information about pages not discussed here,
see the “Marine Mode Pages” section.

Current

location

Map Page

Data elds

Map zoom

range

Map Page

In Automotive Mode, by default, four user-selectable data elds

Some items on the map appear only if the map is zoomed in to a
certain level.

appear on the right side of the screen that can be congured to show

Press the zoom keys (IN and OUT) to change the map zoom range.

any one of the possible data options. The top of the screen shows the

GPS status or the route leg. You can also add data elds to the page
or select a full-screen map without data elds.

• Press ENTER

from the Map Page.

• Press MENU

to quickly declutter (remove unwanted items)

to open the options menu for the Map Page.

• Show and hide the heading line from the options menu.

• Use the

ROCKER to measure the distance between two

objects on the map.

• Change the page layout and data elds to customize the Map

Page.

64 GPSMAP 378/478 Owner’s Manual

Current Route Page

Whenever you start a route in the GPSMAP 378/478 in Automotive
Mode, the Active Route Page shows each turn of the active route,
with the distance to the turn, the street name, and estimated time
to arrival and time of arrival. As you navigate a route, the turn list
automatically updates to indicate the next turn at the top of the list.

Saving the Current Route

You can save the current route from the Current Route Page. Press
MENU to save the route. Press ENTER when Save Route is
highlighted. Your route is automatically saved, using the starting

Current Route Page

You can scroll through the entire list by moving the scroll bar up or
down. Highlight any of the turns on the list, and press ENTER to
view the Next Turn Page for that turn. The Current Route and Next
Turn Pages show similar information using a different layout. The
Next Turn Page shows your next turn on a map.

point and destination as the route name. Press ENTER when OK is

highlighted to nish saving the route.

AutoMotIve Mode PAges > current route PAge

Next Turn Page

GPSMAP 378/478 Owner’s Manual 65

AutoMotIve Mode PAges > trIP coMPuter PAge

Trip Computer Page

The Trip Computer Page shows important data while navigating a
route in Automotive Mode. It indicates your current speed and other

Trip Computer Page Options Menu

Press MENU to open the options menu. Highlight an option, and
press ENTER.

data about your trip, such as average speed and moving time.

Trip Computer Page

Reset the Trip Computer before beginning a trip. If you make
frequent stops, leave the GPSMAP 378/478 turned on in order to
receive satellites. This allows the unit to accurately measure elapsed
time during the trip.

Set Up Page Layout—choose the layout and number of data elds.

Change Nearest Type—allows you to specify the type of item to

be used as the nearest item [shown in the lower-left data eld of the

Position Data (2 Columns) layout]. The choices change based on
the current Usage Mode.

Reset (Trip, Max Speed, Odometer, All)—options to reset the
maximum speed, the odometer, everything but the max speed and
odometer, or reset everything in the trip computer.

Trip Computer Page Options Menu

66 GPSMAP 378/478 Owner’s Manual

MAIn Menu > MAIn Menu tAbs

MaIn Menu

The Main Menu provides access to various waypoint, system,
navigation and interface management, and setup menus.

Main Menu

To select a tab from the Main Menu:

1. From any page, press MENU twice to open the Main Menu.

2. Highlight the tab you want. The information for the highlighted
tab automatically appears on the right. To highlight a sub
tab, press left or right on the ROCKER, and then press up or

down to select individual elds.

Main Menu Tabs

• GPS—view satellite information.

• Weather

• XM

• Route

• Points

• Track

• DCS

• Sonar

• Alarms

• Calendar

for a specic day.

• Celestial

information.

• Message

• Display

• Sound

• Setup

—view individual weather features.

—view and select XM Radio channels.

—create and store routes.

—view stored waypoints.

—record and save tracks.

—set up digital select calling features.

—congure sonar options.

—dene alarm settings.

—view sun/moon and hunting/shing information

—view tide, hunting & shing, and sun & moon

—view system-generated messages.

—adjust backlighting and page display.

—customize GPSMAP 378/478 sounds.

—adjust system settings.

GPSMAP 378/478 Owner’s Manual 67

MAIn Menu > gPs tAb And WeAther tAb

GPS Tab

The GPS tab provides a visual reference of satellite acquisition,
receiver status, and accuracy. The sky view and signal strength bars
give an indication of what satellites are visible to the receiver and
whether they are being tracked. For more information about GPS,
see pages 4-6.

Weather Tab

Use the Weather tab on the Main Menu to view individual weather
features without turning all other weather features on or off. For
example, you can select Storm Cells to view only storm cells on
the Map window that appears on the Weather tab. When you close
the Main Menu and return to the Map Page, all of your previously
selected weather features still appear on the Map Page.

Main Menu—GPS Tab

For more information about XM Weather, see the “Using XM WX

Weather” section beginning on page 95.

NOTE: You must have a subscription to XM WX Weather, and

the GXM 30 antenna must be plugged into the USB port on the
back of the unit to use features described in this section.

Main Menu—Weather Tab

68 GPSMAP 378/478 Owner’s Manual

MAIn Menu > XM tAb

XM Tab

The XM tab is where you can view and select XM Radio channels,
add or delete favorites, and obtain radio ID and XM WX Weather
service level information. The XM tab is divided into two sub tabs:
Audio and Information.

Information Sub Tab

Use the Information sub tab to view the radio identication number,

XM WX Weather subscription information, and a list of weather
features available to you based on your subscription plan. The
Information sub tab also shows the age of each weather report in
minutes.

NOTE: The XM tab always appears on the Main Menu,

regardless of whether the XM Audio Page is turned on or off.

Radio ID

For more information about the XM Audio Page, see page 52.

Subscription

package

Available

weather

products

Information Sub Tab

Age of

weather
report (in
minutes)

For more information about XM Weather, see the “Using XM WX

Weather” section beginning on page 94.

Artist name

Song title

Channel

number

Channel

name

Channels

Main Menu—XM Tab

Category name

Signal

strength

indicator

Audio Sub Tab

The Audio sub tab shows XM Radio channel categories, a list of
available channels, information about the selected channel, and the
strength of the XM signal.

GPSMAP 378/478 Owner’s Manual 69

MAIn Menu > route tAb And PoInts tAb

Route Tab

The Route tab shows all the routes currently stored in memory,
along with a descriptive name for each route.

Use the Route tab create and store up to 50 reversible routes, with
up to 300 points each. See the “Creating and Using Routes” section
beginning on page 20 for more information about routes.

Main Menu—Route Tab

Points Tab

The Points tab contains two sub tabs, User and Proximity, which
allow you to manage a large number of waypoints quickly and
efciently. For more information about waypoints, see the “Creating

and Using Waypoints” section beginning on page 24.

User Sub Tab

The User sub tab shows a master list of all waypoints currently
stored in memory. The total number of stored and available
waypoints appear at the bottom of the User sub tab.

Proximity Sub Tab

Use the Proximity sub tab to dene an alarm circle around a stored

waypoint location.

Main Menu—Points Tab

70 GPSMAP 378/478 Owner’s Manual

MAIn Menu > trAcK tAb And dsc tAb

Track Tab

Use the Track tab to specify whether or not to record a track log,

dene how it is recorded, or save the track log data for future use.

The Track tab is divided into two sub tabs: Active and Saved. For
more information about tracks, see the “Managing Your Tracks”
section beginning on page 34.

Main Menu—Track Tab

DSC Tab

Use the DSC tab (Marine Mode only) to control and set up the
Digital Selective Calling (DSC) features. DSC uses marine VHF
radio and GPS to transmit and receive location information. DSC is
used by mariners for distress calls and position reporting.

For more information about DSC and Maritime Mobile Service
Identity (MMSI) numbers, see pages 128-129 in the “Appendix.”

Active Sub Tab

The Active sub tab is for the active log (the log currently being
recorded). It shows the amount of track memory used and current
settings.

Saved Sub Tab

The Saved sub tab shows a list of all saved tracks in your
GPSMAP 378/478.

DSC Page

GPSMAP 378/478 Owner’s Manual 71

MAIn Menu > dsc tAb

Understanding Distress Calls

With your GPSMAP 378/478 properly connected to a VHF radio
with DSC output, you can receive any DSC distress call within
range. An alert message appears and a tone sounds when a distress
call is received. The alarm only sounds on a distress call; position
reports do not sound the alarm. Distress calls are broadcast to
all DSC users in radio range and appear with a blue and white
checkered icon on the DSC Call List and Log tabs.

Each entry in the Call List and Log has a corresponding DSC Entry
Review Page. This page operates similarly to the Distress Page and
Position Report Page. From the DSC Entry Review, you can Delete
the entry, Save it as a waypoint, or show the location on the map.

To review a call or log entry:

1. Open the Call List or Log from the DSC tab.

2. Highlight the call you want to review.

3. Press ENTER to open the DSC Entry Review Page.

You can enter a caller’s name, if it is known. The caller’s name
replaces the MMSI number as a reference once entered.

Understanding Position Reports

The Position Report operates similarly to the distress call. This type
of contact is like a phone call; no emergency alarms are set off.
Position reports are not broadcast to all DSC users and appear with a
gold boat icon.

Receiving DSC Calls

Each time you receive a distress call or position report, a review
page opens—either a DSC Position Report Page or a Distress Call

Page. Both pages contain identical elds to the DSC Entry Review

Page.

DSC Entry Review Page

72 GPSMAP 378/478 Owner’s Manual

DSC Call List

The Call List sub tab shows the 50 most recent calls, even if the unit
is left unattended. The Call List only shows the most recent call from

a vessel. If a second call is received, it replaces the rst call in the Call

List. Press MENU to sort the list and delete entries.

DSC Call List

MAIn Menu > dsc tAb

DSC Log

Receiving a Position Report or Distress Call

After you receive a Position Report or a Distress Call, you can
quickly navigate to the location. Highlight a call from the Call List
or Log and press Direct To. The top selection in the Navigate Menu
is highlighted. Press ENTER to go to the location.

DSC Log

When DSC calls are received, they are automatically stored in the
Log, with the latest call at the top. The unit can store up to 100 calls;

DSC Directory

The DSC Directory is like a phone book and can hold up to 50
entries.

after 100 calls are received, the oldest log le is removed when a

new call is received.

GPSMAP 378/478 Owner’s Manual 73

MAIn Menu > dsc tAb

DSC Directory

entries. Press

to

ENTER

open the Entry

Review Page.

Blank entry.

Press ENTER to

add a Directory

entry.

Enter the

MMSI number,

name, and a

comment (if

needed) in the

elds.

Highlight OK,

and press

ENTER to save

the Directory

entry.

DSC Directory list

To add a new Directory entry:

1. Open the DSC Directory on the Main Menu.

2. Highlight the rst blank space in the directory list, and press

ENTER.
OR
Press MENU, highlight New Item, and press ENTER.

3. Enter the MMSI number, the name, and any comments.

After creating a New Directory Item, the name created is attached
to that particular MMSI number. If you return to the Log, the new
name appears under the corresponding MMSI number.

Another way to input a name is from the Entry Review Page or the
DSC Distress Call Page or DSC Position Report Pages. The Name
and MMSI are sent to other Garmin GPS units: Only the MMSI
numbers are sent to other non-Garmin DSC users.

New Directory Item Page

4. When nished, highlight OK, and press ENTER.

Making a Distress Call

To make a distress call, press the MayDay button on your VHF
radio. The call transmits on an emergency channel with the MMSI
number attached to the call, if you have DSC support. Any DSC­equipped mariner (on sea or land) within range can receive the call.

74 GPSMAP 378/478 Owner’s Manual

MAIn Menu > sonAr tAb

Setting Up DSC

Use the Setup sub tab to turn DSC on and off. If you have more than
one chartplotter and only want DSC to show on another chartplotter,
turn DSC off on this unit.

Sonar Tab

Use the Sonar tab contains options for the Sonar Page. See the
“Setting Up and Using Sonar” section beginning on page 103 for
more information about sonar setup options.

This Setup sub tab also allows you to simulate distress calls and
position reports while the unit is in Simulator Mode (see page 12).
Simulating calls is helpful for practice before connecting to the real
system. The Distress Call simulator also helps to check if alarms are
working properly.

DSC Setup

NOTE: You must have a GSD 21 Sounder Module connected to

your GPSMAP 378/478 to use sonar.

Main Menu—Sonar Tab

GPSMAP 378/478 Owner’s Manual 75

MAIn Menu > AlArMs tAb

Alarms Tab

Use the Alarms tab to dene alarm settings. When an alarm goes off,

the alarm message appears on the GPSMAP 378/478 and the unit

To set a persistent alarm:

1. Highlight the Alarms tab on the Main Menu.

2. Highlight the box next to the alarm you want to make

emits ve (5) beeps.

3. Press ENTER to place a check mark in the Persist box.

Navigation (Nav) Alarms

The Nav sub tab contains the following alarms:

Next Turn—sets an alarm to indicate the next turn in a route. Select
Dist to specify a distance before you reach the next turn to sound the

alarm. Select Time to specify a time before the turn for the alarm to
go off. Select Auto for the unit to provide a Next Turn alarm at its

Main Menu—Alarms tab

To set an alarm:

1. Highlight the Alarms tab on the Main Menu.

2. Select an alarm to set, and press ENTER.

3. Change the setting to On, and press ENTER. If necessary,
highlight the next eld to the right, and press ENTER. Enter
the settings you want.

4. Press ENTER to nish.

When you set an alarm to be persistent, the alarm message appears
on the screen and the unit beeps until you press ENTER to
acknowledge the alarm.

discretion.

Arrival—sets an alarm to sound when you are a specied distance

or time away from a destination waypoint. Select Auto for the unit
to provide an Arrival alarm at its discretion.

Off Course—sets an alarm to sound when off course. Select On,
then enter a distance.

Anchor Drag—sets an alarm to sound when you exceed a specied
drift distance. Select On, and then enter a distance.

persistent.

76 GPSMAP 378/478 Owner’s Manual

MAIn Menu > AlArMs tAb

System Alarms

Clock—sets an alarm based on the unit’s clock. Select On, and

then enter a specic time that you want the alarm to sound. The

GPSMAP 378/478 must be on for the clock alarm to work.

Ext. (External) Voltage—sets an alarm to sound when the external

voltage drops below a specied amount. Select On, and then enter a
specic voltage.

DGPS—sets an alarm to sound when the GPSMAP 378/478 loses a

differential x.

Accuracy—sets an alarm to sound when GPS accuracy falls outside
of the user-set value. Select On, and then specify a distance.

Weather Alarms

Tornado Warnings—sets an alarm to sound when you enter an area
where a tornado warning is in effect.

Thunderstorm Warnings—sets an alarm to sound when you enter
an area where a severe thunderstorm warning is in effect.

Flood Warnings—sets an alarm to sound when you enter an area

where a ood warning is in effect.

Flash Flood Warnings—sets an alarm to sound when you enter an

area where a ash ood warning is in effect.

Marine Warnings—sets an alarm to sound when you enter an area
where a marine warning is in effect.

GPSMAP 378/478 Owner’s Manual 77

MAIn Menu > cAlendAr tAb

Sonar Alarms

Shallow Water/Deep Water—sets an alarm to sound when you
enter an area of water that is too shallow or deep. Select On, and

Calendar Tab

Use the Calendar tab to plan trips, view sun and moon, and hunting

and shing information for the day.

then specify a depth. You must be receiving sonar NMEA data for
this function to work.

Highlight an arrow and press ENTER to change the date in the view.

Water Temp—sets an alarm to indicate if the water temperature has

exceeded or dropped below a specic temperature, or fallen outside/
inside a specic temperature range. Select Above or Below and then
enter a specic temperature, or select Inside or Outside and enter a

range of temperatures. You must be receiving sonar NMEA data for
this function to work.

List of points

and routes

added to this

date.

Drift—sets an alarm to sound when you exceed a specied drift
distance. Select On, and then enter a specic distance.

Fish—sets an alarm to sound when sh are detected with sonar.

Calendar Options

The options menu is available in all three calendar views. Press
MENU on any of the calendar views to open the options menu.

To view the Sun & Moon Information tab or Hunt & Fish sub tab,

highlight View Sun and Moon or View Hunt and Fish, and press
ENTER.

Sunrise and
sunset times

for the current

location and

date.

Calendar Tab in Day View

78 GPSMAP 378/478 Owner’s Manual

MAIn Menu > celestIAl tAb

To add a route (or point) to the calendar:

1. Highlight the Calendar tab on the Main Menu. The current
day appears on the Day View sub tab.

2. Press MENU to open the options menu. Highlight Add Route
(or Add Point), and press ENTER.

3. From the pop-up route list (or the Find Menu if Add Point
was selected), select the route you want to add to the
calendar, and press ENTER.

Celestial Tab

The Celestial tab shows tide information, sun and moon information,

and hunting and shing information. You can view data for your

current location, a location from the map, or a waypoint location.
Also, you can select a different date and time, or use the current
data.

Day View Sub Tab

The Day View sub tab shows sunrise and sunset times for your
current date and location. Points and routes for the day appear in a
list.

Week View Sub Tab

The Week View sub tab provides the same elements as Day View,
but the entire week is visible. Days with added points or routes are
shown highlighted in green. Icons for the points and routes assigned
to the date are shown along the bottom of the screen.

To access the Celestial tab:

1. Highlight the Celestial tab on the Main Menu.

2. Use the ROCKER to select the sub tab you want, such as

Month View Sub Tab

The Month View sub tab provides the same elements as Day View,
but the entire month is visible. Days with added points or routes are
shown highlighted in green. Icons for the points and routes assigned
to the date are shown along the bottom of the screen.

Main Menu—Celestial Tab

Sun & Moon.

GPSMAP 378/478 Owner’s Manual 79

MAIn Menu > celestIAl tAb

Tide Sub Tab

The Tide sub tab contains a graphical chart that shows tide station

To view a tide chart for a different tide station:

1. From the Tide sub tab, highlight the At eld, and press

information in a 24-hour span starting at midnight station time. You
can choose from different dates and more than 3,000 tide stations.

Enter the date for which you want to

view the tide information.

Height of tide

Smallest and

largest tides

for the AM

hours

Tide Sub Tab

Select the tide station for which you

want to view the information.

Time

Smallest and

largest tides

for the PM

hours

2. Press MENU, and select Near Current Location, Near

3. Select a tide station from the list, and press ENTER. The

4. Highlight OK, and press ENTER. The Tide tab appears again

To view the tide chart for another date:

1. From the Tide sub tab with a chart open, highlight the On

2. ENTER the date with the ROCKER, and press ENTER. You

The top of the page shows the tide station and date being referenced.
The chart shows a 24-hour block of time, with the time progressing
from left to right. The solid vertical lines represent 4-hour

3. Press ENTER when nished. The unit shows the chart for the

increments; the dotted vertical lines represent 1-hour increments.

The tide curve appears as a shaded area; higher tides are taller and
lower tides are shorter. The bottom of the page indicates the times

To use the current date again, highlight the Date eld. Press MENU,
highlight Use Current Date, and press ENTER.

with the highest and lowest tides.

ENTER. The Find Menu opens showing the tide stations.

Current Route, Near Other (select another location using

the map), or Near Destination. The list is updated with your
search requirements.

Tide Station Information Page appears.

showing the tide chart for the selected tide station.

eld, and press ENTER.

can also use the zoom IN and OUT keys to view information
for another date. Press and hold IN or OUT to scroll quickly
through dates.

date you entered or selected.

80 GPSMAP 378/478 Owner’s Manual

MAIn Menu > celestIAl tAb

To view a chart’s details for another time during the
day (other than current time):

1. From the Tide sub tab with the chart you want to view, press
MENU, and then select Move Cursor.

2. Press the ROCKER right or left to view the chart at another
time.

3. To return to the current time, press MENU, and select Stop

Moving Cursor.

To automatically start Pointer Mode to scroll the chart:

1. Highlight the Date eld. Then press down to start the Pointer
(Pan) Mode.

2. Scroll the chart right to view the next day or left to view the
previous day.

Sun & Moon Sub Tab

The Sun & Moon sub tab provides you with sunrise/sunset and

moon rise/set times. A graphic of the moon phase also appears.

You can view Sun & Moon information for any date or location.

You can also use the play, fast forward, and stop buttons to view an

animation of the Sun & Moon sub tab.

controls for the

To view sun and moon information for a different date:

1. Highlight the Date eld, and press ENTER.

2. Use the ROCKER to change the digits of the date to the date
you want. You can also use the zoom IN and OUT keys to
view information for another date. Press and hold IN or OUT
to scroll quickly through dates.

3. Press ENTER when nished. The unit shows the sun and
moon information for the date you entered or selected.

4. To use the current date again, highlight the Date eld. Press
MENU, highlight Use Current Date, and press ENTER.

Select the

date and

location

Animation

sky view

Sun & Moon Sub Tab

Moon phase

Location of the

sun and moon

in the sky view

GPSMAP 378/478 Owner’s Manual 81

MAIn Menu > celestIAl tAb

To view sun and moon information for a different
location:

1. Highlight the From eld, and press ENTER.

2. Highlight Use Find Menu, and press ENTER. The Find Menu
automatically opens.

3. Select a waypoint or point of interest, and press ENTER.

4. On the Waypoint Information Page, press ENTER. The unit
shows the sun and moon information for the location you
selected.

To use the current location, highlight the From eld. Press ENTER,
highlight Current Location, and press ENTER again.

Hunt & Fish Sub Tab

The Hunt & Fish sub tab provides you with predictions of the best
times to hunt and sh in a selected location on a specic date.

To show the Hunt & Fish information:

1. Highlight the Celestial tab on the Main Menu.

2. Select the Hunt & Fish sub tab.

Hunt & Fish Sub Tab

To view hunt and sh information for a different date:

1. Highlight the Date eld, and press ENTER.

2. Use the ROCKER to change the digits of the date. You can
also use the zoom IN and OUT keys to view information for
another date. Press and hold IN or OUT to scroll quickly
through dates.

3. Press ENTER when nished. The unit shows the information
for the date you entered.

82 GPSMAP 378/478 Owner’s Manual

MAIn Menu > MessAge tAb

To use the current date again, highlight the Date eld. Press MENU,
highlight Use Current Date, and press ENTER.

To view hunt and sh information for a different

location:

1. Highlight the From eld, and press ENTER.

2. Highlight Use Find Menu, and press ENTER. The Find Menu
opens.

3. Select a point, and press ENTER.

4. On the information page, press ENTER. The unit shows Hunt
& Fish information for the selected location.

To use the current location:

1. Highlight the From eld, and press ENTER.

2. Highlight Current Location, and press ENTER.

Message Tab

The Message tab shows a list of messages generated by the
GPSMAP 378/478. Use the ROCKER to scroll through the entire
list of messages on the Log sub tab. Use the Log Filter sub tab to
show only the message types that you want to view.

Main Menu—Message Tab

To view messages:

1. Highlight the Message tab on the Main Menu.

2. Highlight a message.

3. Press ENTER to view detailed information about the
message.

GPSMAP 378/478 Owner’s Manual 83

MAIn Menu > dIsPlAy tAb

To show or hide messages using the log lter:

1. Highlight the Message tab on the Main Menu.

2. Highlight the Log Filter sub tab. All messages appear by
default.

Message Log Filter Tab

3. Highlight the message type you want to hide, and press
ENTER. The message name appears in the Hide window.

4. Highlight the message, and press ENTER to show it again.

Display Tab

Use the Display tab to set display features, such as pages to show in
the main page sequence and how long the backlight stays on.

Main Menu—Display Tab

Main Menu—indicates whether the Main Menu tabs are to contain
text and icons (default), or text tabs only.

Color Mode—sets the display to Day, Night, or Auto Color Mode.
Select Auto to automatically switch from day to night at sunset and
change back at sunrise.

Backlight Timeout—sets the backlight to stay on when it is turned
on, or to time out after a selected period of time has elapsed when
using the battery. The backlight stays on regardless of this setting
when external power is used.

84 GPSMAP 378/478 Owner’s Manual

MAIn Menu > sound tAb

Twilight Adjustment—allows the unit to adjust the backlight for
optimum viewing during twilight times.

Highway Page—indicates whether the Highway Page appears in the

Sound Tab

Use the Sound tab to customize the sounds made by your
GPSMAP 378/478.

main page sequence.

XM Audio Page—indicates whether the XM Audio Page appears in
the main page sequence.

Compass Page—indicates whether the Compass Page appears in the
main page sequence.

Backlight Intensity—turns the backlight up or down. Press right on
the ROCKER to increase the intensity or left to decrease.

Beeper—sets the beeper to chime during keypresses and alarms
(Key and Alarm) or on Alarms Only.

Audio Jack—sets the audio jack output for Headphones or
Line Out.

Attention Tone—turns on and off the attention tone that sounds

before the vocal prompts.

Voice Prompt—sets the vocal prompt to operate for Guidance and
Status, Route Guidance Only, or No Voice Prompts.

Main Menu—Sound Tab

Voice Language—sets the language for vocal prompts.

Speaker Volume—sets the external speaker or headphone volume.

GPSMAP 378/478 Owner’s Manual 85

MAIn Menu > setuP tAb

Setup Tab

To customize how your GPSMAP 378/478 looks, use the System tab
to adjust certain system settings.

System Sub Tab

Use the System sub tab to control settings for System Mode, Speed
Filter, Text Language, WAAS, and External Power.

To access the System sub tab:

1. Highlight the Setup tab on the Main Menu.

2. Select the System sub tab.

Usage Mode—sets the unit to operate in Marine (default) or
Automotive Mode.

Speed Filter—allows the unit to average speed readings. Choose

from Off, Auto (automatically controls ltering), or On (allows you
to enter a value in seconds).

Text Language—sets the unit’s on-screen language.

WAAS—allows you to enable or disable WAAS.

External Power Off—indicates whether the GPSMAP 378/478

remains on (Stay On) or the unit turns off (Turn Off) when external
power is removed from the unit.

External Power On—indicates whether to turn on the
GPSMAP 378/478 (Turn On) or charge the battery
(Charge Battery) when external power is applied to the unit.

Main Menu—System Setup Tab

System Mode—sets the unit to operate in Normal Mode, Battery
Saver Mode, or Simulator Mode (for practice ONLY).

86 GPSMAP 378/478 Owner’s Manual

MAIn Menu > setuP tAb

Road Routing Sub Tab

Use the Road Routing sub tab to select road routing settings.

To access the Road Routing sub tab

1. Highlight the Setup tab on the Main Menu.

2. Select the Road Routing sub tab.

Ask My Preference—determines whether you are asked to select a
Route Preference before route calculations.

Calculation Method—sets how the unit searches for the route.

•

Quickest Calculation—calculates the route the quickest, but
it might not produce the best route.

Quick Calculation—takes a bit more time to calculate but

•
generates a better quality route.

Better Route—generates an even better quality route but uses

•
a longer calculation time.

Best Route—generates the optimal route but takes the longest

•
time to calculate.

Calculate Routes for—sets route calculation for the particular

Road Routing Sub Tab

Route Preference—allows the unit to calculate routes based on:

•

Faster Time—routes calculated are faster to drive but might
be longer in distance.

Shorter Distance—routes calculated are shorter in distance

•

vehicle you are operating to optimize the route for your vehicle type.

Avoid—allows you to avoid certain road types and maneuvers on
your route. The unit uses these road types only if alternative routes
take you too far out of your way or if no other road is available.

Custom Avoids—allows you to enter specic areas and roads that

you would like to avoid in your navigation.

but might take more time to drive.

Off Road—creates a direct line from your current location to

•
your destination. This is useful when traveling outside of the
detailed map coverage area or where no roads exist.

GPSMAP 378/478 Owner’s Manual 87

Custom Road Prefs—allows you to avoid or use Major, Medium,
and Minor roads using a slider scale. This is useful if you want to
avoid major highways, for example. Select Auto Set to use preset
values.

MAIn Menu > setuP tAb

Guidance Sub Tab

Use the Guidance sub tab to set guidance information.

To access the Guidance sub tab

1. Highlight the Setup tab from the Main Menu.

2. Select the Guidance sub tab.

Guidance Sub Tab

Off-Route Recalculation—allows you to set whether the unit
prompts you when it is recalculating your route (Prompted), or
recalculates automatically. Set whether the unit announces the
recalculation (Automatic - Announced) or recalculates silently
(Automatic - Silent). You can turn the off-route recalculation Off.

Next Turn Pop-up—turns the Next Turn pop-up window Off, or
opens the window when you press NAV (Held NAV Key Only),
opens automatically (Automatically Only), or Both.

Timers Sub Tab

Use the Timers sub tab to set timers and view information about how
long the unit has been on.

To access the Timers sub tab

1. Highlight the Setup tab from the Main Menu.

2. Select the Timers sub tab.

Timers Sub Tab

User—allows you to set the timer to Count Up or Count Down.
You can also Reset the timer and turn it Off. Enter a time to use
when counting up or down.

Marine—appears on the Compass Page in Marine Mode.

Since Midnight—shows the time the unit was turned on since
midnight. To reset, select All Unit Defaults on the System sub tab.

88 GPSMAP 378/478 Owner’s Manual

MAIn Menu > setuP tAb

Time Sub Tab

Use the Time sub tab to set the time format and zone, and set the
unit to conform to Daylight Saving Time. The current time and date

appear in the Current Time and Date eld.

To access the Time sub tab

1. Highlight the Setup tab on the Main Menu.

2. Select the Time sub tab.

Units Sub Tab

Use the Units sub tab to customize measurement units.

To access the Units sub tab

1. Highlight the Setup tab on the Main Menu.

2. Select the Units sub tab.

Distance and Speed—selects the unit of measure to show your
speed and distance traveled.

Time Sub Tab

Direction Display—selects the unit of measure to show your

Time Zone—choose the time zone for your city so the

GPSMAP 378/478 will show the correct local time. Select Other to
enter a UTC Offset.

If the wrong date appears, press MENU, highlight Set Date, and

direction. Mils is a unit of angle measurement used in military
settings, in which 17.78 mils equal one degree.

Temperature—selects the unit of measure to show the temperature.

Elevation—selects the unit of measure to show your altitude.

press ENTER. You are prompted to enter the current year. The
GPSMAP 378/478 uses this information when gathering satellite
data to show the correct date.

Depth—selects the unit of measure to show the depth.

Vertical Speed—selects the unit of measure to show the vertical

speed.

GPSMAP 378/478 Owner’s Manual 89

MAIn Menu > setuP tAb

Location Sub Tab

Use the Location sub tab to change location setting information.

The default setting is WGS 84. The unit automatically selects the
best datum depending on your chosen location format.

To access the Location sub tab:

1. Highlight the Setup tab on the Main Menu.

2. Select the Location sub tab.

See the “Appendix” for more information about location formats
and map datums. Also visit the National Imagery and Mapping
Agency at www.nima.mil for more information on grids and datums.

Selecting a Different Heading Reference

You can select from Auto Mag Var, True, Grid, and User Mag Var.
Auto Mag Var provides magnetic north heading references that are
automatically determined from your current location. True provides

Changing the Location Format

When you change the Location Format, you change the coordinate
system in which a given location reading appears. The default
format is latitude and longitude in degrees, minutes, and thousandths
of a minute (hddd°mm.mmm). Only change the location format if

you are using a map or chart that species a different location format

or want to use a format you are familiar with.

headings based on a true north reference. Grid provides headings
based on a grid north reference (and is used in conjunction with
the grid position formats). User Mag Var allows you to specify the
magnetic variation at your current location and provides magnetic
north heading references based on the variation you enter. Enter
the magnetic variation of your current location in the Magnetic
Variation eld if you selected User Mag Var for the heading.

Selecting a Different Map Datum

Datums are used to describe geographic positions for surveying,
mapping, and navigation and are not actual maps built in the unit.

Only change the datum if you are using a map or chart that species

a different datum.

WARNING: Selecting the wrong map datum can result in

substantial position errors. When in doubt, use the default
WGS 84 datum for best overall performance.

WARNING: If User Mag Var is selected, the unit does not

automatically calculate and update the magnetic variation at
your present location. You must update the magnetic variation as
your location changes. Failure to update this setting can result in
substantial differences between the information shown on your
unit and external references, such as a magnetic compass.

90 GPSMAP 378/478 Owner’s Manual

MAIn Menu > setuP tAb

Welcome Sub Tab

3. To show the welcome message when you turn on your

Use the Welcome sub tab to enter information, such as your name
and address, or a welcome message that appears when you turn on
your GPSMAP 378/478.

To access the Welcome sub tab:

1. Highlight the Setup tab on the Main Menu.

2. Select the Welcome sub tab.

Interface Sub Tab

Use the Interface sub tab to change the data format and control the
input/output format used when connecting your unit to external
devices.

To access the Interface sub tab:

1. Select the Setup tab on the Main Menu.

2. Select the Interface sub tab.

Welcome Sub Tab

To add a welcome message:

1. Highlight one of the Welcome Message elds, and press

ENTER.

2. Use the ROCKER to enter information in the elds. You do

not need to enter information in every eld. When nished,

press ENTER again.

GPSMAP 378/478, highlight the
box, and press ENTER to select it. To hide the welcome
information at start-up, clear the check mark.

Interface Sub Tab

Show at Power-up check

GPSMAP 378/478 Owner’s Manual 91

MAIn Menu > setuP tAb

Serial Data Format—sets the data format to one of the following:

•

Garmin Data Transfer—provides the proprietary format
used to exchange data with a computer or another Garmin
GPSMAP 378/478. Garmin Data Transfer is disabled when
the USB is connected, and the unit automatically switches to
USB format. When the USB is disconnected, the USB eld
changes to Transfer Mode.

GARMIN DGPS—connects the GPSMAP 378/478 with a

•
Garmin DGPS beacon receiver.

Garmin Remote Sonar—connects the GPSMAP 378/478

•
with a GSD 21 or GSD 20 Sounder Module and transducer.

NMEA In/NMEA Out—supports the input/output of

•
standard NMEA 0183 version 3.01 data and sonar NMEA
input support for the DBT, DSE, DPT, MTW, and VHW
sentences.

RTCM In—allows DGPS input using a standard RTCM

•
format.

RTCM In/NMEA Out—allows DGPS input using a standard

•

•

Text Out—allows the unit to output simple text data that
includes data, time, location, and velocity. The Baud can be
set to 1200, 2400, 4800, or 9600.

None—provides no interfacing capabilities.

•

If you select GARMIN DGPS or RTCM In/NMEA Out format,
you can control a differential beacon receiver directly from your
GPSMAP 378/478 using the Interface sub tab. You can 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 will
be used to tune the beacon receiver. If you use a DGPS receiver,
WAAS capability is automatically turned off.

To have the unit automatically scan for a frequency:

1. Set the unit to GARMIN DGPS or RTCM In/NMEA Out.

2. Highlight the Beacon eld, and press ENTER.

3. Highlight Scan, and press ENTER. The numbers in the

Frequency eld change as the unit scans from 284 kHz to

325 kHz, 200 bit rate, then 100, at 6-second intervals.

RTCM format and also provides NMEA 0183 version 3.01
output.

RTCM In/Text Out—allows Differential GPS (DGPS) input

•
using a standard RTCM format and also outputs simple text
data that includes data, time, location, and velocity.

92 GPSMAP 378/478 Owner’s Manual