Garmin Marine GPS System GPSMAP User Manual

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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
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.
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
press down to decrease. Press right to raise the volume or
left to lower.
3. Press ENTER or QUIT to close the Backlight/Volume
adjustment window.
Backlight
adjustment slider
Volume
adjustment slider
Battery time remaining and power source indicator
GPSMAP 378/478 Owner’s Manual 3
gettIng stArted > turnIng on the gPsMAP 378/478

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