Garmin Marine GPS System GPSMAP User Manual

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SettInG uP and uSInG Sonar
This section covers the additional sonar options for the
GPSMAP 378/478 when used in conjunction with a GSD 21
Sounder Module. Read the GSD 21 Sounder Module Installation
Instructions to properly install the sounder module. When you turn
on your GPSMAP 378/478, the sounder module automatically turns
on.
NOTE: You MUST have a GSD 21 installed and connected to
your GPSMAP 378/478 to use the sonar features.
The Sonar Page is added to the end of the page sequence when you
are in Marine Mode. To view the Sonar Page, press PAGE or QUIT
repeatedly until it appears.
Showing Sonar on the Map Page
You can change the layout of the Map Page to view a split screen to
show the sonar on the Map Page. You must be in Marine Mode to
use sonar.
To show the Sonar Page on the Map Page:
1. Press and hold PAGE/MODE.
2. Highlight Marine, and press ENTER.
3. Press PAGE or QUIT to open the Map Page.
4. Press MENU. Highlight
Set Up Page Layout, and press
ENTER.
5. Highlight Map with Sonar, and press ENTER.
Map Page with Split Screen
To resize the Map Page sonar split screen:
1. After showing the Sonar and Map Pages together in the split
screen as described in the previous steps, press MENU.
2. Highlight Size Split, and press ENTER.
3. Use the ROCKER to move the vertical double-arrow right or
left.
4. Press ENTER.
5. To stop resizing the screen, press QUIT. You can also press
MENU, highlight Stop Resizing, and press ENTER to stop
resizing the screen and retain the previous split setting.
GPSMAP 378/478 Owner’s Manual 103
settIng uP And usIng sonAr > shoWIng sonAr on the MAP PAge

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