Garmin 278 Manual De Propietario

This section covers the additional sonar options for the 

GPSMAP 278 when used in conjunction with a GSD 21 or  

GSD 20 Sounder Module. Read the GSD 21 or GSD 20 Sounder 

Module Installation Instructions to properly install the sounder 

module. When you turn on your GPSMAP 278, the Sounder Module 

automatically turns on. 

  NOTE: You MUST have a GSD 21 or GSD 20 installed and 

connected to your GPSMAP 278 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. 

You can change the layout of the Map Page to show a split screen 

to show the sonar on the Map Page. You must be in Marine Mode to 

use sonar.

1.  On the Map Page, press 

MENU. 

2.  Highlight 

Set Up Page Layout, and press ENTER. 

3.  Highlight 

Map with Sonar, and press ENTER. 

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.

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