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Sonar Tab
Use the Sonar tab to set up and congure sonar. See the “Setting
Up and Using Sonar” section beginning on page 90 for more
information about Sonar setup options.
NOTE: You must have a GSD 20 or 21 sounder module
connected to your GPSMAP 278 to use sonar.
Main Menu—Sonar Tab
Alarms Tab
Use the Alarms tab to dene alarm settings. When an alarm goes off,
the alarm message appears on the GPSMAP 278 and the unit emits
ve (5) beeps.
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 a persistent alarm, the alarm message appears on
the screen and the GPSMAP 278 beeps until you press ENTER to
acknowledge the alarm.
GPSMAP 278 Owner’s Manual 71
MAIn Menu > sonAr tAb And AlArMs tAb
79


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