Humminbird 778C - Manual (Page 67)

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Depth Alarm
Settings: Off, 1 to 100 ft, or 0.5 to 30 m (International
Models only); Default = Off
Depth Alarm sounds when the depth becomes equal to or less than the menu
setting.
Fish ID Alarm
Settings: Off, All, Large/Medium, Large; Default = Off
Fish ID Alarm sounds when the Fishfinder detects fish that correspond to the
alarm setting. Fish ID Alarm will only sound if Fish ID+™ is on.
Low Battery Alarm
Settings: Off, 8.5V to 13.5V; Default = Off
Low Battery Alarm sounds when the input battery voltage is equal to or less
than the menu setting. The battery alarm will only sound for the battery that is
connected to the Fishfinder. The Low Battery Alarm should be set to warn you
when the battery voltage drops below the safety margin that you have
determined.
For instance, if you are running a trolling motor (battery operated), you would
want to set the Low Battery Alarm to sound before the battery voltage drops
too low for it to be used to start your main, gasoline-powered engine.
Large
Large/Medium
All
Off
For example, if you've set the Fish ID Alarm to sound for Large fish only, the
Fish ID alarm will sound when a large-sized fish is detected.
Alarms Menu Tab