Depth Alarm; Fish Id Alarm; Low Battery Alarm - Humminbird 500 Series Operation Manual

Depth Alarm sounds when the depth becomes equal to or less than the menu
setting.
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. 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.
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 example, 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.

Depth Alarm

Settings: OFF, 1 to 100 feet, or 0.5 to 30 meters
[International Models only]; Default = OFF

Fish ID Alarm

Settings: Off, All, Large/Medium, Large; Default = Off
Off
All
Large/Medium
Large

Low Battery Alarm

Settings: Off, 8.5V - 13.5V; Default = Off
59 Alarms Menu Tab