Garmin GPSMAP 3005C Installation Instructions Manual page 11

Optional Alarm Wiring
The GPSMAP 3005C has an alarm circuit that can be used with a lamp, a horn, or both to alert you when the unit displays a message. The alarm
circuit pulls low when the alarm sounds. The alarm does not have to be wired for the unit to function. The maximum current is 100 milliamps. A
switch or relay can be used to select between visual and audible alerts.
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