Sounds when the battery reaches a specified low or high voltage. Check the battery wiring.

Sounds when you set a weather alarm and the radio detects an incoming weather alert (NOAA Weather Broadcasts and Alerts). The radio tunes automatically to the weather channel that is broadcasting the alert.

Sounds first when GPS data from a NMEA^® network or position data entered manually is more than four hours old. Sounds again when GPS data from a NMEA network or position data entered manually is more than 23.5 hours old (Manual Position Information).

Appears after five consecutive failed attempts to request position information from a vessel (Position Tracking).