The AISentinel is a device that will monitor the output of your AIS receiver for messages from an activated AIS SART beacon. When an AIS SART message is seen, an alarm is given in the form of a 90 dB two tone signal and the possibility of activating an external horn device via a relay.

The intended usage scenario is to alert the crew below decks if the watch at the helm falls overboard and activates their AIS Sart. If no alarm is fitted, the vessel may continue for hours on the autopilot without anybody noticing ...

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For the technically inclined, here is the source repository