AIS Collision Alarm: CPA/TCPA Alert Data Output

[GSAtlantic]

are you sure you want this as part of OP ? In OpenCPN you already have the various AIS alarm settings - but "just" audio and not your requested blinking LED.
Maybe a feature request to the opencpn team to get a some addl NMEA message and then use OP to action on these messages.

just my 2c - maybe others have better ideas ?

Skipper,

My goal is to run headless to save power, but still know when, and from where, an AIS target is approaching.  I think I could currently output the AIS NMEA messages.  Calculating bearing, distance, and CPA is the harder part which OpenCPN already does.

Perhaps I just need a louder speaker for the alarm.

Thanks,

G