AIS receivers and transponders report received messages over the NMEA protocol in AIVDM sentences. They look something like this:
!AIVDM,1,1,,A,13u?etPv2;0n:dDPwUM1U1Cb069D,0*24
AIVDM messages are AIS reports from other vessels, and AIVDO messages carry your own ship’s data.Below is a very simple decoder for NMEA AIVDM sentences. Currently it only decodes message types 1, 2, 3, 4 and 24 – i.e. position reports for class A shipborne equipment, base station reports and static data reports.
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