The Situation Report Message is used to send the equivalent information to AIS Message 1 but removes less essential data to compress message size.
Note: Only aircraft engaged in SAR (using SAR transponder) may transmit AIS.
This is an RTCM compliant update of the FID 0 Message 25 listed in the Oct 2014 EAIS IDD. It also replaces the DAC 366, FI 56 Position Report from the same document.