So you would like to decode NMEA AIS sentences of the type !AVDM and !AVDO
The best thing is to use one of the free available programs to decode AIS messages we listed here.
But if you want to do this on-line, you have some on-line tools where you can paste the messages that you would like to decode. These are NMEA 0183 messages:
- AIVDM & AIVDO NMEA sentence decoder: http://rl.se/aivdm
- MARITEC – AUTOMATIC IDENTIFICATION SYSTEM (AIS): http://www.maritec.co.za/aisvdmvdodecoding.php
And if you would like to dig in further and build your own decoder, there is available information here: