A Python library for decoding and encoding:

• AIS type 1 messages
• AIS type 5 messages
• AIS type 24 part A and Part B messages (main craft case )

As there exist reliable and comprehensive python decoders, the emphasis is on encoding.

It is easy but boring to add further messages types, I will do it only if the need arises. To do it you need to read carefully the documentation, the best source I have found is http://catb.org/gpsd/AIVDM.html

The bitstring Python library is a required dependency. You can get it here: https://pypi.python.org/pypi/bitstring

• Still need to implement the communication state bits. These bits are divided into three sections:
  • bits 1-2 is the "sync state"
  • bits 3-5 is the "slot time-out"
  • bits 6-19 is the "sub message"