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AIS Decoder

Python script for decoding AIS (Automatic Identification System) sentences. AIS sees regular use in maritime applications, where modules installed on vessels will emit signals in NMEA 0813 format providing information such as position, heading, speed, etc.

Example Sentence

An example sentence looks like this:

!AIVDM,1,1,,A,13HOI:0P0000VOHLCnHQKwvL05Ip,0*23

Current Capabilities

The script is currently able to extract the following information from the sentence:

  • Raw Message: !AIVDM,1,1,,A,13HOI:0P0000VOHLCnHQKwvL05Ip,0*23
  • Fragment Count: 1
  • Current Fragment: 1
  • Sequence ID: None
  • Channel: A
  • Encoded Message: 13HOI:0P0000VOHLCnHQKwvL05Ip
  • Fill Bits: 0
  • Checksum: 23
  • Message Type: Position Report Class A (1)

Payload Information

{
    'MMSI': '227006760',
    'Navigation Status': 'Under way (Power)',
    'Rate of Turn': 'Turning information not available',
    'SOG': '0.0 knots',
    'Position Accuracy': 'Low',
    'Longitude': '0.13138',
    'Latitude': '49.47557666666667',
    'COG': '36.7'
}

Reference

This script is based on the information provided here: AIVDM/AIVDO protocol decoding