Digitraffic
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AIS messages

Message filtering and modification

The automatic identification system (AIS) is an automatic tracking system on ships and vessels. It provides information such as unique identification, position, course, and speed. AIS is intended to allow ships to view marine traffic in their area and to be seen by that traffic.

Digitraffic service provides A class position and metadata messages. Some AIS-messages are filtered or modified.

Fishing vessels

All fishing vessels (vessel type 30) are filtered out from the AIS-messages.

Vessel type

Vessel types and cargo descriptions are modified with following rules.

Original valueModified valueVessel type
00Default value or type not in use
1 - 19keep original valueReserved for future use
20 - 2920Wing in ground (WIG)
30 - 39keep original value31 - 32 Tug (towing)
33 Dredging, underwater operations
34 diving operations
35 Military
36 Sailing
37 Pleasure craft
40 - 4940High speed craft (HSC)
50 - 59keep original value50 Pilot
51 Search and rescue
52 Tug
53 Port tender
54 Anti pollution
55 Law enforcement
56 - 59 Other
60 - 6960Passenger
70 - 7970Cargo
80 - 8980Tanker
90 - 9990Other
> 99keep original valueReserved for future use
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