Automatic Identification System (AIS) is an automated tracking system that displays other vessels in the vicinity. It is a broadcast transponder system which operates in the VHF mobile maritime band. 



It is fitted on ships for identification of ships and navigational marks. However, it is only an aid to navigation and should not be used for collision avoidance. 


AIS operates principally on two dedicated frequencies or VHF channels:

AIS 1: Works on 161.975 MHz- Channel 87B (Simplex, for ship to ship)

AIS 2: 162.025 MHz- Channel 88B (Duplex for ship to shore)

1. Static Information (Every 6 minutes and on request):

MMSI number

IMO number

Name and Call Sign

Length and Beam

Type of ship

Location of position fixing antenna

2. Dynamic Information (Depends on speed and course alteration)

Ship’s position with accuracy indication

Position time stamp (in UTC)

Course Over Ground (COG)

3. Voyage Related Information (Every 6 minutes, when data is amended, or on request)

Ship’s draught

Type of cargo

Destination and ETA

Route plan (Waypoints)

4. Short safety related messages

Free format text message addressed to one or many destinations or to all stations in the area. This content could be such as buoy missing, ice berg sighting etc

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