AIS

Data transmitted by AIS falls in four category:- 

(a) Static data 

1. IMO number
2. Name & call sign
3. Length & beam
4. Type of ship
5. Location of position fixing antenna 

It is programmed when installing the equipment. This data is sent every 6 minutes or on request.

(b) Dynamic data

1. Ship’s particular
2. UTC time
3. COG & SOG
4. Heading
5. Navigational status (manually selected)
6. ROT (if available)

This data is sent as per ship’s navigational status or speed.

1. At anchor – every 3 minutes
2. Speed 0 to 14 knots – every 12 seconds 
3. Speed 14 to 23 knots – every 6 seconds or every 2 seconds if changing course
4. Speed over 23 knots – every 2 seconds.

(c) Voyage related data 

1. Ship’s draft
2. Destination & ETA
3. Type of cargo
4. No of crew member 

This has to be entered manually. This data is sent every 6 minutes or on request.

(d) Safety related message

These are normally sent in text format and may be directed to a specific stations or all stations and sent only when required. It should be used only for safety related communication and should not be used for commercial or personal communication.