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Man_instr_ai71_ai70_r1
Coverage
The system radio coverage range is similar to other VHF
applications and is dependent on the height of the antenna. The
propagation differs from that of a radar, due to the longer
wavelength, so it is possible to "see" around bends and behind
islands if the landmasses are not too high. A typical value to be
expected at sea is 20 nautical miles.
AIS Information Content
AIS type of information is exchanged automatically between
vessels, vessels and shore based stations and vessel and Aids to
Navigation like buoys and lighthouses. The information
transmitted by a vessel's AIS system is grouped in four
categories:
Static Data
− MMSI (Maritime Mobile Service Identity) number
− Call sign and name
− IMO number
− Length and beam
− Type of ship
− Location of position fixing antennas on the ship
Voyage Related Data
− Ship's draught
− Hazardous cargo type
− Destination and ETA (at Master's discretion)
Dynamic Data
− Position with accuracy indication and integrity status
− Time in UTC
− COG (Course over ground)
− SOG (Speed over ground)
− Heading
− Navigational status
− Rate of turn
Safety-Related Messages
− Reading and writing short safety related messages
SYSTEM OVERVIEW
3
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