cowal weather

AIS - Automatic Identification System

As part of the global maritime safety system, ships over 300 tons are now required to broadcast their positions using AIS.

A ship transmits "dynamic" information at intervals of between 2 and 12 seconds depending on the vessel's speed or 3 minutes if at anchor.

• MMSI number
• Navigation status, e.g. 'at anchor' or 'underway'
• Ground speed, from 0 to 102 knots in steps of 0.1 knots
• Rate of turn, 0 to 720 degrees per minute
• Position (GPS latitude and longitude)
• Heading and Course over Ground
• Time stamp

Then every six minutes "static" information is transmitted:

• MMSI number
• Callsign
• Ship's name
• Type of ship
• Width, length and draught
• Antenna Location
• Destination
• Estimated time of arrival (ETA)

Voyage related information such as draught, cargo, destination, ETA and route plan is generally manually entered and updated by the bridge team

For a map of the Clyde click here.

For more information on AIS go to: http://www.aisliverpool.co.uk

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