AIS Classification: There are 2 types of AIS classes used by ships, Class-A and Class-B.


Class-A: This class is used by commercial ships and they operate on 12 watts while transmitting their information typically every 2 to 12 seconds (depending on speed or if at anchor) with a range of 20 miles or more if the right antenna is fitted high enough. *


Class-B: This class is used mainly by leisure boaters and operates at a lower 2 watts, broadcasting less frequently (roughly 30 seconds) and has a range of 5 to 6 miles. *


*Transmit range only. Receiving range will vary.


Type of information transmitted: AIS transponders typically transmit the following information • Vessel name, MMSI number and call sign


• Type of vessel (such as passenger, cargo, fishing)


• Vessel’s position (current latitude and longitude)


• Course over ground (COG) • Speed over ground (SOG) • Heading from your vessel • Closest point of approach (CPA) (distance)


• Time to closest point of approach (TCPA)


• Vessels’ dimensions (length, beam and draught)


Please note, type of information transmitted may differ from Class-A and Class-B transponders.


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AIS works by taking your position and movements via the vessel’s GPS system or an internal sensor built into an AIS unit.


” Images on this page reproduced by kind permission of ICOM - www.icom.co.uk 84 | The Report • December 2020 • Issue 94


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