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AIS Carriage Requirements - USCG


AIS is a system that consits of a VHF transmitter, VHF TDMA receivers and VHF DSC receiver and a standard marine electronic communication link  to shipboard display and sensor systems. It provides position and timing information which is usually derived from either and integrated or external GPS (Global Positioning System) receiver. This includes GNSS receiver which provides precise positions in coastal and inland waterways. Additional broadcast information that can be provided includes course and speed over ground, identification, heading information, rate of turn, angle of heel, pitch and roll and destination and ETA can be incorporate as well.

The system indicates every significant ship within radio range and provides information as required such as velocity vector (speed and heading) With each ship "mark" can provide actual size of the ship, position to GPS or differential GPS accuracy along with ships name, course, speed, classification, call sign, registration number, MMSI and other additional information as provided. This provides maneuvering information, closest point of approach (CPA), time to closest point of approach (TCPA) and other information then is readily available from other navigation aids. AIS system acts similary to a transpoder,which operates on VHF marine band radio frequencies handling over 4500 reports per minutes and updates at a rate of up to two seconds.

Contact For more information on AIS products and installation.

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Last modified: May 15, 2006