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AIS transceivers automatically broadcast information, such as their position, speed, and navigational status, at regular intervals via a VHF transmitter built into the transceiver. The information originates from the ship's navigational sensors, typically its global navigation satellite system (GNSS) receiver and gyrocompass. Other information ...
This contrasts to the Automatic identification system (AIS) used globally on ships that transmit continuously. A short post-transmission message is sent by the radio with the vessel identity and is in the form of an encoded call sign or Maritime Mobile Service Identity , starting with number "9" and the three country-specific maritime ...
These transceivers transmit data to monitoring systems generally using a variety of communication technologies including terrestrial and satellite AIS and conventional satellite systems from Inmarsat, Iridium, Argos, Orbcomm or Qualcomm. Increasingly nations are implementing a mixture of technologies with the largest vessels over 60 tons being ...
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More advanced transceiver units support AIS. This relies on a GPS receiver built into the VHF equipment or an externally connected one by which the transceiver obtains its position and transmits this information along with some other details about the ship (MMSI, cargo, draught, destination and some others) to nearby ships.
8 Handheld VHF transceiver with DSC and GNSS [3] 9 Devices using a free-form number identity: [2] Search and Rescue Transponders (970yyzzzz) [note 2] [4] [note 3] [5] Man overboard DSC and/or AIS devices (972yyzzzz) [note 2] 406 MHz EPIRBs fitted with an AIS transmitter (974yyzzzz) [note 2] craft associated with a parent ship (98MIDxxxx) [note 4]
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