![]() If a suitable chartplotter is not available, local area AIS transceiver signals may be viewed via a computer using one of several computer applications such as ShipPlotter, GNU AIS or OpenCPN. All AIS transceivers equipped traffic can be viewed this way very reliably but is limited to the VHF range, about 10–20 nautical miles. Port authorities or other shore-based facilities may be equipped with receivers only, so that they can view the local traffic without the need to transmit their own location. This requires a dedicated VHF AIS transceiver that allows local traffic to be viewed on an AIS enabled chartplotter or computer monitor while transmitting information about the ship itself to other AIS receivers. Viewing and using AIS data ĪIS is intended, primarily, to allow ships to view marine traffic in their area and to be seen by that traffic. For a variety of reasons, ships can turn off their AIS transceivers. The International Maritime Organization's International Convention for the Safety of Life at Sea requires AIS to be fitted aboard international voyaging ships with 300 or more gross tonnage (GT), and all passenger ships regardless of size. Vessels fitted with AIS transceivers can be tracked by AIS base stations located along coastlines or, when out of range of terrestrial networks, through a growing number of satellites that are fitted with special AIS receivers which are capable of deconflicting a large number of signatures. ![]() AIS integrates a standardized VHF transceiver with a positioning system such as a Global Positioning System receiver, with other electronic navigation sensors, such as a gyrocompass or rate of turn indicator. AIS is intended to assist a vessel's watchstanding officers and allow maritime authorities to track and monitor vessel movements. Information provided by AIS equipment, such as unique identification, position, course, and speed, can be displayed on a screen or an electronic chart display and information system (ECDIS). Although technically and operationally distinct, the ADS-B system is analogous to AIS and performs a similar function for aircraft. AIS information supplements marine radar, which continues to be the primary method of collision avoidance for water transport. When satellites are used to receive AIS signatures, the term Satellite-AIS (S-AIS) is used. The automatic identification system ( AIS) is an automatic tracking system that uses transceivers on ships and is used by vessel traffic services (VTS). ![]() A graphical display of AIS data on board a ship. An AIS-equipped system on board a ship presents the bearing and distance of nearby vessels in a radar-like display format. Coast Guard Operations Specialist using AIS and radar to manage vessel traffic. For inland waterways transmission identification, see Automatic Transmitter Identification System (marine). ![]()
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