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===Marine=== The [[International Maritime Organization]]'s [[International Convention for the Safety of Life at Sea]] (SOLAS) requires the [[Automatic Identification System]] (AIS) to be fitted aboard international voyaging ships with {{GT|300 or more|disp=long}}, and all passenger ships regardless of size.<ref>{{cite web |work = [[International Convention for the Safety of Life at Sea|SOLAS]]'1974 |url = http://www.imo.org/KnowledgeCentre/ReferencesAndArchives/HistoryofSOLAS/Documents/SOLAS%201974%20-%20Brief%20History%20-%20List%20of%20amendments%20to%20date%20and%20how%20to%20find%20them.html#43 |title = December 2000 amendments |author = International Maritime Organization |url-status = dead |archive-url = http://arquivo.pt/wayback/20140725015425/http://www.imo.org/KnowledgeCentre/ReferencesAndArchives/HistoryofSOLAS/Documents/SOLAS%201974%20-%20Brief%20History%20-%20List%20of%20amendments%20to%20date%20and%20how%20to%20find%20them.html#43 |archive-date = 2014-07-25 }}</ref> AIS transmitters/receivers are generally called ''transponders'', but they generally transmit autonomously, although [[Coast radio station|coast stations]] can interrogate [[Automatic identification system#Detailed description: Class B units|class B transponders]] on smaller vessels for additional information.{{cn|date=May 2024}} In addition, [[navigational aid]]s often have transponders called [[Racon|RACON]] (radar beacons) designed to make them stand out on a ship's radar screen.{{cn|date=May 2024}} [[Sonar]] transponders operate under water and are used to measure distance and form the basis of underwater location marking, position tracking and [[navigation]].
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