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"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 300 or more gross tonnage (GT), and all passenger ships regardless of size.[1] AIS transmitters/receivers are generally called transponders, but they generally transmit autonomously, although coast stations can interrogate class B transponders on smaller vessels for additional information.[citation needed] In addition, navigational aids often have transponders called RACON (radar beacons) designed to make them stand out on a ship's radar screen.[citation needed]
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