Automatic Identification System
automatic tracking system that uses transceivers on ships and is used by vessel traffic services
Automatic Identification System (AIS) is a way for a ship to send data by radio to tell other ships its position. AIS was made to avoid ships colliding and make it safer to travel by sea. AIS sends messages every few seconds, and these are received other boats and by stations on land and on some satellites. A ship knows its position by using Global Positioning System (GPS). Since 2004, all ships above 300 tons and all passenger ships have to use AIS.[1] It is now also used by many yachts and other leisure boats.
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A ship can see where other ships are (this is the English Channel) -
A person on land can tell ships where to go
References
change- ↑ Regulations for carriage of AIS Archived 2020-05-28 at the Wayback Machine from International Maritime Organization