Posted by Keir Clarke. Google Maps Mania, Tuesday, March 16, 2010. "The International Maritime Organization (IMO) requires all vessels over 299GT to carry an AIS transponder on board. The transponder transmits data on position, speed and course, among some other static information, such as the vessel's name, dimensions and voyage details. Thanks to this AIS data there are now a lot of Google Maps mashups showing the real-time positions of ships around the world..."
Further information on Real-Time Ship Tracking on Google Maps
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