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The automatic identification system (AIS) is an automatic tracking system that uses transponders on ships to track them and provide information about them.
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AIS (Automatic Identification System) or The Long-Range Identification and Tracking (LRIT)
http://catalog.data.gov/dataset/commercial-vessel-density-october-2009-2010-ais-national
might be what I want but when I follow the hyperlink to
ftp://ftp.csc.noaa.gov/pub/MSP/AIS/CommercialVesselDensityOctober2009 …