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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)

Some time ago I was searching for shipping graphs to try playing with routing, but I found a little. Here's some links: - http://geocommons.com/maps/109850 (contains a density on the arc) http://gizm …
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