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Marine Traffic dot com allows you to search for ship name, get details about ship and click on "map" to see where it is.
In this case the dive liveaboard M/V Spree
http://www.marinetraffic.com/ais/shipdetails.asp-+++-x?mmsi=366843270
Now only if the old treasure ships had been equiped with transmitters :)
From Greg: That is a really cool site! Neat information....