I should probably add that the AIS display I was looking at was over on Walker's BVI Pirate Site.
It's a cool little tool, and free of course.

http://forums.bvipirate.com/ais.php

Just took a look at it and I see that Blue Moon (a TTOL Site Sponsor) was transiting the south side of St. Thomas 3 hours ago, perhaps headed to Charlotte Amalie.