MarineTraffic: Global Ship Tracking Intelligence
www.marinetraffic.com/en/ais/home/centerx:21.4/centery:36.0/zoom:2
What Jamie wrote
Near real-time map of marine vessels around the world. I've seen this for flights before but this marine version is fun. Filter the vessel type to "Pleasure Craft" and you can see many of the ships have pictures associated with them.