Ever wanted to see where passenger vessels, tankers, cargo vessels, yachts, and tug boats are in real time all over the world? If so, you can see where they are, where they are headed, their name, speed, draft, flag, and even more at www.marinetraffic.com/ais.
The tracking of the boats is done via AIS, or Automatic Identification System. AIS is an electronic transponder that transmits boat information via VHF. This digital information is freely available to anyone with the correct receiver/decoder. You can also transmit AIS information from your boat and join the network.
The photo is a screen shot of zooming into Cape Canaveral on the east coast of Florida. I clicked on a random tug boat which happened to be moored at the moment.
It is fun to zoom in on points all around the world, such as Dubai, Australia, and China.