Tracking ships at Sea

Although I live in a very landlocked area of the U.S. I am fascinated by the ocean and sailing upon it. Now my fascination has a new place to manifest itself in the form of Sailwf.info. This site provides a live tracking map of ships locations around the world, powered by the World Meterological Organization's Voluntary Observing Ship service. The site allows users to select different areas of the world as well as different classes of ships (Tall Ships, Cruise Ships, Research Vessels, etc ..) for viewing. In addition, users can query for specific ships as well and chart travels across a date range. Overall it is a pretty cool site offering some fairly impressive map quality in addition to being able to stalk those on a cruise.