Check out this ship tracking site! Free registration and it seems to be live. Go to the Google maps feature and search for ship name, or you can browse by region. One thing I noticed is that the region browsing seems to only show green icons, which are ships that are moving. If you do a name search, I think it'll show yellow and red icons, which are the ones that are slowed and stopped.
http://www.shinemicro.com/Live.asp