"Marine Vessel Tracker
" is powered by MarineTraffic.com. MarineTraffic doesn't use a satellite data source. Mostly from land based receivers & some from ships uploading to marinetraffic.com.
From the main story about Google. They will provide satellite received AIS data onto Google Earth & Map. Mostly from area that isn't covered on MarineTraffic.com plus the coastal area like you see on MarineTraffic. It will help AIS coverage like in Alaska area or some of those 3rd countries with lack of AIS coverage. It also could be Realtime
by few hours. Possibly FREE to Google users
It should mostly be the same type of display like on Vesseltrack.com
Satellite AIS (they charge $ 3300 per year!).
you can also watch the demo video about satellite AIS on exactearth.com
Sounds like Google will make big changes in the AIS area