Airship Ventures provide Zeppelin tours of the San Francisco Bay, Los Angeles and the Monterey Coast. They also provide a live tracking Google Map that shows the current position of the airship.
When the airship is in flight its position and speed is updated every 30 minutes. The most recent flight is currently displayed on the map, with the ship located at the red map marker. Each of the red dots represent one of the half hourly updates. Hovering over a dot will reveal the flight data reported at that update.
You can also click anywhere on the map to see how far that point is from the airship's current location.