Vessel Watch for Desktop
Have you tried WSF’s Vessel Watch? It’s a great way to see, in real time, where the ferries are. The web page gives information about the vessel, route, schedules, departure and arrival times, and information about delayed sailings. Also included are links the terminal webcams. You can set the automatic update interval from 15 seconds to 10 minutes.
Here’s a screenshot from the website (click for a larger view):
Vessel Watch is a great way to keep track of the ferry, especially during the busy summer season. If you’re expecting guests, you can check to see if their ferry is on time. If you’re meeting someone coming off the interisland boat, you can see precisely when their ferry docks.