Yeah I just noticed. When I wrote this I lived a substantial distance from the ocean, however now running it against my current address (which is across the road from a marina) it advises I ought to take a ferry sometimes.
Not sure what I can do about this. I have a vague idea you might be able to flag the Google Maps API to avoid ferries.
But this walk from downtown Seattle is priceless :-) https://www.dropbox.com/s/a7z4aybpv6kjldx/Screen%20Shot%2020...
Walk to the ferry terminal, board the ferry, jump off midway across!