The Steamship Authority is the largest ferry service to the Islands of Martha’s Vineyard and Nantucket from Cape Cod. We offer the lowest fares and the most frequent daily departures for passengers, automobiles, groups and trucks. Nantucket ferries depart from Hyannis. Our seasonal high-speed passenger ferry, the M/V Iyanough, gets you to Nantucket, dock-to-dock, in just an hour.