MBTA boat - Wikipedia
https://en.wikipedia.org/wiki/MBTA_boat• F4 Boston (Long Wharf)–Charlestown Navy Yard service runs year-round on weekdays with ferries operating on 15-minute headways at rush hour and 30-minute headways at other times, and on a reduced schedule on weekends. The fare is $3.70; Zone 1A passes on CharlieCards are accepted. Boat service between Boston and Charlestown ended in 1786 after the comple…