CFR /  Title 46  /  Part 7  /  Sec. 7.15 Massachusetts Bay, MA.

A line drawn from latitude 4237.9 N. longitude 7031.2 W. (Cape Ann Lighted Whistle Buoy ``2'') to latitude 4222.7 N. longitude 7047.0 W. (Boston Lighted Horn Buoy ``B''); thence to Race Point Light.