A line drawn from Charleston Light on Sullivans Island to latitude 3240.7 N. longitude 7942.9 W. (Charleston Lighted Whistle Buoy ``2C''); thence to a point on Folly Island at latitude 3241.0 N. longitude 7953.2 W. [USCG-2010-0759, 75 FR 60001, Sept. 29, 2010]