33 CFR § 401.44 - Mooring in locks.
(a) Mooring lines shall only be placed on mooring posts as directed by the officer in charge of the mooring operation.
(b) No winch from which a mooring line runs shall be operated until the officer in charge of a mooring operation has signaled that the line has been placed on a mooring post.
(c) Once the mooring lines are on the mooring posts, lines shall be kept slack until the “all clear” signal is given by the lock personnel. When casting off signal is received, mooring lines shall be kept slack until the “all clear” signal is given by the lock personnel.
(d) Vessels being moored by a “Hands Free Mooring” (HFM) system shall have a minimum of 1 well rested crew member on deck during the lockage to assist the Bridge team.