Section 401.40 - Entering, exiting or position in lock(a) Unless directed by the Manager and the Corporation, no vessel shall proceed into a lock in such a manner that the stem passes the stop symbol on the lock wall nearest the closed gates.(b) On being cast off in a lock, no vessel shall be allowed to fall back in such a manner that the stern passes the stop symbol on the lock wall nearest the closed gates.(c) Every vessel proceeding into a lock shall be positioned and moored as directed by the officer in charge of the mooring operation.(d) No vessel shall use thrusters when passing a lock gate or a Hands Free Mooring (HFM) unit.45 FR 52378, Aug. 7, 1980, and 47 FR 51122, Nov. 12, 1982, as amended at 48 FR 20691, May 9, 1983; 72 FR 2620, Jan. 22, 2007; 73 FR 9954, Feb. 25, 2008; 76 FR 13089, Mar. 10, 2011; 88 FR 14268, Mar. 8, 2023 68 Stat. 93-96, 33 U.S.C. 981-990 , as amended and secs. 4 , 5 , 6 , 7 , 8 , 12 and 13 of sec. 2 of Pub. L. 95-474 , 92 Stat. 1471