33 CFR § 401.41
Tandem lockage
August 2, 2023
§ 401.41 Tandem lockage.
Where two or more vessels are being locked together, vessels astern of the leading vessel shall:
(a) Come to a full stop a sufficient distance from the preceding vessel to avoid a collision; and
(b) Be moved into mooring position as directed by the officer in charge of the lock.