CFR › Title 33 › Part 401 › §401.4133 CFR §401.41Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkWhere 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.