[Code of Federal Regulations] [Title 33, Volume 3] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 33CFR401.41] [Page 672] TITLE 33--NAVIGATION AND NAVIGABLE WATERS CHAPTER IV--SAINT LAWRENCE SEAWAY DEVELOPMENT CORPORATION, DEPARTMENT OF TRANSPORTATION PART 401_SEAWAY REGULATIONS AND RULES--Table of Contents Subpart A_Regulations Sec. 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.