CFR›Title 46›Chapter I›Part 173 ContainsSubparts A–ECorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 173—SPECIAL RULES PERTAINING TO VESSEL USE Subparts A Subpart A—General Section 173.001 B Subpart B—Lifting Sections 173.005–173.025 C Subpart C—School Ships Sections 173.050–173.063 D Subpart D—Oceanographic Research Sections 173.070–173.085 E Subpart E—Towing Sections 173.090–173.095 Authority43 U.S.C. 1333; 46 U.S.C. 2113, 3306, 5115; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.3.SourceCGD 79-023, 48 FR 51045, Nov. 4, 1983, unless otherwise noted. Previous 172 Part 172—Special Rules Pertaining to Bulk Cargoes Next 174 Part 174—Special Rules Pertaining to Specific Vessel Types