CFR›Title 33›Chapter I›Part 81 ContainsSections 81.1–81.3; Subject groups Alternative Compliance–ExemptionsCorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 PART 81—72 COLREGS: IMPLEMENTING RULES Contents 81.1 § 81.1 Definitions. 81.3 § 81.3 General. Alternative Compliance Alternative Compliance Sections 81.5–81.18 Exemptions Exemptions Section 81.20 Authority33 U.S.C. 1607; E.O. 11964; 49 CFR 1.46.SourceCGD 76-130, 42 FR 17111, Mar. 31, 1977, unless otherwise noted. Redesignated by CGD 81-017, 46 FR 28154, May 26, 1981. Previous 80 Part 80—COLREGS Demarcation Lines Next 82 Part 82—72 COLREGS: Interpretative Rules