{"data":{"id":"us/33-cfr-81.1","jurisdiction":"us","citation":"33 CFR 81.1","heading":"Definitions.","body":"As used in this part:\n72 COLREGS refers to the International Regulations for Preventing Collisions at Sea, 1972, done at London, October 20, 1972, as rectified by the Proces-Verbal of December 1, 1973, as amended.\nA vessel of special construction or purpose means a vessel designed or modified to perform a special function and whose arrangement is thereby made relatively inflexible.\nInterference with the special function of the vessel occurs when installation or use of lights, shapes, or sound-signaling appliances under 72 COLREGS prevents or significantly hinders the operation in which the vessel is usually engaged.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER D—INTERNATIONAL NAVIGATION RULES","PART 81—72 COLREGS: IMPLEMENTING RULES"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"ba9b41b51b7d9fc6d018060093b965b9def2ba8d8e3163e5359746cf0a23ed66","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-80.1705","next":"us/33-cfr-81.3"},"notice":"GroundRules: Original legal text. Not legal advice."}