33 CFR 81.1 - Definitions.

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§ 81.1 Definitions.
As used in this part:
72 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.
A 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.
Interference 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.
[CGD 77-136, 47 FR 13799, Apr. 1, 1982]

Title 33 published on 2013-07-01

no entries appear in the Federal Register after this date.

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United States Code
U.S. Code: Title 33 - NAVIGATION AND NAVIGABLE WATERS
U.S. Code: Title 49 - TRANSPORTATION
Statutes at Large
Presidential Documents

Executive Order ... 11964