46 C.F.R. § 78.23-1 Unnecessary whistling prohibited.
Title 46 - Shipping
(a) The unnecessary sounding of the vessel's whistle is prohibited within any harbor limits of the United States. (b) [Reserved]
Title 46: Shipping
PART 78—OPERATIONS
Subpart 78.23—Whistling
§ 78.23-1 Unnecessary whistling prohibited.