[Code of Federal Regulations] [Title 46, Volume 1] [Revised as of Octobery 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR35.20-35] [Page 473] TITLE 46--SHIPPING CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PART 35_OPERATIONS--Table of Contents Subpart 35.20_Navigation Sec. 35.20-35 Whistling--T/ALL. The unnecessary sounding of a vessel's whistle is prohibited within any harbor limits of the United States. [CGD 95-027, 61 FR 26000, May 23, 1996]