[Code of Federal Regulations] [Title 33, Volume 1] [Revised as of July 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 33CFR67.10-5] [Page 167] TITLE 33--NAVIGATION AND NAVIGABLE WATERS CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PART 67_AIDS TO NAVIGATION ON ARTIFICIAL ISLANDS AND FIXED STRUCTURES --Table of Contents Subpart 67.10_General Requirements for Sound signals Sec. 67.10-5 Location requirements. The sound signal required by Sec. Sec. 67.20-10, 67.25-10, and 67.30-10 must: (a) Be located on the structure so that the sound signal produced is audible over 360[deg] in a horizontal plane at all ranges up to and including the required rated range; and (b) Be located at least 10 feet but not more than 150 feet above mean high water.