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Title 33: Navigation and Navigable Waters
CHAPTER I: COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
SUBCHAPTER E: INLAND NAVIGATION RULES
PART 86: ANNEX III: TECHNICAL DETAILS OF SOUND SIGNAL APPLIANCES
Subpart A: Whistles
86.01 - Frequencies and range of audibility.
The fundamental frequency of the signal shall lie within the range 70-525 Hz. The range of audibility of the signal from a whistle shall be determined by those frequencies, which may include the fundamental and/or one or more higher frequencies, which lie within the frequency ranges and provide the sound pressure levels specified in ? 86.05.
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