C.F.R. » Title 33 » CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY › SUBCHAPTER NN—DEEPWATER PORTS › PART 150—DEEPWATER PORTS: OPERATIONS › Subpart H—Aids to Navigation

33 C.F.R. § 150.720

What are the requirements for sound signals?

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The sound signal on each pumping platform complex must be operated whenever the visibility in any horizontal direction from the structure is less than 5 miles. If the platform is under construction, this requirement may be met by the use of a 2-second whistle blast, made every 20 seconds by a vessel moored at the platform.