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Title 33: Navigation and Navigable Waters
CHAPTER I: COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
SUBCHAPTER NN: DEEPWATER PORTS
PART 150: DEEPWATER PORTS: OPERATIONS
Subpart H: Aids to Navigation
150.720 - What are the requirements for sound signals
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.
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