33 C.F.R. § 150.350

What are the rules of navigation for support vessels in the safety zone or area to be avoided?

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A support vessel must not anchor in the safety zone or area to be avoided, except:

(a) In an anchorage area; or

(b) For vessel maintenance, which, in the case of a manned deepwater port, must be cleared by the port's person in charge of vessel operations.