CFR /  Title 33  /  Part 150  /  Sec. 150.350 What are the rules of navigation for support vessels in

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.