Section 150.900 - What does this subpart do?(a) This subpart provides requirements for the establishment, restrictions, and location of safety zones, no anchoring areas (NAAs), and areas to be avoided (ATBAs) around deepwater ports.(b) Subpart D of this part, concerning vessel navigation and activities permitted and prohibited at deepwater ports, applies to safety zones, NAAs, ATBAs, and their adjacent waters; and supplements the International Regulations for Preventing Collisions at Sea.(c) Recommended shipping safety fairways associated with deepwater ports are described in part 166 of this chapter.