(a) Description. The Mad Dog Truss Spar system is in the deepwater area of the Gulf of America at Green Canyon 782. The facility is located at 27°11′18.124″ N., 90°16′7.363″ W. and the area within 500 meters (1640.4 feet) from each point on the facility structure's outer edge is a safety zone.

(b) Regulation. No vessel may enter or remain in this safety zone except the following:

(1) An attending vessel;

(2) A vessel under 100 feet in length overall not engaged in towing; or

(3) A vessel authorized by the Commander, USCG Heartland District.