Section 147.853 - Petronius Compliant Tower Facility Safety Zone(a)Description. The Petronius Compliant Tower facility is in the deepwater area of the Gulf of Mexico at Viosca Knoll Block 786. The facility is located at 28°13'44" N/-87°47'51" 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:(2) A vessel under 100 feet in length overall not engaged in towing; or(3) A vessel authorized by the Commander, Eighth Coast Guard District or a designated representative.USCG-2013-0874, 79 FR 52561 , Sept. 4, 2014