Section 147.863 - Turritella FPSO System Safety Zone(a)Description. The Turritella, a Floating Production, Storage and Offloading (FPSO) system is to be installed in the deepwater area of the Gulf of Mexico at Walker Ridge 551. The FPSO can swing in a 360 degree arc around the center point of the turret buoy's swing circle at 26°25'38.74" N., 90°48'45.34" W., and the area within 500 meters (1640.4 feet) around the stern of the FPSO when it is moored to the turret buoy is a safety zone. If the FPSO detaches from the turret buoy, the area within 500 meters (1640.4 feet) around the center point at 26°25'38.74" N., 90°48'45.34" W. 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.USCG-2015-0318, 80 FR 71942, Nov. 18, 2015