Section 147.877 - Safety Zone, Heidelberg Spar, Outer Continental Shelf Facility, Green Canyon 860(a)Description. The Heidelberg Spar in the deepwater area of the Gulf of Mexico at Green Canyon. The facility is located at: 27°6'41.0394" N, 90°45'50.3994" W (NAD 83) 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 for the following: (1) An attending vessel, as defined in § 147.20 ;(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.(c)Requests for permission. Persons or vessels requiring authorization to enter the safety zone must request permission from the Commander, Eighth Coast Guard District or a designated representative. If permission is granted, all persons and vessels shall comply with the instructions of the Commander or designated representative.USCG-2021-0476, 88 FR 21472 , Apr. 11, 2023