Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.110.150 Block Island Sound, N.Y

(a) The anchorage ground. A 3/4 - by 2–mile rectangular area approximately 3 miles east-northeast of Gardiners Island with the following coordinates:  latitude 41°06′12″ N., longitude 72°00′05″ W., latitude 41°07′40″ N., longitude 72°01′54″ W.;  latitude 41°08′12″ N., longitude 72°01′10″ W.;  latitude 41°06′46″ N., longitude 71°59′18″ W.

(b) The regulations. This anchorage ground is for use of U.S. Navy submarines. No vessel or person may approach or remain within 500 yards of a U.S. Navy submarine anchored in this anchorage ground.