StacksVerified U.S. regulatory reference

33 CFR §147.831

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Description. Holstein, Green Canyon 645 (GC 645), located at position 27°19′17″ N, 90°32′08″ W. The area within 500 meters (1640.4 feet) from each point on the structure's outer edge is a safety zone. These coordinates are based upon North American Datum 1983.
  2. (b)Regulation. No vessel may enter or remain in this safety zone except the following:
    1. (1)An attending vessel;
    2. (2)A vessel under 100 feet in length overall not engaged in towing; or
    3. (3)A vessel authorized by the Commander, USCG Heartland District.