147.1112—Platform HIDALGO safety zone.
        
        (a) Description:
         The area within a line 500 meters from each point on the structure's outer edge. The position of the center of the structure is 34-29-42 N, 120-42-08 W.
    
    
        
        (b) Regulations:
         No vessel may enter or remain in this safety zone except the following: (1) An attending vessel, (2) a vessel under 100 feet in length overall not engaged in towing or (3) a vessel authorized by the Commander, Eleventh Coast Guard District.