The Coast Guard is establishing a temporary moving security zone of 500 yards surrounding tank ships while within the waters of Puget Sound and adjacent waters, WA. All vessels within 500 yards of a tank ship shall operate at the minimum speed necessary to maintain a safe course, and shall proceed as directed by the Official Patrol or tank ship master. The Official Patrol will consist of a Coast Guard patrol, or a General Authority Washington Peace Officer, Limited Authority Washington Peace Officer, Specially Commissioned Washington Peace Officer, or the tank ship master. This order is issued under the authority of the Ports and Waterways Safety Act, Title 33, U. S. Code 1221 et. Seq., and the regulations issued thereunder, Title 33, Code of Federal Regulations Part 165.