Except for persons aboard a vessel operating under a current Coast Guard Certificate of Inspection and in compliance with current Coast Guard regulations, a person aboard a vessel, raft, or tube shall wear a U.S. Coast Guard Approved Type I, II, III, or V personal flotation device (PFD) at all times while underway on the Upper Potomac River and its tributaries, during the period beginning at 12:01 a.m. each November 15, and ending at 12 midnight each succeeding May 15. At all other times a vessel, raft, or tube shall be equipped with a U.S. Coast Guard approved Type I, II, III, or V personal flotation device (PFD) for each person aboard while underway on the Upper Potomac River and its tributaries.