The U.S. Coast Guard defines a personal water craft as a jet drive boat that is less than 13' in length, to differentiate the pwc from larger size vessels with jet drives.
So, how does that compare to the New Hampshire definition for a personal water craft?
http:en.wikipedia.org/wiki/Personal_watercraft
Saw one rider go by flasher buoy-3 today, on either a jet ski or personal water craft, at about 2-pm, heading north, moving along more slowly than usual, going maybe 20-25-mph, and wearing either a full wet suit, or a black dry suit & pfd.