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Originally Posted by Winnipesaukee Divers

...From the lectures I have received from the MP's before, they can cite you for obstructing navigation for misuse of the dive flag...

Winni Divers has it right, below is the applicable RSA...note in particular subsection II...

TITLE XXII
NAVIGATION; HARBORS; COAST SURVEY
CHAPTER 270
SUPERVISION OF NAVIGATION; REGISTRATION OF BOATS AND MOTORS; COMMON CARRIERS BY WATER
Interference With Navigation
Section 270:26
270:26 Injuring Buoys, Placing Obstructions. –
I. Any person who knowingly removes, destroys, moves, or injures any buoy, beacon, or other navigational aid placed in, on, or adjacent to any of the public waters of the state for the purpose of guiding and protecting navigation and boating thereon shall be guilty of a misdemeanor.
II. Any person who knowingly places an obstruction dangerous to navigation in any of the public waters of the state without reasonable precaution to protect the public from such obstruction shall be guilty of a misdemeanor.
III. Any person who shall moor or make fast a boat, vessel, raft, or float of any description to a buoy, beacon, or other navigational aid placed in, on, or adjacent to the public waters of the state shall be guilty of a violation