The law is headway speed. From RSA 270-D:1
VI. "Headway speed'' means 6 miles per hour or the slowest speed that a boat can be operated and maintain steerage way.
VIII. "No wake area'' means an area where a boat is to be operated only at headway speed
From RSA 270-D:2
I. Vessels shall be operated at headway speed only, while passing under all bridges
VI. (a) To provide full visibility and control and to prevent their wake from being thrown into or causing excessive rocking to other boats, barges, water skiers, aquaplanes or other boats, rafts or floats, all vessels shall maintain headway speed when within 150 feet from:
(1) Rafts, floats, swimmers.
(2) Permitted swimming areas.
(3) Shore.
(4) Docks.
(5) Mooring fields.
(6) Other vessels.
From Saf-C 400
Saf-C 401.08 “Headway speed” means 6 miles per hour or the slowest speed that a boat can be operated and maintain steerage way.
Saf-C 401.18 “No wake area” means an area where all boats are required to operate at headway speed.
Saf-C 402.88 Lake Winnipesaukee.
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(b) The Weirs Channel, so-called, between the light buoy in said channel near the Endicott Rock in Lake Winnipesaukee, and the southernmost light buoy in the channel in Lake Paugus shall be a "no wake" area.
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