I'm pretty sure NH follows the US Coast Guard requirements:
http://www.boatus.com/boattech/artic...quirements.asp
But an all around light must clear any obstructions, radar arch, radar antenna's, bimini's or other canvas, people in the boat, etc.
Even a single obstruction can be dangerous.
Here's the actual NH rules from:
http://www.gencourt.state.nh.us/rule.../saf-c400.html
Quote:
Saf-C 403.03 Classification of Boats.
(a) For the purposes of this part, motorboats shall be classified follows:
(1) Class A shall be for motorboats less than 16 feet in length;
(2) Class I shall be for motorboats at least 16 feet but less than 26 feet in length;
(3) Class II shall be for motorboats at least 26 feet but less than 40 feet in length; and
(4) Class III shall be for motorboats at least 40 feet but less than 65 feet in length.
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You can find the lighting requirements in: "Saf-C 403.15 Lights on all Motorboats" or "Saf-C 403.16 Lights on Non-Power Boats" via the link above.
Here is the NH diagram showing the lights: