N.H. Rev. Stat. Ann. § 215-C:5

No person shall operate a snowmobile upon any lake or pond being used by ice fishermen closer than 150 feet to any occupied so-called bob-house, fishing shanty, or fishing hole, unless done at a speed in conformity with RSA 215-C:8, III. The provisions of this section shall not apply to any person engaged in emergency rescue operations or public service of any description.