BH the law I copied says that boat engines made after 1976 have to be certified to meet the sound limits by the builder before they are sold. All boats have to meet the sound laws, but the laws give a small amount of slack to older boats.
270:37 Decibel Limits on Noise. –
I. No person may operate, sell, or offer for sale any marine engine which is capable of being operated in a manner which exceeds the following noise levels measured under any testing procedure established pursuant to rules adopted under RSA 270:39:
(a) For a marine engine manufactured in or before 1990, a noise level of 90 decibels when subjected to stationary testing.
(b) For a marine engine manufactured after December 31, 1990, a noise level of 88 decibels when subjected to stationary testing.
(c) For a marine engine manufactured in or before 1990, a noise level of 84 decibels on the "A'' scale, measured at 50 feet.
(d) For a marine engine manufactured after December 31, 1990, a noise level of 82 decibels on the "A'' scale, measured at 50 feet.
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