My information is strickly word of mouth, I don't have an official MP source to back this up. Those are for the boat noise testing. If the NH Marine patrol thinks your boat is too loud they can make you do a live test. They moor a small boat there with sound equipment and you have to drive by.
Given the relatively new stationary measurement law, they might not do them so often.
I anchor near there a lot and I've never seen a test, of course most of my anchoring is on weekends.
I have seen the MP doing anchoring and landing practice near there on Timber. A older MP did the same drill two or three times, then had his new guy repeat it.
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