Documented boats
Boats that are documented are as Kamper said done through the Coast Guard. Requirements are, among other things, that 1) the boat be registered in a state (bow #'s are not required to be displayed, but the sticker is), 2) Boat has a name, and 3) home port is listed on the stern with a name.
Boats can not be registered in more than one state at a time. So, if you are going to have your boat in NH, even if you live in MA or another state, you are required to have it registered here. However, this is very difficult to enforce because the Marine Patrol would have to be able to prove that your boat was actually on the water for the whole time.
Generally, boats on the lake are not documented, but certainly can be if the owner wants to go through the hassel. Ususally it is larger boats, and it may be an insurance requirement.
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