A bit off topic, but as a “youth”, I spent my summers on Northeast Pond in Milton. Half of the lake is NH and the other half ME. It’s a very small lake, but since it borders 2 states, we did have periodic visits from the Coast Guard. I remember a few times being asked “permission to board” my 12’ – 9 ½ HP boat by the CG
We also had NH and ME marine patrol. Markers were a bit of a cluster, though mostly NH. Depending on where you were determined who would stop you unless it was CG and the could do it anywhere.
https://www.google.com/maps/place/No...!4d-70.9670683