My brother is a motor yacht captain based out of PC and he does deliveries in the area a lot. PM me if you want contact info; I am sure he would be happy to answer questions or point you toward someone who can. He cruises with someone else paying expenses and has to be responsible for some very expensive boats, so his choice in marinas tends toward the high end. But he knows where the water is deep and what areas are dicey.
Newport 17 - "Kohanna"
At sea Darwin's hypotheses is the final arbiter of right of way.