Townsend Gut has 3 "glacial erractics" that are unmarked. One of the people who lives along the Gut has sent numerous letters to the coast guard trying to make them rechart the area but has not gotten anywhere. Apparently several boats hit them each year. They are just outside of the 1' contour on the mainland side, boothbay end. I don't know exactly where they are but you should hug the other shore in this area. Sorry I couldn't give a better idea.
I also know that there are some chart issues in Hurricane sound. There is at least one sandbar on the western side near a few marked rocks that is uncharted. I will try to pull out the chart when I next get a chance and be more exact.