I want to buy a gps/fishfinder for my boat, but what is a chartplotter? Do I need one to cruise offshore?
I plan to move my boat from a lake in PA. to the Hudson River to expand my cruising. I want to cruise he intercoastal waterway in the northeast eventually and take my boat to Cape Cod and Nantucket, where I vacation every year. Do I need a chartplotter or is a gps sufficient?

