Becarful when buying the chips. Many chips sacrifice detail for volume. My navionic chip has most sounding of the bay and includes most slips when you zoom in. It terminates at Cape May NJ and I believe the southern point is the mouth of the bay. I have depended on it to steer the boat when I could see or when I could believe what I was seeing (narrow channel with strong cross wind and currents). Went to Fl with a guy that had a chip of the east coast, it was almost useless. As you zoomed in the detail wasn't there, that's a problem, what good is 1/2 or 1/3 of the detail for the sake of fitting it on a chip. Its like giving a person a book map with most of the pages missing. I would want the see the chip detail or be able to return it if it isn't what you think it should be.