Pre-Programmed Data Card with Detailed coverage of Lake Huron, Georgian Bay, Lake St. Clair, Lake Simcoe, Lac Nipissing, and the Detroit River. Covers from Sault Ste. Marie to Detroit, including Saginaw, on the U.S. side, and from Sault Ste. Marie to Goderich, Ont., including Parry Sound, on the Canadian side.