i-Boating: Marine Charts & Gps is a free marine and freshwater app, with a wealth of information.

Our marine and freshwater charts contain the most up-to-date maps available. The app includes a map of Lake Michigan, the Great Lakes, and other lakes. It also has maps of lakes in the Canadian provinces, which can be found here:

Alaska, New Hampshire, Vermont, Colorado, Minnesota, Connecticut, New Jersey, Maryland, and New York

The app also has information on other inland rivers:

Canadian, Delaware, Colorado, Minnesota, Connecticut, New Jersey, Maryland, and New York

The app also has maps of rivers in Belgium, the Netherlands, and Germany.