I spent $15 for this app and I am terribly disappointed. It is very cheaply presented, with coloring-book-level colors. I live on and fish Table Rock Lake in Missouri and I thought this app would be a "breath of fresh air" and show detailed lake contours, stream beds, and accurate elevations. In reality it fails all these requirements. The lake contours are large numbers and show only very rough approximations of the lake depth (even some of the fully exposed islands are shown with water elevations)! There are NO STREAM BEDS shown to follow to keep from running aground in shallow water. This app needs a lot of detailed work. Dont waste your money.
Tatersoup about Marine Navigation-USA Lake Map