Good for a grid
This app does provide a grid and a general location of where you are on a 1:50k map. Their are several other free apps that do this as well. The $ of the app should be free since the map data is very limited. You can NOT use this as a map for navigating. The images are too far out to see any details of where you are exactly or depicting terrain that is changing steeply. This app is basically good for getting a grid or finding a general location. It does not help you in any way pre plan a route.
seamonkey50 about
Land Nav Assistant