Have you a real paper map? Have you a very good map on your computer (JPG)? Do you want to use these with the gps of your iPhone?
ShingleNav is the solution. You can import your map from internet or pick from the camera. You set two focus points and you will be ready to enjoy your map!
ShingleNav is also a very simple terrain navigator. The idea is to mark the starting position (home) and then navigate back. You simply follow the red line back home. It's also possible to navigate to any position selected from the map or using coordinates.