Create Custom Windows Phone Maps
Before you get started with your map, drag up the ellipses […] and select Settings from the main menu. Use this screen to select your preferred unit of measurement, either miles or meters.
You can then snap or load a map from your phone, before calibrating the selected image. Drag the ellipses once again to select Calibrate, where you will begin by tapping the map to add the first marker. This might be where you currently are, or a major landmark. Drag the marker into position and tap the check to confirm.
The app will then ask you to enter GPS coordinates, Latitude and Longitude. If you don’t know these, the GPS approximation is displayed below the fields, and you can tap this to populate them. Tap the check to Save, and then tap the map again to add the second checkpoint.
If you choose only one marker, the next step would be to apply a Scale to the map, otherwise you’re ready to start using your MapSnap GPS map!