Measure the area and perimeter of a field? Determine the exact position of that border stone? Collect GPX-data and visualize at home? How to use: Simply press the green button "GPS WALK" and start walking. Now walk along the border of the area. If there is any obstruction just press "PAUSE" and move on to the next accessible point. Continue with "GPS WALK" or "GPS POINT HERE". Once you are done click "CALCULATE" and the app will determine the area and perimeter. The last position will autom