The app calculates the distance you have traveled from the starting point. You can use if while driving or walking. It tells you the TOTAL DISTANCE you have traveled.*** This is LITE and thus AD based version. For AD free, purchase the PRO version from market. ***The app connects your device to satellite, fetches your position, and then as per your position changes, it adds up the distance. We plan to add more features to this app, let us know if you have any suggestions.