Use your phone as a tape measure whilst standing still and without having to walk to the distant feature you wish to measure. Simply hold the phone at eye level and align the cross hair on the ground at the point you want to measure. The phone will display a continuously updated horizontal distance from the camera to the point under the cross hair. A one off calibration is required where you need to enter you eye level height i.e. the height from the ground up to your eyes. The distance is ca