The app displays the direction and distance to the saved target location based on GPS location information.
When you hold the device in a horizontal position in front of you, the gray arrow shows your latest movement seen by the GPS sensor, the blue arrow shows the direction to the target location and the red dash shows the compass north.
Additionally the app shows your latest measured speed and compass direction as well as distance and compass direction to the target location.
Once the target is selected, the target selection button is disabled until explicitly released with a menu action.
This application uses your location information only to determine and display distance and direction to the target location.