An application that provides directions to a destination in real time using the GPS system of satellites. While both mobile and desktop navigation apps provide turn-by-turn directions, only mobile apps provide them in real time.
Most people call this a "GPS app," but the GPS system refers to the U.S. Global Positioning System that navigation apps use to pinpoint their location on the ground. The quality of directions is based on the app, not the GPS, but the location accuracy is based on both. See
mapping app,
GPS and
navigation system.