The iGolfGPS v3.0 software allows a GPS enabled* PDA or Smartphone to provide the distance to the front, center and back of the green from anywhere on the course. A four player scorecard and shot tracker feature is also included. *This software DOES NOT make your device GPS enabled. Your device MUST be GPS enabled. Please refer to your user manual to determine if the device has an internal GPS receiver, or if it requires purchase of an external GPS receiver.