The GAME GOLF PRO has built-in Smart GPS - it does not need to use your phone's GPS. The term GPS stands for Global Positioning System. When we talk about Smart GPS we are referring to our GAME GOLF Smart algorithm which interacts with the GPS satellites in pinpointing where your exact GPS location is. Our algorithm then uses this data as you play your round and transmits the location back to your phone. If you have any more questions on this, please contact firstname.lastname@example.org.