About a Drivers length - or 4 feet - directly behind the ball, aligned with your target line.
Initially, this may seem close and feel like you may strike the phone during your backswing. However, as long as the phone is between 4-6 inches off the ground, most golfer’s backswings will pass well over the top of the phone as the club is taken back.
GolfTrak will accurately measure the distance to the ball and provide prompts if the ball needs to be shifted to within the ideal shot detection area. Follow the prompts on the phone or Apple Watch to move it to within this area.