If you use an Apple Watch paired with your phone, GPS distances on Apple Watch are based on the actual location of the iPhone to which it's paired.
We recommend staying within 10 yards of your iPhone to avoid pairing disruption.
However, we offer a standalone version for Apple Watch. All you need to do is turning the Bluetooth 'Off' and the watch will use its own GPS showing you distances to the Front, Center, and Back of the Green.
Note: If you decide to input scores via the Watch they will not be synced to your phone