This is an excellent app for the Apple Watch. The GPS readings are identical to my friends $300 range finder with an annual fee. You can simply raise your wrist and have the distances to the front, middle, and back of the green. There were initial some problems with the GPS freezing with the Watch OS2 update, but they seem to have cleared up with version 3.1 of the app. Even if you dont have an Apple Watch, this is an excellent iPhone app. This is the best tool I have on the golf course!