If you tend to use Power Saving Mode very often, there is a chance that the phone has Power Saving Mode enabled which is the reason why the GPS is not working as expected.
Power Saving Mode disables some important functions like Wi-Fi and GPS. It may be very helpful when you are trying to save battery but if you are trying to use your GPS, you must disable Power Saving mode.
If you have Power Saving Enabled you can shut that feature down while you use the app.
Here is how: Settings>>Battery>> you should be able to see “Battery Saver” select Battery Saver and on the next screen you should be able to turn off Battery Saver.
You can always go back and turn that feature back on after your round of golf.