Tips: Improving phone GPS performance
Turn phone off/on
Turn location services off/on
Perform a GPS reset:
1. Double tap the home button. This will bring up tile sized images of all currently running apps. Swipe the screens of all apps upwards to close them.
2. Then go into settings and turn on airplane mode.
3. When you've done that go to settings, general, reset and choose reset network settings (you will need to re-enter your wifi passwords!)
4. Once your phone has reset go to settings, location services, turn it off then on again.
5. Then go settings > privacy > location services > system services, setting time zone OFF.