1. Check if the ‘Location’ settings are enabled in the mobile device.
2. Check if the ‘GPS’ is enabled in the mobile device.
3. Reset your mobile device network settings by going to Settings > General > Reset > Reset Network Settings.
4. Reset your mobile device airplane mode by going to Settings > Airplane mode.
5. Check if the GPS antenna is physically connected properly.6. Re-install GPS related applications from the App Store if necessary.
7. Check if all the available GPS satellites are visible.8. Restart your device and try again.