If you set your GPS location in the editor and it will not open to the correct location in the player here are a few things you can try:
1. Make sure wifi is enabled on your device. In order for the GPS to work, wifi must be turned on.
2. Ensure that your location services are enabled. This can be done in the device settings.
3. Check that the radius is large enough to detect the location. In the editor, you can change the radius of the GPS. Make sure to increase the radius to a larger area.