The availability and quality of GPS signals may be affected by your location, satellite positions, buildings, natural obstacles, weather conditions, and adjustments to GPS satellites made by the United States government. GPS signals may not be available inside buildings or underground.
Do not use GPS for precise location measurement, and never rely solely on the location information provided by GPS and cellular networks.
The coordinates in the GPS are expressed using the international WGS-84 coordinate system. The availability of the coordinates may vary by region.