About GPS
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.
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Positioning (GPS)