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GPS accuracy

Outdoors it is very accurate, to about 10 feet. In areas of high buildings, or if any object obstructs the sky, accuracy degrades. Indoors GPS technology is ineffective, as line of sight to satellites is required. AngelSense analytics is capable of detecting which indoors place your child is located (home, school, etc), but of course will not detect the location inside the building.

Official U.S. government information about the Global Positioning System (GPS) and related topics

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GPS Reception Issues