Understanding GPS

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The US GPS system is a collection of satalites placed in a geosyncronous orbit around the earth. By knowing exactly where these satalites are with regard to the earth, comunication with a GPS device can be triangulated to calculate it's postition as well.

The standard for this is constantly in a state of flux, but at this moment, the system is defined by the WGS-84 standard.

File:WGS84 Manual.pdf

Wgs.gif