GPS Benefits
Autofarm Autosteer	A GPS system the drives machines
Trimble Level	GPS controls a machine making ground level
Topcon Machine Control	How machines are control to level ground
How does GPS work	A good description of how GPS works
The Social Effects of the Global Positioning System	An article about the social benefits of GPS
A GPS Tutorial	How GPS works from a maunfacturer of GPS equipment
Earth Scope	How GPS is used in America to detect earthquakes
Galileo	How various applications may use the European Galileo system
Galileo	Documents about the Galileo system

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