Why GPS?
What is GPS?
How GPS Works
Triangulating
Measuring Distance
Getting Perfect Timing
Satellite Positions
Error Correction
Differential GPS
Putting GPS to Work
Glossary
The launch of the 24th block II satellite in March of 1994 completed the GPS constellation.
Four additional satellites are in reserve to be launched "on need."
The spacings of the satellites are arranged so that a minimum of five satellites are in view from every point on the globe.
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