How GPS Works, Step 4: Knowing where a satellite is in space

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In Review: Satellite Positions

	To use the satellites as references for range measurementswe need to know exactly where they are.
	GPS satellites are so high up their orbits are very predictable.
	Minor variations in their orbits are measured by the Department of Defense.
	The error information is sent to the satellites, to be transmitted along with the timing signals.

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