Why must Einstein's equations be factored into Global Positioning System (GPS) operation?

Answer

To correct for satellite speed (Special Relativity) and gravitational field differences (General Relativity)

GPS requires accounting for both special relativistic effects due to the satellites' speed and general relativistic effects due to the weaker gravitational field they experience relative to Earth's surface to maintain accurate synchronization.

Why must Einstein's equations be factored into Global Positioning System (GPS) operation?
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