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GPS works by receiving timing signals from multiple satellites orbiting Earth. Because radio signals travel at a known speed, a receiver can calculate its distance from each satellite and use those measurements to determine position.

The astonishing part is not only that this works, but that it works so routinely most people stop noticing. Navigation apps, shipping systems, precision farming, and emergency response all depend on a quiet choreography of satellites, clocks, and mathematics.


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Reference:

Wikipedia: Global Positioning System

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