Why does GPS need multiple satellites?
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Answer: Calculate precise position
Increase signal strength — Wrong. More satellites don't strengthen signal. Multiple satellites are needed for trilateration—calculating distance from each to pinpoint your location.
Cover more geographic area — Wrong. Constellation coverage matters, but even in one area, your device needs signals from 4+ satellites simultaneously for 3D positioning.
Calculate precise position ✓ — Correct! GPS uses trilateration. Each satellite transmits time-stamped signals. Your device calculates distance from signal travel time (light speed). 3 satellites determine 2D position (latitude, longitude), 4th adds altitude. More satellites improve accuracy. The GPS constellation has 24-32 satellites ensuring 4+ are always visible anywhere on Earth. Math requires multiple measurements!