World 4 · How GPS Finds You · 7 min · PRO

Trilateration

Circles that cross

PRO · Map Lab

World 4: How GPS Finds You is part of PRO

The first world of Map Lab is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

Satellites that shout the time
The fourth satellite
Einstein inside your phone
Why the blue dot wobbles
Great circles

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All 60 labs — every world, every lesson
Practice exams and certificates

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