How Can a Tiny Chip Know Where You Are?

Imagine a tiny chip that can find you like a magical map. It listens to messages from satellites high above the Earth and uses them to know where you are, just like how your phone knows where you are even when you're walking in the park.

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Examples

  1. Your phone finds you in the park by listening to messages from satellites.
  2. A GPS chip in a car knows where it is, even when there are no street signs.
  3. Your watch can tell you how far you’ve run, because it listens to space signals.

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