How does GPS navigation precisely locate us on Earth?

GPS navigation is like having a super smart friend who tells you exactly where you are on Earth using special signals from space.

Imagine you're playing hide and seek with your super smart friend. They can see you from way up high, but they don’t know how far away you are, just that you’re somewhere in the neighborhood. To figure out where you are, they send out special messages, like a countdown: "1... 2... 3..." Each message takes a tiny bit of time to reach you.

Now imagine your friend is actually four different friends, all sending out their own special messages from satellites in the sky. Your phone listens for these messages and figures out how far away each satellite is by counting how long it took for the message to get there.

By using signals from at least three satellites, your phone can pinpoint your exact location, like finding a treasure map that shows you exactly where you are on Earth!