How does GPS pinpoint your exact location anywhere on Earth?

GPS uses special space satellites to tell you exactly where you are on Earth, like a super-smart map that knows your position from up in space.

Imagine you have a toy phone and three friends standing far away. Each friend has a watch, and they all start counting down at the same time. When they say “go,” they each shout out their location so you can figure out where you are. GPS works kind of like that, but instead of friends, it uses satellites in space.

Each satellite sends a message with the exact time it was sent. Your phone gets this message and calculates how long it took for the message to arrive, just like you would count how many seconds passed between your friends' shouts.

By using messages from at least three satellites, your phone can figure out where you are on Earth, just like you could find your position by comparing the times from three different friends. The more satellites used, the better and more accurate the location becomes, kind of like having four or five friends helping you instead of just three!