How do GPS systems accurately pinpoint our location anywhere on Earth?

GPS systems use special satellites that act like invisible helpers above us to tell where we are on Earth.

Imagine you have a toy car that can drive anywhere in your house. If you had three friends holding flashlights from different corners of the room, and each friend could tell you how far away they were from the car, you could figure out exactly where the car was. That’s like how GPS works, it uses signals from satellites to find your location.

There are many satellites high up in space, all sending out messages. Your phone or GPS device receives these messages and calculates how long it took for each message to arrive. By knowing the time it takes for the signal to reach you, your device can figure out how far it is from each satellite.

Once your device knows its distance from at least four satellites, it can use some smart math to find where you are, like solving a puzzle with clues. This lets your GPS show you your exact location on Earth, whether you're playing outside or driving to the park!