How does GPS accurately determine your exact location on Earth?

GPS works by using special satellites that send messages to your phone or watch, telling them where they are and when they sent the message.

Imagine you're playing hide-and-seek with friends in a big park. Each friend calls out "I see you!" but you don’t know exactly where they are, just that they’re somewhere near you. GPS is like having four super-smart friends in the sky who all call out “I see you!” at once.

Each satellite sends a message to your device, telling it how far away it is. Your phone uses this information to figure out where it must be, kind of like drawing circles on a map with each friend saying "You're somewhere in my circle!"

But here’s the fun part: you need at least four satellites to know exactly where you are. That way, your phone can solve a little math puzzle and find the exact spot where all the circles overlap, that’s your location!

So even though it looks like magic, GPS is just clever math and messages from space, like having four super-smart friends helping you find your way!