How does GPS know exactly where you are?

GPS knows exactly where you are by asking four special helpers called satellites to tell it how far away they are from your phone or watch.

Think of it like a game of hide-and-seek, but with clocks and distances instead of just counting numbers. Each satellite sends out a signal, kind of like a shout, that tells the time when it was sent. Your GPS uses that time to figure out how long it took for the signal to reach you, which means it can know how far away the satellite is.

Your phone talks to four satellites at once. Each one gives a slightly different distance. By comparing all these distances, your phone does some clever math and finds where all those distances meet, that’s your exact spot on Earth!

It's like when you use three pieces of string tied to different corners of a room and pull them tight, the point where they all meet is where you are.

GPS doesn’t need magic; it just needs time, distance, and a little bit of math, something you might do in school!