GPS knows where your phone is by using signals from satellites that are up high in space.
Imagine you have a friend who lives far away, but they can tell you exactly how far they are from you by sending you a message on your phone. GPS works kind of like that, but with many friends (the satellites) all around the sky.
How it finds your location
Satellites send out messages to your phone, telling it when the message was sent. Your phone gets these messages and figures out how long it took for each one to arrive. From that, it can tell how far away each satellite is.
By using signals from at least four satellites, your phone can figure out its exact spot on Earth, like solving a puzzle with clues from different directions!
Why it’s so accurate
Each satellite is moving very fast and has very good clocks inside them. These clocks help the phone calculate distances more precisely, just like knowing exactly when you start running helps you measure how far you go.
Your phone can even tell if you're walking or driving, because it knows where you were a little while ago!
Examples
- By using signals from multiple satellites, your phone can find your exact location.
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See also
- How do GPS systems accurately determine your geographic location?
- How do GPS devices pinpoint our exact location on Earth?
- How do GPS systems accurately pinpoint your location?
- How do maps know where you are using special signals from the sky?
- How do GPS systems pinpoint your exact location?