You look at the map on the phone and see the blue dot moving.

Then the car turns a corner… and the blue dot turns too.

But the phone isn’t looking out the window.

So how does it know you just turned?

It turns out your phone is quietly listening to satellites in space.

Tiny signals travel down to Earth every second.

By measuring how long they take to arrive, the phone figures out exactly where you are.

Suddenly the blue dot doesn’t feel like magic anymore.