How GPS works?

How GPS works? The short story of a time difference!

We take GPS and other GNSS systems (Galileo, Glonass, Beidou) for granted. They are there, they tell us where we are, and everything works "out of the box". However, all the GNSS/GPS system are fascinating examples of how amazing science and technology is! Do you know a GPS receiver can find its location only thanks to the delay of radiowaves and all GPS satellites emit actual date and time?

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