Gps використовує мережу супутників для визначення місцезнаходження

GPS uses a network of a few dozen satellites in precise orbits around Earth, and receivers in devices like phones are constantly listening out for signals from those satellites. The devices can work out how far they are from any detected GPS satellite, and when they pick up signals from at least four of them, the device can determine its relative position on the ground to within a few meters.
And now Scientists have demonstrated a proof-of-concept for a new navigation system that can work underground and underwater by tracking particles from cosmic rays