De quoi est fait GPS (satellite navigation)
Finding a position from satellite signals.
- Artificial satellite — a pour partie. A constellation of satellites.
- Horloge atomique — utilise. The satellites carry atomic clocks; the position is calculated from signal arrival times.
- Ondes électromagnétiques — utilise. Radio signals.
- Theory of relativity — utilise. Corrections for the relativistic slowing of clocks.
- Silicon — est fait de. The receivers are silicon.