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How do GPS and Satellite Navigation work:

In summary
  • satellites transmit signals to computer/sat nav in car
  • sat nav system in car receives these signals
  • depends on very accurate time references/atomic clocks
  • each satellite transmits data indicating location and time
  • sat nav system car calculates position based on at least 3 satellites
  • at least 24 satellites in operation world wide
  • sat nav system combines satellite information with mapping info 
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