Test yourself: 5 hard theory questions, free Airspace, weather, regs and aerodynamics, FAA-style — instant score, every answer explained. No signup.
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GPS determines position by measuring:
A
Doppler frequency shift from satellites
B
Signal strength from satellites
C
Pseudo-range (time delay) from at least 4 satellites
D
Phase difference between satellite signals
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See where you stand: 5 hard questions, instant score, every answer explained.