Private Pilot Licence · Practice

Civil aviation GNSS (e.g. GPS) determines a three-dimensional position primarily by:

• A.Receiving azimuth bearing information from a single geostationary satellite above the equator
• B.Measuring the precise time-of-arrival of coded signals from a minimum of four satellites and trilaterating.
• C.Measuring signal strength from each visible satellite and selecting the strongest for the fix
• D.Detecting the Earth's magnetic field gradient and computing position from field inclination data