Altitude data come from the transponder and should be correct. Vertical speed is also calculated, so errors can sometimes occur. The ground speed is calculated and can sometimes be incorrect, especially during turns and at low altitudes. Should give high positional accuracy during most phases of flight, but position errors can sometimes occur.
Terrestrial based tracking using the time difference of arrival to calculate position. Some older aircraft use inertial reference units instead of GPS for positions, decreasing positional accuracy. Satellite based tracking with very high levels of GPS accuracy for most aircraft. Terrestrial based tracking with very high levels of GPS accuracy for most aircraft.
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