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285 - ATPL Question Bank in English - During conventional IFR airway flight using GPS for lateral navigation, which altitude source is used to comply with assigned altitudes and flight levels?

Question 285 - Radio Navigation - ATPL - Airline Transport Pilot Licence

Barometric altimetry using the required QNH or standard-pressure setting.
GPS altitude if 4 or more satellites are received otherwise barometric altitude
GPS altitude
The average of GPS altitude and barometric altitude

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