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Old 6th Jul 2010, 11:50
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Cough
 
Join Date: Jul 2000
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Dial up a vor/dme.

Compare radial/distance from the raw data with an FMC generated position via the fix page (Boeing) or the PROG page (Airbus). If result is > 2nm the position is unreliable, inhibit GPWS (if it doesn't have independent GPS) and fly the aircraft using raw data.
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