Discussion
Consider the following altimeter setting and datum pairs:
QNH - Mean sea level
QFE - Aerodrome level
QNE - Standard 1013.25 datum
QDM - Aerodrome elevation
How many of the pairs given above are correctly matched?
Answer: A
The first three are correct and cover the three datums an altimeter can be set to. QDM is a magnetic bearing to a station and belongs to radio navigation, having nothing to do with the pressure datum the altimeter references.
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