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What is the measured unit for atmospheric pressure and the computed and reported unit for QNH and QFE?
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ICAO Annex 3

4.6.7 Atmospheric pressure
The atmospheric pressure shall be measured, and QNH and QFE values shall be computed and reported in hectopascals (hPa).

Note: Inches of Mercury (In.Hg) are frequently used in the USA.

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