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The code QNH is used in:
- the pilots request for the "atmospheric pressure at sea-level". In their reply ATC will repeat QNH followed with the pressure.
- automatic weather reports via ATIS.
Obtaining the current QNH in FlightGear
If QNH is not available but the elevation of the departing airfield is known, set the altimeter to it instead. The resulting QNH is the correct one. It is also possible to use QNH from a nearby airfield.