QNH

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QNH is a brevity code for "atmospheric pressure at sea-level". It is needed when starting or landing an aircraft, when it is important to have the indicated altitude as accurate as possible.

Uses

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 there is neither ATIS nor ATC available you can find the QNH value in Environment=>Global Weather.

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.