172
edits
Altitude: Difference between revisions
Jump to navigation
Jump to search
m
improved some phrases in QNH paragraph
(moved QNH category in the "Indicated altitude" paragraph) |
m (improved some phrases in QNH paragraph) |
||
| Line 23: | Line 23: | ||
If there is neither [[ATIS]] nor [[ATC]] available you can find the QNH value in Environment=>Global Weather. | 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 | If QNH is not available but the [[#Elevation|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. | ||
To use a barometer (i.e. your [[altimeter]]) as a tool to measure the altitude, it must be corrected for weather influences. For this task, every airfield is equipped with an accurate barometer. By combining this value with the [[#True altitude|true altitude]] of the airfield, they can calculate the barometric pressure at [[Mean Sea Level]], the QNH. It will transmit the QNH via [[ATC]] and [[ATIS]] and with that piece of information the altimeter in the aircraft can be corrected for weather influences and will display an altitude close to the [[#True altitude|true altitude]] of the aircraft. This way the [[#Indicated altitude|indicated altitude]] will be quite accurate for a ''certain area around the airfield'' as long as the ''weather remains stable''. While on the airfield the altimeter would show the altitude of the airfield. | To use a barometer (i.e. your [[altimeter]]) as a tool to measure the altitude, it must be corrected for weather influences. For this task, every airfield is equipped with an accurate barometer. By combining this value with the [[#True altitude|true altitude]] of the airfield, they can calculate the barometric pressure at [[Mean Sea Level]], the QNH. It will transmit the QNH via [[ATC]] and [[ATIS]] and with that piece of information the altimeter in the aircraft can be corrected for weather influences and will display an altitude close to the [[#True altitude|true altitude]] of the aircraft. This way the [[#Indicated altitude|indicated altitude]] will be quite accurate for a ''certain area around the airfield'' as long as the ''weather remains stable''. While on the airfield the altimeter would show the altitude of the airfield. | ||