What does qnh stand for

The hills or mountains on an air chart, field elevation, minimum safe altitudes on your XC etc. Different regions have different weather and there fore different pressure settings.

If your doing an epic XC, to stay accurate, you will need to adjust your settings as you cover different regions.

When this is set on your altimeter, It will read zero at the field and after take off will read your height above 'that' field. If you fly to another field of different elevation or different pressure the reading will be inaccurate.

QFE is very good for new pilots who are returning to the same field after a short XC. This one is the average mean sea level pressure around the globe. It is earths mean atmospheric pressure at sea level. Every day's a school day hope you learned something and please do share. If anyone want's to add anything There are a couple of minor things to add to the article, but only one is important On descending down below then you return to QNH. The less important thing is the terms Query Nautical Height and Query Field Elevation are actually an old housewives tale.

They are just two of a large number of historic 3 letter Q codes worth a google search that are not actually acronyms however many find it useful to use those terms to remember which is which.

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But from memory: It dates back to the early days of navigation when the main communication method was morse code through the radiotelegraph. I presume the other Q codes evolved in a similar manner. Ben Ben Can anyone think of anything it could stand for, so it's easier for people to remember? With reservation for the exact literal meaning.

Without having a reference for this Q-code origin, I believe this statement is a back formation. I will look forward to being proved wrong, however Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Featured on Meta. Now live: A fully responsive profile. Version labels for answers.