How do I set Manual QNH?
In a competition, the organiser may give a QNH value to be used by the competitors. Setting the takeoff altitude correctly could be the difference between make or break in a competition.
If you can get accurate information from an external source (such as an ATC tower or competition task sheet) it is possible to manually enter the values as well.
To manually correct takeoff altitude or the QNH value:
Find this option via: Menu > Volume > Altitude.