QFE to QNH app for iPhone and iPad

This is an App for professional pilots. It converts heights in metres QFE to altitudes in feet QNH.

When an elevation is recognised the App names the airfield and runway(s) to facilitate rapid cross-checking between Pilot Flying and Pilot Monitoring (some Russian airfields at release with more to come).

Altitudes are rounded up to the nearest 10 or 100 feet according to selection.

Conversion of QFE (hPa) to QNH (hPa) is provided, rounded down to avoid inadvertent flight below approach minima.

Also included is a conversion from metres standard to flight levels, rounded up or down to the nearest flight level.

Source code is available to AOC-holders for safety audit purposes.