Fig. 30 - Example of calculated measurement configuration of type "QNH - WMO Table"
The type QNH - ISA, instead, uses the formula ISA nr. 7 indicated in "CIMO/ET-Stand-1/Doc. 10 (20.XI.2012)"
(§ Fig. 31).
Fig. 31 – Reference to equation No. 7 given in "CIMO/ET-Stand-1/Doc. 10 (20.XI.2012)"
Fig. 32 - Example of calculated measurement configuration of type "QNH - ISA"
Lastly, the type QNH - ICAO uses the formula defined by ICAO, indicated as nr. 28 and 29 in ICAO Doc 7488
and 9837, which allows to achieve results very close to the standard ISA formula (error less than 0.02 hpa up
to 2000 m).
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