Easiest way to set accurate QNH is set the Altimeter to the field elevation. Field elevation can be found in FMB. Attached file has every airfield's elevation in the Sim all obtained from FMB.
A 1mb error should only result in 30ft/10m error.
I do believe the default maps have some diurnal variation in both Temperature and pressure. I too have seen 992mb as the setting on ATAG at some times and 995mb at other times.
Last edited by IvanK; 06-05-2012 at 10:54 PM.
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