FL flown vs true height
Hi all,
Firstly, sorry if this question appears as SLF question but hopefully you'll see it isn't quite totally silly.
Have recently arrived in Hong Kong from LHR and during the later stages of the flight noticed that the pass display had at us at FL375. My shiny new hand held GPS (used with crews permission) had us at FL385 (or 385,500 feet give or take to be more precise).
Unfortunately it didn't occur to me to check the OAT and I have no way of knowing actual QNH but does this seem like a reasonable difference allowing for likely standard atmosphere deviations over northern China at this time of year?
One slightly related question, do a/c over Russia fly at Flight Levels measured in feet or metres? Is Mongolia the same?
Cheers in advance,
UTR.