wrote in message
k.net...
Here in the US, the barometer setting used is either the local setting
when below 18,000'
MSL or 29.92 when at or above 18,000' MSL. This is according to FAR 91.81.

My question is on understanding how this works in Europe (and other
airspaces
besides the US).

Canada has a 'Standard Pressure Region', and an 'Altimeter Setting Region'.

The 'Standard Pressure Region' is all airspace over Canada at or above 18000
feet, and all low level airspace that is outside of the lateral limit of the
'altimeter setting region'. (The 'low level airspace that is outside of
the lateral limit of the altimeter setting region' is essentially the arctic
and high arctic.)

While operating in the 'Standard Pressure Region', the altimeter is set to
standard pressure, which is 20.92 In.Hg, or 1013.2 mbs. (Except that for
departures and arrivals the airport altimeter setting is used, when
available, or, for departures with no altimeter setting available, the
elevation of the given airport)

While operating in the low-level airspace in the Altimeter Setting Region,
the altimeter is set to the altimeter setting (if known) of the given
airport for departures and arrivals, and otherwise the nearest station, and
otherwise the station nearest to the route of flight.