>> You can't know what is affecting what. In aircraft altimeters the
>> barometric pressure is set to local pressures as you go along if
>> you are low level and to 29.92 inches of mercury if you are ifr.
>> The idea is that everyone in the same area/altitude will at least
>> be using the same base setting and be able to know what altitude
>> they are at.

> Dave... you're going to end up hurting someone if you use 29.92
> every time you're IMC like that.

> You're actually supposed to use the closest known correct altimeter
> setting to your location.  And ATC has requirements

United States rules & procedures are not international.  I have
not flown IFR outside the US, but I believe that other countries
require setting altimeters to 29.92" Hg at much lower altitudes
than the US' requirement of 18,000 feet.

Dave's fully qualified domain name ended in .CA, which implies
he is in Canada.  He may very well have been quoting the correct
procedure for Canadian IFR.  I don't have Canadian equivalent of
the FARs handy (nor do I want to take the time to go searching).

                                                Lee Jones

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