Re: Altitude reading on aircraft

Date:         30 Mar 98 04:31:13 
From:         Rod Madsen <>
Organization: Netcom
References:   1
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All aircraft flying above 18,000 ft set their altimeters to a "sea level
barometric pressure" or 29.92 in Hg and they do determine their
"altitude" by this means.  They aren't too concerned what their actual
altitude is, just that they are not sharing any airspace with another
airplane.  If they all have this common understanding (and they do)then
nobody runs into anbody else.  That could explain the diference.