"Icebound" wrote in message
able.rogers.com...

"Mark Hewitt" wrote in
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"Really Me" wrote in message
m...



At or above FL240, express speed (IAS) in Mach
Below FL 240, express speed in knots

Any reason?



high altitude, low air pressu-- knots indication is inaccurate

I find, in Flight Simulator, that accuracy starts dropping off at
14,000 feet. MSL.