Originally Posted by
Vessbot
Pure speculation, but I think there's a good chance that the position, installation, and compressibility error corrections are applied by the computer to the speed before we see it, thus making it actually EAS; but they don't label it that because IAS is the entrenched common term, and you don't want to confuse pilots.
I don’t think there is any compressibility correction.
Please see
Old Smokey thoughts from 15 years ago.