IO540 - how high did you fly for the calibration check? Averaged GPS will give you a TAS. Need to apply the squart root of the relative densities....
I would have thought that if your averaged GPS reading was equal to your ASI at altitude, then your ASI over-reads....
(I know it's not the answer to your question, viz how does a calibrator work, but might be useful to think about)
Thinks - does your formula include altitude?
Last edited by 'India-Mike; 12th March 2007 at 20:44.
Reason: had a thought about altitude being in formula