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I was thinking the cabin pressure would be higher than ambient so discoounted the stat :-[ [smiley=embarassed.gif]ic as being the problem. Ofcourse that must be the problem, thanks.

My D10A has always indicated 10-15 knots HIGHER than my ASI and GPS (nil wind). I confess to having not connected the static air of the D10A. It shares the same pitot air as the ASI. I checked that it is set to knots and not mph or kph. Do I have to calibrate the D10A air speed or something? Can...