Hi All. I just did a quick and dirty tool to plot TAS and Ground speed to visualise any ASI errors. Takes G3X Logs. Just add Airspeed correction to centre the AS Diff circle. It does need enough data in opposite directions..
Does it account for the effect of crosswind? I.e., if you have a wind from the west, the average GS from two runs on 090 and 270 degrees will be different from the average GS from two runs on 000 and 180 degrees, assuming the same TAS on all legs.
This is a graph of the TAS without alteration. The idea is to adjust the "Air Speed Correction" to centre the "AS Diff"(red) on the rose. With it centred, the "Air Speed Correction" is the error in the pitot/static system. This actually means the "AS Diff" in the crosswind is ignored because it is always at or near zero.
I have calibrated my WOT True Airspeed at 116k however the G3X shows 113k. Is there a way to put a correction factor into the Garmin resulting in the TAS displaying 3k higher?