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One a PC prepared flightplan (SkyDemon Plan 3.6.6.0) I consistently see groundspeeds that seem about 3 to 5 knots too high as opposed to what I calculate with an E6B:
TT W/V IAS WCA GS(SkyD) GS(E6B)
099 240/10 80 5 91 87
178 240/10 80 4 78 75
258 240/10 80 -2 74 70
334 240/10 80 -7 84 80
I had set IAS to 80, and W/V explicitly to 240/10. Alt in all cases is 3000.
Am I missing something - or is this a error ?
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