Naviter Support Forum

It looks like the ground speed in thermals is related to the sampling rate in the IGC file.
The higher the sampling rate, the higher the speed in thermals.
May be a correction factor is used to correct the speed if e.g. a circle exist only of 3 point because the circle going through 3 point is longer as a triangle. But if the same correction is used if a circle exist of e.g. 10 point, the speed will be to high? Is this true?

Actually, this is related to Nyquist sampling theory. The sample rate needs to be at least 2X the frequency you want to measure. So you need at least two sample points per circle to prevent aliasing. But cutting it this close would require a large number of circles to get usable results. Better to set the sample rate much shorter than 1/2 the circling time.

I use a sample rate of postion 1 per second . Seeyou reports ground speeds of up to 75 knots when thermaling despite wind speeds being below 10 knots, my indicated airspeed is about 45 knots. My club is using seeyou version 20. I guess there is somthing wrong with the way seeyou calculates speeds when thermaling.

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