As discussed on the 'help forum'
Flighttrack displays all my logs colored in stripes. The source of igc
files is winpilot
The problem is that your track log is sampled every second, but the
altitude is only sampled every two seconds.
FT uses a very simple algorithm to compute the vetical speed at a
point. It simply divides the altitude difference between two samples
by the time between them. Therefore, every other point, FT thinks
that the vertical speed is zero and displays the appropriate level
This might be fixed in a latter issue but it might not be obvious to fix
that without affecting 'normal' tracks. One possibility might be to
change the algorithm and make the average over three samples (two
segments) to compute the vert speed.
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