Magellan Gold
The blue is the original track and the red with dots is the trackback.
(The trackback is quite faithful to the curves of the
original trail.)
Garmin GPSmap 76
The red is the original track and the screen shot is the trackback.
(The trackback has little relationship to the curves of the original
track.)
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Vista: Saved track of a figure-8 traverse
Trackback of the Saved track has little relation to the saved track
Screen captures using
Ozi Eplorer and G7ToWin