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From Fellrnr.com, Running tips
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===Getting the best data===
The best run to use for calibration is a run that has the most accurate GPS data. That will be a run that is reasonably straight, as twists and turns tend to reduce the [[GPS Accuracy|GPS accuracy]]. A good view of a clear sky can also help a little.
===Is there a better way?===
A better approach would be to run a known distance, either on a track or using a known course and calibrate against that known value. The GUI version allows this type of adjustment.