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Odometer vs GPS
Odometer does take in account climbing slopes, while GPS donīt.
The best way may be to calibrate odometer (or mpguino) in a flat surface with GPS, make a conversion table and then trust odometer.
However, if you want to measure only arc flat distances (kind of X, Y coordinates), GPS is correct and you donīt need corrections or conversions.
If you want to consider "real" miles traveled, odometer is correct as it measures on kind of X, Y, Z coordinates. Remember that we move on a sphere surface. Earth is not flat.
As someone said, they measure different distances. If in good shape, both are approximately correct in their own measures.
Oldbeaver
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