Mine was all over the place after moving it around a lot - factory spin down with the Wahoo app fixed it. The time taken to spin down was significantly quicker after calibration.
I move mine every day and only calibrate ad hoc if I think about it or felt the power from the PM was off.
Also calibrated when I swapped bikes because the new bike has no PM so figured it was as good a time as any.
@hippy started
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Mine was all over the place after moving it around a lot - factory spin down with the Wahoo app fixed it. The time taken to spin down was significantly quicker after calibration.