SIGMA RC 14.11 - Manual (Page 26)

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6 CALIBRATION AND CORRECTION FACTOR
6.1 DO I hAVE TO CALIBRATE?
6.2 CALIBRATION FUNCTION
Calibration is not obligatory. If the deviation from the determined
distance is 5% or less, no calibration is necessary. If the deviation
is far more than 5%, we recommend calibrating your device.
The precise calibration process is described in the section below.
The running computer has a calibration function. To calibrate, put on
the R3 transmitter and the running computer and run a known distance.
You can measure a distance in advance with a bike computer or run
on a 400-meter track. After you have run the distance, adjust the
measured value to the actual distance run.
As your running or walking styles change as you change speed,
the calibration is carried out for both a slow and fast speed.
For the sensor positions chest and hips, you can perform two
calibrations:
k Walking
k Running
Important: Perform the calibration at least twice over a distance
of 800 m (800 m slow and 800 m fast).