Apple Nike + iPod Sensor - Manual (Page 15)

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Note: Even after calibrating, the accuracy of the distance
measurements may vary depending on gait, running
surface, incline, and temperature.
Using iPhone or iPod touch, you can calibrate
Nike + iPod using the workout you just finished. You
can only calibrate workouts that are a distance of a
quarter mile or more.
To calibrate iPhone or iPod touch using your latest
completed workout:
m m Tap End Workout, then tap Calibrate. Set the correct
distance you ran or walked and tap Done.
The device updates with the new calibration to override
the previous one for a walking or running pace.
To reset Nike + iPod calibration to the default setting:
m m iPod nano (5th generation or ealier): Choose
Nike + iPod > Settings > Sensor > Calibrate > Reset Walk
(or Reset Run).
m m iPod nano (6th generation): Choose Settings > Fitness >
Nike + iPod Sport Kit > Sensor > Calibrate > Reset Walk
(or Reset Run) > Reset.
m m iPhone and iPod touch: Choose Settings > Nike + iPod,
then tap Reset Calibration.