Apple Nike + iPod Sensor User Manual
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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:
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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:
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iPod nano (5th generation or ealier): Choose 
Nike + iPod > Settings > Sensor > Calibrate > Reset Walk 
(or Reset Run).
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iPod nano (6th generation):  Choose Settings > Fitness > 
Nike + iPod Sport Kit > Sensor > Calibrate > Reset Walk 
(or Reset Run) > Reset.
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iPhone and iPod touch:  Choose Settings > Nike + iPod, 
then tap Reset Calibration.