The Nike+ app allows you to track your runs on your iOS or Android device. The app relies on your device's accelerometer and GPS data -- if your device has GPS capabilities. If your device doesn't have GPS, if you run indoors or if you lose your GPS signal, the app may record the distance incorrectly. In this case, you'll need to edit the information manually.
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Tap the "Fine Tune Your Run" button that appears at the end of your run. Enter the actual distance if it's different than what Nike+ recorded.
Locate the run in the "Activity" tab of the app if you want to adjust the distance at another time. Tap the run and then tap the "Calibrate" button and enter the correct distance.
Contact Nike+ to edit any other incorrect information. As of 2013, you can only manually edit the distance of a run. For other changes you must contact Nike+ by phone or via its "Contact Us" webpage.