The ONcoach 100 has been tested on a sample of more than 90 people walking or running at a comfortable speed.
The error detected on the number of steps when running was +/- 3% for 68%. It was higher for the rest of users.
The error detected on distance when running was +/- 15% for 68%. It was higher for the rest of users.
To improve the accuracy of distance measurement when running, you can calibrate it from the application in the “My ONcoach 100" / "Calibrate my ONcoach 100" menu.