If the CSX 3D pedometer is registering more (or less) miles than walked through your journey you will need to check the stride length setting.
The CSX Pedometer will track your number of steps accurately, but it calculates the distance travelled based on your stride length.
If you find that the pedometer has measured a distance longer than you actually walked you will need to reduce the stride length set in the pedometer. If for instance you are doing a lot of hill walking you may be using a shorter stride length than the one you set, if you have a mixture of hills and flat walking you may need to find an average stride length to use. If you are running, it's likely the stride length will need to be increased.
To change your stride length on the CSX 3D Pedometer visit this page: