Adjusting Wheel Ratio for E8000?

[Nash04]

Noticed that my E8000 mileage/speed is off when I use my Samsung Active 2 GPS which I checked it while driving the car so the watch is correct but computer is off by .20 every mile.

Is there away to adjust/fix that issue?

Thanks

 

[rancher52]

Like to know to having a Trek Powerfly 7, it's off using Factory mileage verses my GPS Android 8s, being GPS shows about .2- .1 further distance than bike