The Odometer over records mileage at a rate of almost exactly +20%.
In the car I also have a Terratrip 303plus. This shows speed and distance measured from a wheel sensor. The values for speed are virtually identical on both the Dash2 (GPS) and the Terratrip (Wheel sensor). The distance recorded is different by 20%.
Switching between miles and km makes no difference to the rate of the error.
How can that be?
![Confused :?](./images/smilies/icon_confused.gif)