Originally Posted by dotmit
On the digital display it gives you your current speed. So for example on the way home last night I had the cruise control set to 50mph but my instantaneous speed showed I was actually doing 48 even though the speedometer showed 50. It must get this speed from the GPS rather than the wheel sensors.
Mit, neither the speedo or the digital display are off the GPS. Basically, you can code the car to show the corrected speed (ie +10% or whatever it is that the EU suggests that speedos should show) or true speed. Generally the car will come coded to corrected speed (on the speedo) and when you code the digital speed, it is usually uncorrected (ie true wheel speed) unless you specifically activate the BC_DIGITAL_KORREKTEUR (I think) line.