Hi guys, i just collected a new Aurion Prodigy without modification. I also have a Mio GPS unit. The speedo on the Aurion always shows around 5 km/h faster than the GPS. So if the speedo says 60, the GPS will show 55. On my housemate's Echo, the digital speedo reading and the GPS match exactly. Do you think the speedo on my new Aurion has a calibration issue ? Regards.