Quote:
Originally Posted by SPL
schmidtj — Presumably the NAV does the same as ScanGauge does. It allows recalibration of the speed signal (a single signal, not four) that it receives on the CAN bus from the car's ECUs. That is, the SPD signal is adjusted by the user's dialed-in correction percentage.
Stan
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I haven't actually done a recalibration but from the book you don't really dial in any corrections. You tell the NAV to calibrate and then drive until it says it's done. It measures wheel pulses and GPS satellite derived distance travelled during the calibration and automatically developes a miles/pulse algorithm from that. At least that's how I read it.