Ok, thanks.

And by the way, with firmware v8.20 it seems that the 3790T unit is as accurate as it is before conversion. Did they include a driver for the old GPS module already?

And one more thing, I'm experiencing a discrepancy between the speedometer reading on the garmin unit and the speedometer on my car. They differ at about 8kmh, the speedometer of the car being faster. Is this because of the wheel configuration of my car? Does that mean the GPS reading is more accurate?