BMW aren't stupid. They have paid Garmin to 'doctor' the hardware so that you can't fit the cheaper Garmin unit in a BMW cradle and use the extra buttons, they won't work unless you fit the BMW unit into the BMW cradle. It's only worth paying more for the BMW Navigator units over the equivalent Garmin units if you really need the extra buttons on the BMW cradle. (These buttons are replicated on the touchscreen of the Garmins anyway).
Not sure about the ZUMO units but this applies to the Nav2/2610 and Nav 3/2820.
Not sure about the ZUMO units but this applies to the Nav2/2610 and Nav 3/2820.
