Burnie, the power-data cable plug on the 276 (in your photos, previous post) appears identical to the plug that goes into the button-pad portion of the BMW Navigator II. In other words, there is a cable that runs from the BMW Navigator II itself (the GPSR) to the button pad, and the part that plugs into the button pad has the same connection.
I wonder if Garmin is coming out with a new standard for power-data cable configurations here?
PanEuropean