Here another hidden menue, in the GPS
Stating this point (in Englih, it is something like "map, car direction") :
Push the iDrive forward and right together
then :
turn 3x right
then 3x left
then 1x right
then 1x left
then 1x right
and finally push the iDrive
You will arrive here:
and last push the iDrive to the right, you will get that. After you can navigate
Here is the demo mode. Use with caution !!! :