i know this is an old thread but:
make sure you get the right disc if its a vdo system. they will have 2 types. a carin disc and a CIQ disc (Both are Whereis maps).
i am lead to believe that the bmw nav systems are carin but double check against the original disc.
the difference between the 2 discs?
CIQ uses a "key" which unlocks the maps when its inserted into the nav system
Carin does not.
for more info, PM me, and ill try and help