Not a BMW, but MK3 navigation.
 

Hello guys again ...
I am playing a little bit with Peugeot RT-2 (MK3) navigation.
Original software CD is in CD-i file system, so I haven't any ability to write in that format,m but luckily I found out that MAPS cd is in ISO9660 Mode2/Form1 format, so I gave it a shot with mode2cdmaker (modified version of TOC). After burning , put in GPS and a version of GPS and CD appeared ( but version of CD was blank), anyway tried to update, but stucked at software initialization window. Never mind repaired with org OS8 disc.

When with Magic ISO edited TOC a little - added 'pd' to 'application' field, and now GPS shows CD version with now problems, but stucks at the same place like before.

Here is CD-i TOC table:
http://s14.postimage.org/ods4m47gd/cdi.jpg

Here is ISO TOC table:
http://s14.postimage.org/usr5ise65/iso9660.jpg