Useful links
There is a wealth of information about the BMW navigation system on forums and bulletin boards.
Bimmernav
Gpsunderground
Find lots of information and files for your BMW nav system.
Bimmersport
Bmwnav
Xoutpost
Bimmerpost
Navcoder
Hook your PC into your BMW's i-bus and manage the settings.
Siegenthaler
Joachen's information on changing the radio settings, etc.
Neil Oakley
OS software and other useful files.
Rolf Resler
Information and tools for the i-bus