My first question is... are you sure that you have navigation installed in the car? It sounds like you have the TV-only option. (Or, your car has both TV and navigation, but the nav computer has completely failed.) You can upgrade to a MKIV.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input