I wonder if you have a bad map disk? What version do you have (there is a year printed on the disk)? And, is it the CD or the DVD map disk?

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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