Before go, check in the Service Menu to ensure that GPS reception is working OK. Here is a post that explains how to get into the Service Menu and what to look for: http://www.xoutpost.com/607084-post2.html.

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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