I've just bought 2008 X5 (E70) and I seem to be having some issues with the Navigation...
When I start the vehicle or re-insert the Nav DVD, the unit shows my current location. As soon as I set off on a trip nothing happens, it just sticks with my original point of origin.
I have ordered and new 2014 DVD form
http://www.satnavupgrades.co.uk , might help you BIGOZUK, very good reviews, clearly states which disc for which vehicle and cheap enough to take a punt on.
If anyone can help with my issue also I'd be keen to hear back. The antenna must be connected for it to find my position... or am I just being really dense and missing something very obvious?