I guess the range rover nav computer is pretty lousy, whereas the X5 uses a much better/faster setup. It’s plug and play. I know no one has any, but if anyone knows of a wrecked X5 at a yard, let me know!
Like this, but hopefully for a lot less dollars:
http://cgi.ebay.com/LNEW-BMW-MK4-GPS-Navigation-DVD-MKIV-for-5-7-E38-3-M-X5_W0QQitemZ170165579238QQihZ007QQcategoryZ73333QQssPageNameZWDVWQQrdZ1QQcmdZViewItem