when you say upgrading the nav are you talking about the map itself? or is this a programming disc that's supposed to make the nav work better? i want to upgrade my 2003 nav and i have no idea what will work or what do do

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2000 Ferrari 360
2003 X5 4.6is
2004 Yamaha R1

1998 740iL (Sold)
1995 M3 (Sold)