You do not have the older mk4 navigation system mate, you have the i-drive (probably a ccc version), to check if you can update via the v32 OS disc.

To determine which Nav OS software version you presently have in the i-Drive systems (Navi01, Navi02 or Navi03 Boot Mounted Units) you can enter the service mode by doing the following:

In basic menu display (N,S,E,W), press down the i-Drive Controller for 6 seconds.
(On some vehicles the help text flashes briefly when it is ready)
Turn Controller 3 increments clockwise. (Increment means turn)
Turn Controller 3 increments counter clockwise.
Turn Controller 1 increment clockwise.
Turn Controller 1 increment counter clockwise.
Turn Controller 1 increment clockwise.
Press Controller down to confirm.
Select "MOST Devices"
Scroll down to Navigation
Use the arrow down until you get to "Software version:" x.x.x hex

This V32 O/S Disk will upgrade your Navi01, Navi02 or Navi03 to :

NAVI01 = 7.3.20
NAVI02 = 8.4.40
NAVI03 = 9.8.02

__________________
Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.