Hi scully,

First thing you need to do is work out what type of sat nav stytem you have, CD or DVD, this will determine what map disc you need.

Do you know if the system firmware has been updated at any time.

To find out:
Go to the main menu. From there, click on the "SET" or "SETTINGS" selection. The type of your nav computer and OS will appear on the upper right corner of the screen.

The first digit tells you which version of the nav computer you have, and the last two digits tell you the OS version.

If the first digit is a "3," you have a MKIII computer. If you have a MKIII, then the newest OS version is 3-1/63.

If the first digit is a "4," you have a MK4 computer. If you have a MK4, then the newest OS version is 4-1/91.

OR

Look at the nav computer (the drive that holds the map cd) if it has DVD written on the front, then its a DVD based system, if not then its a CD based system, a mk3 (probably).

If you have a mk4 then you need a 2007-1 high dvd, if a mk3 then a 2007 map disc. Probably a good idea to upgrade the firmware as well.

Hope this helps

John