2001 X5 Navigation System - Help!

[asepulveda]

Guys,

First of all, this is a great website, all the information is posted is really valuable and I have learned a lot by reading them during the last couple of days.
I purchased a used 2001 X5, it runs great and the navigation system works well as well. I am not really sure about the version of the OS loaded on it, and I am pretty sure that the system uses CD´s and NOT DVD (i didnt see any DVD logos under the CD slot). I would like to know if it´s possible to upgrade the OS version to the latest version posted (V.28). If yes, what are the benefits of having a newer Nav OS? and second, where can I find most updated MAP CD´s?

I appreciate your help, I am a newbie and I am kind of lost....
THANKS!