Okay, I'm new to this forum. I feel like I've got an easy question, but I've searched for hours and haven't been able to find the answer. Probably my incompetence.

My questions are;

I've got a 2008 X5 with a Nav system. What is it? a MK IV? Other?
What OS am I running?
Do I need to upgrade it?

The bottom line is that I'm having some issues with my nav system and I want to get the newest OS and Maps DVD. Many websites mention MK III or MK IV and I just don't know what I've got.

Any help you can give would be appreciated.