I haven't used it for a while, I tend to use tomtom on my advantage now.
The voice recognition is pretty basic from memory, you record your own voice tags, it doesn't do fancy stuff like understanding an address.
The PDA version is what you need.
Start here
NAVIGON AG - Products - Car Navigation
Hope that helps, sorry, i'm ultra mobile just now so that's the best I can do for you at the moment.