Hi,
I'm from belgium. I did some calls to US and there they told me that there was a 'official' dealer in Holland. This is for the complete BeNeLux. (
http://www.kroymanshummerutrecht.nl/)
However the navigation system that Hummer is providing as standard for the US is not working here. They don't even have the EUROPE maps for it.
What the 'official' dealer suggested is to put a Kenwood or Pioneer system into it.
I would rather still love to have the standard navigation system from Hummer into mine.