The 2006 you have must have been modded by someone then mate, as AFAIK, Dutch is not an OEM option (I think).

Looking at the pic you posted (or the map image), I'm not sure where or how it could be done either...

I've not looked into the Business map disc as I've never had to use it.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.