Originally Posted by KiwiJochen

They work in other VDO-Dayton based systems, syuch as VW Phaeton, VW, Range Rover (BMW-based RR), Rolls Royce, Mini, and I think the French put VDO in some of their cars...??

I don't believe the maps are locked to any one vehicle manufacturer, however the POI data may be specific to a particular vehicle maker - eg: vehicle service centres.