Has anyone tried to use CARiN maps for Pioneer, Phillips or CARiN maps for other vehicle manufacturers such as Opel/Vauxhall, Ford, Renault, Volkswagen or Rover in a BMW MKIV (HIGH) nav computer?

FYI, CARiN is a map format created by VDO-Dayton, and the map CD is identified by the following files:

• carinet
• carindb
• abstract
• copyrigh
• bibliogra

Do these CD's work at all in a Professional nav?

Apart from the BMW-specific POI, does anything not work, or behave differently?

Why? I was wondering if the latest digital maps could be bought cheaper from someone other than BMW...