What RichardP1 means is that there is a "business navigation system" that doesn't have a big monitor but instead shows the "turn left 50m" in an simple and small ambar screen directly in the radio.

As far as I know, it's also a MKIV and it also uses our "High" DVD maps, so I just wonder if the system is exactly the same but uses different pins on the cable (which I don't know know which ones), or if it's just somehow a bmw recoded procedure to turn it "business".

Either way I have a feeling that the default behaviour is to use the monitor, so you should be safe by getting any MKIV.

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