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If it has a single slot it's the Navigation Business, not Professional.
It also has a smaller screen, 6.5" compared to 8.8" in Prefessional.
You will not get a map view, just arrows guiding you. Check this with your dealer. The price for this is a good deal lower than the Professional
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2006 E90 320D Sparkling Graphite
Aluminium trim|black Dakota leather|Xenon|Comfort Access|Sports seats|Steptronic|iDrive Professional|Bluetooth|Voice|PDC front & rear|sun shade rear window & sides|auto dim outside & inside mirrors|Comfort|Dynamic|Advantage
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