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Attaching to the TV in Motion input is pretty much your only choice. Any way to interface a PC to the OEM nav display is not great, quality-wise. I looked in to it for my E46, but it seems the better solution is to pretty much gut the factory system and sell it as parts (you can get a few hundred for the Bluetooth parts, those are an expensive retrofit) and use a Lilliput in one of the bezels this site sells. I just have the Business CD unit, but would have upgraded to the Nav if I could have interfaced it better.
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I don't know what I'm doing anymore.
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