This is a good thread explaining all the connectivity options:
http://www.f30post.com/forums/showthread.php?t=696802
I don't have Nav in my F30 and, having thought long & hard about it, will stick with the std Business Nav in my upcoming F32 M Sport (rather than pay extra for Pro Nav) because, frankly, nothing I have read suggests it's worth it. Each to their own, particularly if you value the extra screen real estate and traffic updates!