I wonder what road laws would say about the item itself obstructing views if it should be used in the older BMW's with not mush space for addition up there...
There is a Garmin version of this (at the bottom of the first page in the link Lizzard posted). I purchased it from Makro last year. It does force you to purchase a +R500 Navigation app tho. It worked relatively well. I ended up returning it and swapped it for a Dremel.