Navigon for the iPhone or Android. Then you won't have problems, you'll get voice instructions all the time (foreground or background, if you want, or not), and you won't pull from your data plan.
If only we could hook the iPhone video-out to the iDrive display and it would be perfection.
M3 Cabriolet; Le Mans Blue Metallic.
. . . .Munich . . . >. . . .Houston
When one wants a cabriolet, is there really any other choice than an M3? No. No, there's not.