About 5% of the time when I go to the Nav's address book, the letters at the appear backwards along with a '$' mixed in the middle somewhere. I'll take a picture of it one of these days. It shows up something like this...
2006 330i Monaco Blue | Grey | Walnut
...Manual | Sports | Premium | Cold | Nav | Comfort Access | PDC | Sirius | Sunshade
...M-Tec Steering Wheel | M-Tec Shifter | TLC
...Performance Center Delivery | Oct 14, 2005