I have a 2006 C230 and recently bought the 2011 NAVTEQ DVD. It seemed to install okay (although there were no instructions) but after updating the software many of the addresses I have saved seem to now be "in an area where turn by turn navigation is not available" or lead me to an incorrect destination. Before I take back the DVD to the Mercedes Dealer I purchased it from, does anyone have experienced and been able to solve this issue?

Thanks!

Peter