I'm afraid I have to disagree with DR. DIESEL on this one. This has been the coldest winter in recent memory here in New Jersey, and I've seen fewer NAV complaints this year than ever before. I've seen plenty of COMAND malfunctions, but not many NAV problems. Since the vehicle in question is an early version, it may be worth checking to see if the COMAND unit has had the latest soft-ware update installed. There are several bulletins pertaining to early version COMAND units as well. Good luck