I'm fairly new to the avic world with my purchase of a used n3. When i first got it from my buddy the ver.60 Nav disc's were badly scratched. I downloaded the newest disc's the 80MT version, loaded them into the HU and everything worked fine. That was 3 weeks ago, and yesterday i went to use my Nav and it was unable to calculate a route to ANYWHERE !!! Not sure what's going on here, I tried using a len's cleaning disc but to no avail. Somebody out there .... PLEASE HELP A NEWBIE !!!