I've had my avic d3 in my 02 maxima for about 3 years now.I've never had a problem until recently the navigation doesnt work.Every time i type in address and try to calculate the route, it never works and say "route cannot be calculated". I noticed the navi cd is pretty scracthed up, could this by why its not working? I just dont want to buy a new cd for no reason.I'd appreciate any helps.thanks

That's a possibility.

Why don't you toss in the other disc (West or East) and try?