Anyone know how updates to the navigation system are handled? One dealer told me you receive DVD updates periodically and automatically (no additional cost). Another dealer (who also sells Acuras) said you had to pay $200-300 for an update. He may have been thinking about Acura (I know Honda charges for updates). Anyone heard a consistent answer on how updates to the nav system happen for Mazda? I plan on owning the car for a long time, so updates will be needed if I get integrated nav.