Found within the FAQs for the Navi:
If I find an error in the database, how do I report it?
If the error pertains to a highway or "verified" main road (shown as dark-colored streets on the display), report it online at:
http://update.navteq.com.
If the error involves a light- brown "unverified" road, do not report it. These areas are provided for reference only.
For errors in points of interest, keep in mind that the database may be out of date, depending on when the data was collected and when your DVD was purchased.