NAV system Worth the money?

[voltmfg]

Is the Navigation system worth the extra money? How well does it work? Is it DVD based? Thanks in advance for the help..

[Mo0NDoGGie]

If your interested in getting a NAV (yes dvd based) you might wanna wait till the 07's come out this year because alot of people will be upgrading to the new one. It has lots of added features. The older ones will drop in price. ;)

[LTsMagRT]

what will be in the 07 nav's that we don't have in the 05's and 06's?