Infiniti M I'm Days Away From Purchasing A 2006 Infiniti G35 Coupe, And Don't Know Which Way To Go With Navigation.

I'm days away from purchasing a 2006 Infiniti G35 Coupe, and don't know which way to go with Navigation. - infiniti m

Has anyone on the aftermarket navigation system to know DigitalWheelz.com available? I do not know exactly determine how to surf the G35, but do not give it at a later date that the digital system Wheelz is trash!
Any help is welcome! Thank you!