[RKDinOKC]

Love all that electronic gizmo stuff. But do admit I have to sit in the driveway with the vehicle running and go thru the manual to figure out how to use them. They are not what I would call intuitive and every system seems different.

Every one of the stereo/nav manufacturers need to take classes on user interface like they offer for software and video game development.
Don't ever take one of these classes yourself, it will increase your frustration with their lack of usability.