Hell the voice commands on mine are pretty snazzy. You can tune directly to radio stations etc. Push the on-wheel button with your thumb, it beeps, and you say (for example) "tune to ninety seven point one" and away it goes to 97.1 FM. It also understands that "six hundred" couldn't possibly be an FM radio station and tunes to AM 600khz.
Presumably you can use this for much more than just radio stations but I haven't experimented. In any case, the voice activation button shows data on the dash screen about what it's doing, and if you're stopped you can scroll through valid inputs etc.