Question about turn by turn nav and USB audio

[newdeal]

Ok so here is my question. I have a Chevy silverado, it has a USB port to get audio from a device into the car. If I am running my ipad with GPS and it is giving me turn by turn guidance will that go over the USB port also or is it just basically a way for the car to access audio files on the device? The car also has an aux input and I will assume that would allow for the turn by turn but its easier with only the USB as likely it would need that to charge anyway

 

[vidoc2]

Is this a quiz of a question? If you already have the nav app, then give it a try and let us know.

 

[newdeal]

...

I don't have an ipad (sold it already) or a nav app. My ipad was a wifi model but I am going to buy a 3g model for gps when the ipad 2 hits and I never had this car when I had my ipad before so I never had a usb option