avantcrap

I realize this is probably a stupid question, but my model did not come with a nav unit (nor do I need one). Is there any way to rig the stereo to where I can connect my iPhone to it and control via the steering wheel?

Honestly, this is more for safety reasons than anything else.

I'm guessing my only options are to get an aftermarket nav or aftermarket stereo unit, but if anyone has any tips or tricks I would appreciate it.

Thanks!