iphone: audio turn by turn directions

Hey guys,

what iphone app do you use to get audio turn by turn directions? I can use that when I'm in the car with mom hehe

I know there's like a zillion GPS apps out there, but I'm looking for one that gives audio turn by turn directions while in the car.

does google maps do it? or do you use a different one? My newphew used one in my moms car the other day, I know he has an iphone. I asked him which app he used, but he didn't tell me. I asked him several times and he wouldn't answer. apparently its some big secret I don't know about lol

I wouldn't mind paying for an app with that functionality, but without purchasing a bunch of different ones just to see which one does that?

I tried google maps but I didn't see the audio turn by turn functionality, it just gives visual directions.

thanks