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I recently updated my iPhone to have the newest OS system - version 6. One of the new features is the navigation in maps. I used it today for the first time and thought it worked really well. I think the navigation could give warnings just a little bit earlier and there were times when I felt it was a bit off on the timing. Luckily I had a pretty good idea of where I was, so it didn`t matter, but if you are really lost this could be a problem. I also expected my phone screen to go black when not in use for say 20 miles when nothing is happening, but it stayed on the whole time using up battery. It would be nice if the screen would come on and off based on what is happening, just to save your battery. Those were my findings and overall am really happy this is a new feature on the iPhone.
Image Source: http://www.unwiredview.com/2010/04/23/iphone-to-get-google-maps-with-free-navigation/