Hey! Among the critisism these days towards apple maps app, I found a good one: Turn by turn navigation does NOT reuquire data network or internet while driving! It only needs it for calulating and making the route plan. Of course internet data is needed in case of re-routing I noticed that while navigating, the wheel besides 3g (or LTE) is spinning, so I didnt want to consume too much data, so I turned the data and 3G off in the settings. And still worked! Im a newbie so maybe many of you know this, but if find it pretty cool, especially for the ones that, like me, do not have unlimited data plan. Cheers!