Don't have a number, but the consensus has been that gps data use shouldn't be a problem. Can't wait for iOS 6 for the new maps program. It's one of the things I severely miss about android (went to an iPhone in February). I often use Waze GPS app (it's free). It aggregates all the data from other users of the app to help warn you of traffic and police, and will reroute if traffic is a problem ahead of you. Only problem I have with it is that when you finish using the program, it keeps running in the background so that it can use your data, like your speed, to help the other people using the app. This in turn leavees the gps on, which drains the battery fast. So when you are done using it, need to double push the home button and close out the app.



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