Apple’s iOS 6 Maps app already showing signs of improvements
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That being said, it's going to take time as well as money for Apple to even marginally close the gap. Google has a tremendous lead when it comes to data. e.g. Just having a place on your map arguably isn't enough when Google probably has a dozen user reviews just for your local neighborhood dry-cleaner! No doubt that's why Apple initially tried to ram their maps down all iOS users' throats.