Utilization of Apple's iOS 6 Maps app appears to have plummeted in the days since its release. According to one study from data management company Snappli, only four percent of users running iOS 6 are still using Apple Maps, a dramatic drop from just a week ago, when the app debuted. Snappli's figures also show that Apple Maps usage is far below the levels the company saw when Google's Maps app was the standard on iOS.