Findings on Oct. 1 suggested that usage of Maps in iOS 6 fell to just four percent, from 35 percent at launch on Sept. 19. Afterwards the results from Snnapli's were questioned, though the service is defending the findings.

"We were not looking at the total amount of data used by the app. Our goal was to measure popularity, not how data hungry the app was, not the impact of vector graphics," Snappli said on its blog. Findings also covered five days before and after users installed iOS 6.

Data shortly after launch revealed that iOS 6 was installed 15 percent of devices just days after its launch. The results seemed to suggest that the lack of new features cited by critics was not affecting iOS' performance.

The obvious reason for usage reduction is because of the poor service. Photos of key structures in the U.S., like New York's Statue of Liberty or the Brooklyn Bridge, were either gone or half-destroyed. Following the news Apple's Chief Executive Officer Tim Cook apologized publicly for the service. He even recommended alternatives, including rival service Google Maps.

Apple also encouraged users to downloads apps from the App Store, having a page promoting mapping services. Users may ask why Apple is promoting rival services to a flagship feature of iOS 6. Regardless of problems Siri had in non-U.S. territories, Apple continues to push the personal assistant.

Apple reportedly developed Maps for five years; unlike Google providing services like StreetView, Apple acquired companies to provide 3D rendering technology like Flyover. For turn-by-turn navigation, which was positively received, TomTom and Yelp provide directions. However, users have reported wrong directions and being sent to empty areas. The initial reaction to the service was positive, with routes presented clearly.

In the midst of Apple's troubles, Google pointed users towards Google Maps' integration in Android. The company is developing a Google Maps app for iOS, though when it will arrive is unknown. Speculations indicated that Apple remove Google Maps because it wanted Google out of iOS.

iOS 6 is available to download now via iTunes or over-the-air on devices.