When Apple upgraded its operating platform to the iOS6, the company decided to dump rival Google's Maps system and replace it with its own product. When the service debuted in September, though, a host of problems arose. Users quickly noticed incorrect information, such as confusing Greenland with the Indian Ocean. Some images were only in black and white, and some points on the map were obscured by clouds. The fiasco was so bad that Apple CEO Tim Cook wrote a public letter apologizing for the mess. When Apple's senior vice president of iOS software, Scott Forstall, refused to sign the letter, he was shown the door. As the company tried to solve the problem, it recommended using its competitors services. This month, Google maps returned to the iPhone and became the most downloaded app in the iTunes store less than a day after its release.