It appears that Apple used the weakest data set partner -- Tom Tom.
http://www.bgr.com/2012/09/18/apple-maps-ios-6-criticism-waze/
"Business Insider spoke with Waze CEO Noam Bardin about the iPhone’s new turn-by-turn directions, and the executive offered little praise. Waze, along with TomTom and some other companies, provides traffic information for the new mapping service, although Bardin’s comments suggest that Apple is relying predominantly on TomTom.
“Apple went out and partnered with the weakest player,” he said. “They’re now coming out with the lowest, weakest data set and they’re competing against Google, which has the highest data set. What’s going to happen with the Apple maps, is that you’re literally not going to find things. When you do find them, they might be in the wrong place or position geographically. And if you do have it, the route to it may not be the optimal route.”
Bardin revealed that a large number of mobile app developers have reached out to Waze and wish to integrate the company’s maps directly into their apps instead of Apple’s service.
“They’re saying many things that used to work on Google don’t work on Apple,” he said. “Going forward now, we’re going to see this around maps, it’s the question of how fast Apple can work with their partners to update the data and how good the user experience will be.”
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This will be a bigger disaster for Apple that antenaegate. At least in that case (excuse the pun) you could mitigate the problem by holding the iPhone 4 differently, or using it with a case.
There is NO WAY to mitigate the bad native mapping app for devices using ios6. And, I suspect, it will significantly delay adoption of the new ios on older devices.
Plus, now you have hundreds of thousands of businesses who spent a lot of time and effort marketing themselves via google maps who now have to scramble because Apple's native app won't show them. This is a monumental disaster. And, frankly, I don't know what Apple can do to fix it in the short run.