http://www.theguardian.com/technology/2013/nov/11/apple-maps...
"But a year on, a total of 35m iPhone owners in the US used Apple's maps during September 2013, according to ComScore, compared to a total of 58.7m Google Maps users across the iPhone and Android base.
Of those, about 6m used Google Maps on the iPhone, according to calculations by the Guardian based on figures from ComScore. That includes 2m iPhone users who have not or cannot upgrade to iOS 6, according to data from MixPanel."
Now, that's comScore data and since I've worked in that industry and I can tell you that the data is sampled and therefore could be off by a factor - but that, combined with what Apple said at WWDC makes it more likely that Apple's data is right.
It is the advantage of being the integrated application in the operating system.
There is no way to make Google Maps/or any other application the default one on iOS and any map link goes to Apple Maps
That's a bold claim. Are there any sources on this?