You are totally correct. With iOS 4 the significant location changes API can be trusted with distances around 1 mile / 1.5 kilometers. Anything below that and y

You are totally correct. With iOS 4 the significant location changes API can be trusted with distances around 1 mile / 1.5 kilometers. Anything below that and you don't have any guarantee. I speak from my own experience developing GPS Notifier for iOS (http://jetap.com http://jetap.com and AppStore: http://itunes.apple.com/us/artist/jetap/id400203653 http://itunes.apple.com/us/artist/jetap/id400203653). My first version was only using significant location changes and after a lot of users feedback, the second release was improved dramatically by switching the way I was using the significant location changes API and some other GPS API: the app now has a better accuracy and the feedback from my users has almost disappear. Anyway congrats for the OP to ship his app! Enjoy the ride in the AppStore.