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You hope ;) Significant location change is based on cell phone towers. The update only seems to happen when you switch towers or are switching between towers. L

You hope ;) Significant location change is based on cell phone towers. The update only seems to happen when you switch towers or are switching between towers. Less towers = less accurate, more towers = more accurate. Also, a kilometer is optimistic, good test and article here describes what was discovered when iOS4 came out. http://longweekendmobile.com/2010/07/22/iphone-background-gps-accurate-to-500-meters-not-enough-for-foot-traffic/ http://longweekendmobile.com/2010/07/22/iphone-background-gp... iOS 5 is now in beta, there may have been improvements, can't say for sure.

yoda_sl 15y ago
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.