Both on the simulator and the device, my delegate for LocationManager is getting didUpdateToLocation:fromLocation: exactly every 5 minutes while traveling while monitoring SLC. Why is this?
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According to the CLLocationManager Class Reference:
For applications that do not need a regular stream of location events, consider using the startMonitoringSignificantLocationChanges method to start the delivery of events instead. This method is more appropriate for the majority of applications that just need an initial user location fix and need updates only when the user moves a significant distance. This interface delivers new events only when it detects changes to the device’s associated cell towers, resulting in less frequent updates and significantly lower power usage.
My guess is that when your app is running in the background, iOS only "wakes" the app every 5 minutes to check whether you have made a Significant Location Change, in order to conserve battery life
There might be some useful information for you also in this previous question.
