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I'm looking into the new background location service options in the iPhone 4 SDK. It allows an app to run in the background and receive location updates from the device.
There are two methods offered. One is a battery intensive mode that continuously gets location updates. The second recommended method sends the app location updates when there has been a "significant location change".
Does anyone know what a significant location change might be? Is a 30 foot walk considered significant, or is a 10 block walk considered significant? I imagine it also depends on the accuracy of the location mechanism being used at the time.
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Cause. On devices running iOS 13 Apple periodically alerts users of applications that run in the background and access the device's location. The prompt includes a map of locations and requests the user to reconfirm the location access permission.
Background location useIf you give an app permission to access your location while it's in use, the app can then ask to know where you are at all times.
Open your phone's Settings app. Under "Personal," tap Location access. At the top of the screen, turn Access to my location on or off.
Go to Settings > Privacy, then select Location Services. Select an app, then turn Precise Location on or off.
I've recently done some field testing of the new background location service to get an idea of what constitutes a significant location update, what kind of accuracy to expect for the location hits and our general experiences using it.
The results are detailed in a fairly lengthy blog post:
iPhone Background GPS: Accurate to 500 meters, not enough for foot traffic
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