I&#39;m writing an application that requires background location updates with **high accuracy and low frequency**.  The solution seems to be a background NSTimer task that starts the location manager&#39;s updates, which then immediately shuts down.  This question has been asked before:

https://stackoverflow.com/questions/6347503/how-do-i-get-a-background-location-update-every-n-minutes-in-my-ios-application

https://stackoverflow.com/questions/10235203/getting-user-location-every-n-minutes-after-app-goes-to-background?rq=1

https://stackoverflow.com/questions/13377750/ios-not-the-typical-background-location-tracking-timer-issue

https://stackoverflow.com/questions/15650139/ios-long-running-background-timer-with-location-background-mode

https://stackoverflow.com/questions/10706265/ios-full-time-background-service-based-on-location-tracking

but I have yet to get a **minimum example** working. After trying every permutation of the above accepted answers, I put together a starting point.  Entering background:

    - (void)applicationDidEnterBackground:(UIApplication *)application
    {
        self.bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
            NSLog(@&quot;ending background task&quot;);
            [[UIApplication sharedApplication] endBackgroundTask:self.bgTask];
            self.bgTask = UIBackgroundTaskInvalid;
        }];
    
    
        self.timer = [NSTimer scheduledTimerWithTimeInterval:60
                                                      target:self.locationManager
                                                    selector:@selector(startUpdatingLocation)
                                                    userInfo:nil
                                                     repeats:YES];
    }

and the delegate method:

    - (void)locationManager:(CLLocationManager *)manager 
        didUpdateToLocation:(CLLocation *)newLocation 
               fromLocation:(CLLocation *)oldLocation {
    
        NSLog(@&quot;%@&quot;, newLocation);

        NSLog(@&quot;background time: %f&quot;, [UIApplication sharedApplication].backgroundTimeRemaining);
        [self.locationManager stopUpdatingLocation];
    
    }

The current behavior is that the `backgroundTimeRemaining` decrements from 180 seconds to zero (while logging location), and then the expiration handler executes and no further location updates are generated.  How do I modify the above code in order to receive **periodic location updates in the background indefinitely**?

**Update**: I&#39;m targeting iOS 7 and there appears to be some evidence that background tasks behave differently:

https://stackoverflow.com/questions/18901583/start-location-manager-in-ios-7-from-background-task

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Periodic iOS background location updates