gistfile1.m

- (void)startCoreUpdate {
    if (!_locationManager) {
      self.locationManager = [[[CLLocationManager alloc] init] autorelease];
      _locationManager.delegate = self;
      _locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
      _locationManager.distanceFilter = 80.0f;
      _locationManager.purpose = NSLocalizedString(@"GeoPhoto uses your location to find nearby photos", nil);
    }
    [_locationManager startUpdatingLocation];
}