title: How to "turn off" location services when a map view with no location manager disappears?
body: <p>I have an <code>MKMapView</code> in a view controller where I call:</p>
  
  <pre><code>[self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
  </code></pre>
  
  <p>When I navigate to another view controller and the one with the map view disappears, I still have the location services running (I see the arrow in the status bar). I'd like to turn it off once I'm not seeing the map anymore, but I don't know how to do this without having a <code>CLLocationManager</code>...</p>
  
  <p>Thanks</p>