title: iOS CoreLocation, Determine user leaving a location
body: <p>I've been working in a iOS location tracking application, and we've found a way to determine when users are leaving a place, but we're doing it by constantly listening to location updates, which ends draining our battery.</p>
  
  <p>What is the most efficient way to do a thing like this? i would like to get a battery consumption similar to the reminders application.</p>
  
  <p>Any idea is welcome! </p>
  
  <p>Thanks!</p>