Use Location Only.
Apps optimized for iOS 8 have three options under the Location permissions in Settings >Privacy > Location Services. In addition to Never and Always, a third option called “While Using the App” is now available. This actually lets apps access location only when in foreground, and not in the background. Background location access can lead to severe battery drain, so the addition of this new mode is great news for those who want to use Location based features of an app, but not while running in the background. Choosing this setting is very recommended!