As of at least iOS 8.3, GPS works when in Airplane Mode! Let's go hiking! No more signal searching induced battery drain #iOS #CoreLocation
Like many other aspects of the latest update, Core Location has been shaken up, with changes designed both to enable developers to build new kinds of things they couldn't before and to help maintain user privacy. Specifically, iOS 8 brings three major sets of changes to the Core Location framework: more granular permissions, indoor positioning, and visit monitoring.