Great article about ultra-low Power in GeoFence
http://gpsworld.com/putting-the-ultra-low-power-in-geofence/
GPS World Blog: Geofencing and Location Apps Shouldn’t Be a Battery Killer
http://blog.broadcom.com/smartphones/gps-world-blog-geofencing-and-location-apps-shouldnt-be-a-battery-killer/
http://gpsworld.com/putting-the-ultra-low-power-in-geofence/
GPS World Blog: Geofencing and Location Apps Shouldn’t Be a Battery Killer
http://blog.broadcom.com/smartphones/gps-world-blog-geofencing-and-location-apps-shouldnt-be-a-battery-killer/