I was under the assumption that when enabled, GPS consumes memory and battery life, even if you are not executing an app that uses GPS. I installed the Mobile Defense App today and it requires some sort of locating device for it to work when activated such as Wi-fi or GPS. I know for a fact Wi-fi consumes battery life but the email from Mobile Defense states: "Contrary to popular belief, enabling the GPS doesn't actually mean the GPS is consuming any power. GPS will not start looking for signals unless a GPS enabled application is running." Does anyone have any insight on this? If this is the case, I will just always leave GPS enabled. Thanks!