When the GPS is enabled but not in use, does it drain battery? If the GPS is enabled (in the notification view at the top, the GPS icon is enabled), but the app doesn't use it, does it drain battery? I understand that GPS drains battery because it requires a different component to be charged up. Or does the fact that the GPS is enabled only mean that the App can use it?
The GPS icon in the status bar means that an application is currently using the GPS so it is draining the battery. GPS does not however drain any battery just because you have it enabled in the settings menu.