Even if there are many questions regarding Android and GPS my doubt is really specific to the user level location settings.
Supposing I've enabled the GPS settings, say from the Power Control widget, and no application is actually requesting location updates.. what is the impact of this situation on battery life?
Does the settings location flag start some activity in background, maybe a location service?. Is some radio activity initiated by having the flag on? or can I assume that if no app will register for updates my battery life will be more or less the same?