Google Search 3.0 for iOS Adds Google Now
GPS Always on
Turned it off and the icon went away. I would think this would be a battery drain issue if Google Now is always using your GPS location.
So if you want, say the weather, you don't ask it to give you the weather, you just look at your screen and low and behold, the weather information is already there for you before you asked for it.
Google Now learns your patterns so that it can tell you what you want to know without asking.
That is why you don't turn it on and off.
As far as the effect on battery life, I haven't noticed one since my Galaxy Nexus was upgraded to Jelly Bean last summer.
Coming from a 2+y/o Samsung Droid Charge, so this is a big upgrade for me.
Newest version of Android.
Lots of new stuff for me to experience...
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