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Re:Verizon Names Data-Draining and Battery-Killing Apps by buzzkillr2 on Monday February 11, 2013 @03:44PM (#5203085)
You can lock the display and the voice directions still subsist. The battery drain is from the constant polling of GPS information in my experience though.
Re:Verizon Names Data-Draining and Battery-Killing Apps by runeks on Tuesday February 12, 2013 @01:07AM (#5205442)
> The battery drain is from the constant polling of GPS information in my experience though.

Why would that use a lot of power though? It's just receiving a signal. I have the impression that it's when sending out a signal that a lot of power is used. And in that sense electromagnetic radiation at GSM, Wifi or visible spectrum-frequencies are all the same.

I'd say it's both keeping the screen on and constantly downloading new map information from the cellular network.