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kurichan 07-19-2009 02:02 PM

GPS and Battery Use
 
Does anyone know whether leaving GPS turned on on a device like the Storm or the Tour uses up battery juice if you don't have an application which accesses the GPS running?

Also, does an app like Google Maps use juice running in the background (regardless of GPS) or does it "sleep?"

hrbuckley 07-19-2009 05:09 PM

The GPS isn't on unless an application opens a connection to it. Once all connections are closed the GPS is turned off. In some modes that applications can select, the GPS is powered down between fixes.

On GSM units Google Maps goes into cell tower location mode when in the background (unless IIRC specifically configured to keep the GPS on for Latitude). CDMA units may be different.

The GPS does use a lot of battery power, as does the increased traffic to download maps or other data on demand. Google maps is fairly good at limiting this if it is in the background, Blackberry maps is low impact because it uses vector map data which requires less data.

kurichan 07-19-2009 05:29 PM

Well, that's probably the most authoritative reply I've seen around here... Thanks for the great info!


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