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Wirelessly posted (Sprint Touch Pro 2: Opera/9.80 (J2ME/MIDP; Opera Mini/5.0.16823/1226; U; en) Presto/2.2.0)
after you quit google maps, it asks you whether u'd like it to continue updating ur location to ur latitude friends. i think it uses cell tower triangulation after its shut off to save battery. Now how well and frequently it updates is something i have yet to figure out. My friends are able to see where i am even though i havent opened google maps after changing location. My gf's latitude location is usually continually updated and i know for a fact that she has not opened google maps after the first time i tried to show her how useful it can be and showed her latitude. she is on a blackberry storm though. regardless, the whole point of latitude IS behind the scenes location updates
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