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This is Scientific American's 60-Second Tech. I'm Larry Greenemeier. Got a minute?

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Touch your smartphone screen and you local weather or a street map.

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So you might assume that mobile phones know exactly where you are.

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But get into trouble and you might find your phone isn't watching you as closely as you thought.

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Emergency responders recently told the Wall Street Journal that their 911 dispatchers have trouble getting help to the location of cell phone callers.

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And a report this summer showed more than half of all California wireless 911 calls in certain areas didn't have location information.

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One way to locate a cell phone is through GPS, assuming the phone has one and it's outdoors.

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Another is through location-based services.

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These follow the signals sent between your phone and your wireless network's radio towers.

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But towers can be miles apart, making it hard to pinpoint locations and adding minutes to response times.

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Responders want wireless companies to include location data with each call, something privacy advocates oppose.

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It's a matter of perspective.

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Sometimes you want to be off the grid.

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But in a crisis, the grid could be your best friend.

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Thanks for the minute, for Scientific American 60-Second Tech. I'm Larry Greenemeier.

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