more than half of California’s wireless 911 calls are delivered without caller location information

“Call 911 from your wireless phone when you’re outdoors, and your location will likely be determined with relative accuracy. If you use that same smartphone indoors, however — particularly in a multi-story building — the accuracy of the call location drastically decreases”
“more and more people are ditching landlines”
“network technologies installed during the last few years made the problem worse (than before)”
“more than half of California’s wireless 911 calls are delivered without caller location information”
“accuracy of wireless calls to 911 decreased sharply between 2008 and 2013, particularly in densely populated areas”
“Existing GPS technology can be blocked or impeded by walls and ceilings when you’re indoors and by structures that block lines of sight to satellites when you’re outdoors”
“Modern GPS technology also does not indicate how far above the ground the phone is”

Source: http://www.cio.com/article/2599401/consumer-technology/mobile-phones-need-better-location-tech-for-emergencies.html

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