Nov 222014
 
 November 22, 2014  Surveillance

Craig Timberg reports:

Cellphones long have doubled as tracking devices, capable of revealing your location to police, paramedics, even grocery stores looking to deliver coupons to nearby customers. But there’s a measurement cellphones once struggled to make: altitude.

No more.

Read more on Washington Post.

Thanks to Joe Cadillic for this link.

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