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"We are all repositories for genetically-encoded information that we're all spreading back and forth amongst each other, all the time. We're just lousy with information."
- Neal Stephenson

GPS Sunglasses  
  Sunglasses that contain both global positioning system components and cell phone services.  

Okay, so your sunglasses ring, you open them up and put them on. You see, projected on the lens of your sunglasses, whatever the other person is seeing (and presumably vice-versa). Not only that, the other person knows exactly where you are thanks to the GPS device built in to the sunglasses.

…She slipped him a pair of Brazilian GPS sunglasses, with inbuilt phone and AM-FM radio.
From All Tomorrow's Parties, by William Gibson.
Published by Putnam in 1999
Additional resources -

Do you need these? Maybe not. But the people in William Gibson's endlessly inventive novels, this is the sort of urban nomadic stuff you need. And, if you're a true urban nomad, knowing where you are with GPS is perfect.

You're an engineer and you want to know it works? By all means, read this dense PDF - GPS Signal Availability in an Urban Area Receiver Performance Analysis.

In a hurry and you'd prefer to cut to the chase? Okay, it turns out that in urban environments subject to lots of signal shading, GPS signal availability can vary by 60%. You want details: try this:

"The results demonstrate the effectiveness of narrow correlator spacing technology in reducing the position errors caused by multipath from buildings in urban canyons."

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Additional resources:
  More Ideas and Technology from All Tomorrow's Parties
  More Ideas and Technology by William Gibson
  Tech news articles related to All Tomorrow's Parties
  Tech news articles related to works by William Gibson

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