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Science Fiction
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"My feeling is that the chance of our surviving into the twenty-first century as working civilization is less than fifty percent but greater than zero."
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![]() 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.
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:
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Science Fiction
Timeline
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