Re: Navigation for the blind (algorithm of redirection)
@3
Unless you have a very good source, consumer vs military gps is a myth and you're making an inaccurate claim. it is actually possible to get consumer-grade GPS accurate to roughly an inch (I can probably find that paper again) but it takes too much computing power and specialized hardware to be feasible for phones. We use the same satellites and stuff now, as far as I know, and have since the early 2000s.
The real problem is that the atmosphere is in the way. You get changes in the ionosphere, a cloud, different air pressure, different humidity, etc. and this changes the characteristics of the signal. But that's for a thing where the entire point is you're estimating distances based off the signal whose characteristics just got changed, so doesn't end super well.
There's also issues with being near the poles. Pretty sure that most/all of the gps satellites are near the equator as well because we want geosynchronous orbits, but has been a while since I looked into that aspect.
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