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The accuracy commitments do not apply to GPS devices, but rather to the signals transmitted in space. For example, the government commits to broadcasting the GPS signal in space with a global average user range error (URE) of 7.8 m (25.6 ft.), with 95% probability. Actual performance exceeds the specification. On May 11, 2016, the global average URE was 0.715 m (2.3 ft.), 95% of the time. GPS Accuracy

User accuracy depends on many factors in addition to range accuracy, so the result is GPS Accuracy Levels it is possible now to get very accurate positions now, with differential GPS.

The really big change is that less expensive hardware is now able to handle the more complex math, and it is getting to market. Global Positioning System: The Mathematics of GPS Receivers

http://faculty.nps.edu/ncrowe/cyberperfidy.htm

Nevertheless, I am still correct. The 4th sat is only for precision.

No it's not.

It is not necessary for location.

Yes it is.

Quoting the Navy: "Therefore there are 4 unknowns at each timeline where a solution is computed, 3 for position and 1 for time. This is why the minimum number of satellites for a solution is 4."

LOOK AT THE SOURCE. A total fruitcake with NO credibility in the field in which he is spouting off in.

I did. He's talking about rare earths, which while it has some nuance, isn't that complicated a subject. That doesn't require extensive credentials to talk about. Even if it did, "spook" (or more accurately here, one who gathers intelligence from mostly open sources) is one of the careers in which I'd expect to find knowledgeable people about this subject and people willing to invest the time to make a report.

As it turns out, Looney has a PhD from UC Davis in economics and he is a professor in a relevant discipline. So he has sufficient credentials as well for those who think they should matter so much.

Realistically, its the remotest of possibilities that the Taliban could attack one of these aircraft unless their Iranian friends wanted them to.

Even the ancient Sa-5 Gammon missiles that Iran has in quantity are capable of reaching that altitude, and portable enough to transport across a porous border.

Highly unlikely I admit, but then 5 years with one of these aircraft peeking over their borders 24/7 might just goad Iran into such a "loan".

There is some Slant Range Radar imagery from 86km away taken from Global Hawk on page 50 of this document. The actual maximum range of the full sensor package is still classified, but that image of Lake Success Dam had more than enough resolution to show major troop movements.

Just curious... ...where does one obtain a Masters degree in Electronic Warfare?

He obtained his from the Naval Postgraduate School

SimKit, Discrete Event Simulation Library, also from the Naval Postgraduate School....

http://diana.nps.edu/Simkit/

Sean

http://cisr.nps.edu/cyberciege/ is a video game designed to teach computer security concepts. In addition to its more advanced scenarios, it includes a few simple "awareness" scenarios, the first of which directly addresses your topic. Further, this animated movie: http://cisr.nps.edu/cyberciege/movies/02CIEGE.html helps the layman understand why the problem of malicious software is so hard to solve. The link includes a free evaluation version of the game.

http://cisr.nps.edu/cyberciege/ is a video game designed to teach computer security concepts. In addition to its more advanced scenarios, it includes a few simple "awareness" scenarios, the first of which directly addresses your topic. Further, this animated movie: http://cisr.nps.edu/cyberciege/movies/02CIEGE.html helps the layman understand why the problem of malicious software is so hard to solve. The link includes a free evaluation version of the game.

There is no "Naval Postgraduate Academy," it's the "Naval Postgraduate School". If the authors of the article couldn't be bothered to take 15 seconds to confirm that with Google, it makes me wonder what else is incorrect in their writeup.