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The irony of course is that the guv'mint can "degrade" the signal in steps to the point where it is useless unless you have the crypto on hand to remove the timing errors. Because this system is of military origin the criteria for this is (probably is subjective at best) classified. I have used the military GPS receivers and they occupy 8RU to house the necessary digital "reconstructors" to re-enable the full signal. I wonder if the FCC would fine the military...
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