> We used it somewhat famously during the 9/11 attacks.
I have not been able to locate any source that backs up this claim.
I have not been able to locate any source that backs up this claim.
Perhaps the commenter is thinking of the fact it was used globally prior to May 1, 2000. From a civilian point of view, GPS appeared to be invented around this time but it had actually been available for a couple of decades already, just in a degraded form that wasn't very useful.
Differential GPS was already in widespread use in many counties by 2000, which made "selective ability" pointless at it provided automatic corrections to the 'degraded' GPS signal.