[dhs12345]

Interesting. So there isn't a chance that the government might disable it in some fashion? Surprising that there isn't a provision for this. Similar with the Internet — in a time of “emergency” there would be a provision to shut it down. Selectively or completely. Call me a conspiracy nut.

Selective availability still provided reasonable accuracy, too if some kind of weapon were to be used or targeting system were to be used.

[Richard from IL]

My Dad in retirement was restoring covered bridges in NH and Vermont. I was driving with him circa 1992 to the different bridges and he was using a handheld Garmin to map their positions. He cursed SA for its making the positions less accurate. A large percentage of new civilian receivers use all four worldwide GNSS systems (Japan and India have regional systems). If SA was turned on for GPS, they can rely on the other three systems. So yes, SA is useless today.

[Hulka]

Please see Post 16.

Government has the ability to turn it off. Just vary difficult to make that decision.