What did Selective Availability (now turned off) do to the accuracy of GPS?
| Back To Top Selective Availability (SA) is the term that the government called the technique of denying civilians the full accuracy of GPS. They turned it off on May 2, 2000, but warned that, in the case of war, they might turn it back on. While the government now seems serious about keeping SA off, remember that DGPS and WAAS will still be better than GPS without SA. Expect about 75 ft of accuracy for Loran C and GPS waypoints accurately converted from loran, 60 ft. accuracy for ordinary GPS, and 15 ft. for DGPS or WAAS. If you collected waypoints using ordinary GPS prior to May 2, 2000, they might be very innacurate.
