In the global positioning system
), Selective Availability refers to the decreased accuracy of the civilian band GPS. Selective Availability can be set to vary between 10 and 200 meters
, although it has normally been set at about 50 meters.
Comparison of Accuracy with and without Selective Availabilty
Collection 95% 95%
Hours with SA without SA
24 45.0 m 6.3 m
12 60.7 m 7.9 m
6.5 48.3 m 4.5 m
Data collected by NOAA in spring 2000.
On May 1, 2000, SA was removed from GPS by Executive Order.