Another element of the GPS story is the profound impact of the US flipping a veritable switch and turning off Selective Availability in 2000 (https://www.gps.go

Another element of the GPS story is the profound impact of the US flipping a veritable switch and turning off Selective Availability in 2000 (https://www.gps.gov/systems/gps/modernization/sa/ https://www.gps.gov/systems/gps/modernization/sa/), taking accuracy from perhaps 50m to a couple of meters.