Question 956Navigation General

The correct answer is B) 20 meters. When using GPS without Selective Availability (SA), which was turned off in 2000, the horizontal accuracy of GPS is typically better than 20 meters. This is because without SA, the intentional degradation of GPS signals by the U.S. government is removed, allowing for more precise positioning. The other options are incorrect because 3 meters is overly optimistic for unaugmented GPS, while 100 and 200 meters are less accurate than the typical 20-meter horizontal accuracy standard without SA.