When GPS operations began, signals for non-military users contained intentional errors in timing reference so only military devices could obtain the most accurate positions. This aspect of GPS operations, called "Selective Availability," was permanently removed in 2000.
Media Asset:
Credit (appears under image in pop-up window):
U. S. National Park Service, Department of the Interior
Short Caption (caption underneath the image in pop-up window):
Intentional errors in time and position signals, known as "Selective Availability," were removed for non-military GPS users.
Topics:
Start Date (appears when user rolls over the image):
2000
Date Range:
Timeline Key:
Learn More (links to an internal site page):
/satellite-navigation/who-uses-satellite-navigation/civilian-applications/improving-accuracy
