Yeager Aerospace Test 2025 – 400 Free Practice Questions to Pass the Exam

The Standard Positioning System (SPS) is the correct answer because it is designed to provide a certain level of accuracy for navigation purposes. The accuracy of SPS is controlled by a program known as Selective Assignment (SA), which was historically used to provide degraded accuracy to civilian users of GPS signals for national security purposes. This was done to ensure that military users, who had access to more accurate signals, could navigate with higher precision.

Selective Assignment was implemented to restrict civilian access to the most precise GPS data, thus providing a form of control over the level of accuracy available to non-military applications. It established a differentiation in the accuracy levels between military and civilian users, allowing the military to retain a strategic advantage in terms of navigational accuracy.

Other systems listed, like the Global Positioning System and the Instrument Landing System, provide positioning and navigation capabilities but do not specifically rely on Selective Assignment for accuracy control. LORAN, while also a navigation system, operates based on a different method of triangulation and was not associated with Selective Assignment.