What does NextGen Air Traffic Control transition from?

The transition to NextGen Air Traffic Control primarily involves moving from land-based navigation systems to satellite-based navigation systems. This shift allows for a more efficient, precise, and flexible approach to air traffic management. Satellite-based navigation, which includes technologies like GPS, enhances situational awareness, improves route optimization, and reduces the environmental impact of flying by allowing aircraft to follow more direct flight paths.

The advantages of satellite-based navigation in the NextGen system include improved safety and the ability to manage greater traffic volumes with reduced separation distances. As a result, NextGen aims to create a more dynamic airspace that can adapt to the growing demands of aviation, enhancing overall efficiency and operational performance.

In contrast, the other choices pertain to navigation or control systems that do not align with the core advancements that NextGen represents. Thus, they do not reflect the primary focus and objective of transitioning to NextGen Air Traffic Control.