What changes in GPS approach mode regarding the sensitivity on the CDI?

In GPS approach mode, the sensitivity of the Course Deviation Indicator (CDI) reflects how the system approaches the guidance for the pilot as the aircraft nears the airport or waypoint. When transitioning to GPS approach mode, the CDI sensitivity changes from a broader range to a more precise range, allowing for finer resolution in guidance.

Specifically, the sensitivity shifts from 1 nautical mile (NM) to 0.3 NM. This change allows pilots to receive more accurate and responsive guidance during final approach, which is crucial for safely aligning the aircraft with the runway. The tighter sensitivity helps pilots make necessary corrections with greater precision as they get closer to the intended landing point, thus enhancing safety and improving the ability to follow the designed approach path.

Understanding this adjustment is vital for pilots using GPS during approach phases, as it directly impacts their navigation and situational awareness.