What happens when overriding an automatically selected sensitivity while flying a GPS approach procedure?

When overriding an automatically selected sensitivity during a GPS approach procedure, the action effectively cancels the approach mode annunciation. This is because the sensitivity settings are designed to optimize the guidance and tracking accuracy for the specific phase of the approach. By overriding these settings, the aircraft's system no longer operates within the parameters that indicate it is in approach mode. As a result, the approach mode annunciation is lost, which can lead to a reduced level of precision in guidance and may complicate the approach process for the pilot.

In this context, understanding the implications of changing the sensitivity is crucial. The approach mode is specifically calibrated to ensure that the aircraft adheres to the required trajectory and maintains proper lateral and vertical guidance. Disabling or overriding these automatic settings can therefore cause the system to revert to a less precise navigation mode, which is not suitable for the critical phases of an approach.