During a standard RNAV (GPS) approach, how accurate must the navigation system be in the final approach segment?

In the context of a standard RNAV (GPS) approach, the navigation system is required to maintain a high level of accuracy during the final approach segment to ensure safe and precise navigation for the aircraft. The correct level of accuracy for the navigation system is within 0.3 nautical miles of the desired track, 95 percent of the time. This standard is set to ensure that pilots can safely navigate their aircraft during the critical phase of approach and landing while minimizing the risk of deviation from the intended flight path.

Achieving this level of accuracy is essential because any significant deviation could affect the aircraft's ability to align correctly with the runway, complicate the landing process, or even lead to unsafe situations in low visibility conditions. Thus, the requirement for maintaining this accuracy level reflects the FAA's commitment to safety during the final approach of RNAV (GPS) approaches.

Other options reflect different accuracy thresholds that either do not meet regulatory standards or are not required during this phase, highlighting the necessity of the specified accuracy during a critical operation like the final approach.