What is the GPS accuracy during final approach?

On final approach, the accuracy of GPS is critical for safe and precise navigation. The correct choice of 0.3 nautical miles aligns with the established standards for GPS accuracy during this phase of flight.

When flying on a final approach, the requirement for navigation precision increases significantly, as pilots are closely managing their altitude, positioning, and course relative to the runway. GPS systems are designed to provide position data within this accuracy range to ensure that aircraft can approach and land safely, particularly when using GPS approaches like WAAS (Wide Area Augmentation System), which enhances the accuracy and reliability of GPS signals.

Other options reflect less precise navigation capabilities, which would not meet the safety requirements necessary during the critical phase of landing. Thus, the option of 0.3 nautical miles is considered the most accurate and practical answer for GPS performance on final approach, providing the required level of precision for safe aircraft operations in this phase.