What should pilots do during an RNAV approach without WAAS capabilities?

During an RNAV approach without WAAS (Wide Area Augmentation System) capabilities, pilots should anticipate potential deviations in course. RNAV approaches rely heavily on accurate electronic navigation and GPS data. In the absence of WAAS, which enhances the accuracy and integrity of GPS signals, pilots should remain vigilant because the navigation performance may not be as precise. Recognizing this limitation, pilots are advised to be prepared for variances from the intended flight path, thus allowing for timely corrections and adjustments as necessary to maintain safe navigation and approach.

The focus on expecting possible deviations emphasizes the importance of maintaining situational awareness and readiness to respond to changes in navigation performance. This awareness can be crucial in ensuring a safe approach and successful landing in conditions where the standard of accuracy may not be fully met.