What should a pilot do immediately after losing GPS signal during an RNAV approach?

When a pilot loses GPS signal during an RNAV (Area Navigation) approach, it is crucial to prioritize safety and adhere to established procedures. The most appropriate action in this scenario is to fly the missed approach procedure. This procedure is designed to safely transition the aircraft away from the approach path when navigation aids are compromised.

The missed approach procedure provides specific guidance on how to climb to a safe altitude, what routes to follow, and the holding pattern to enter if necessary. By executing this procedure, the pilot ensures that they are not navigating blind, which could lead to potential hazards such as terrain or obstacles.

Maintaining height until GPS signal is regained could put the aircraft at risk if the altitude is inappropriate for terrain or obstacles. Continuing to the next waypoint without precise navigation could result in an unintended path off the approach, and attempting a visual approach without adequate reference could lead to loss of control or an accident. Thus, following the missed approach procedure prioritizes safety and compliance with regulations.