Which of the following is an example of an RNAV capable device?

A GPS (Global Positioning System) is indeed an example of an RNAV (Area Navigation) capable device. RNAV systems allow aircraft to fly using waypoints or routes that are not necessarily aligned with ground-based navigation aids, thereby providing greater flexibility in routing and airspace utilization. GPS, as a satellite-based navigation system, provides precise position information and supports the navigation requirements necessary for RNAV operations. This accuracy allows pilots to navigate from point to point based on a predetermined flight path, enhancing both safety and efficiency in modern aviation.

In contrast, a Morse code receiver primarily receives signals from NDBs (Non-Directional Beacons) but does not provide the position-fixing capabilities associated with RNAV. Similarly, a transponder is primarily used for air traffic control purposes, to transmit the aircraft's position to radar systems, but lacks the navigational capabilities inherent to RNAV systems. A speed indicator, while crucial for providing the pilot with information regarding the aircraft's speed, does not function as a navigational aid and therefore is not compatible with RLAV capabilities. Thus, GPS stands out as the clear RNAV-capable device among the options presented.