Which components make up the RMI?

The correct answer is based on the specific components that constitute the Radio Magnetic Indicator (RMI), which is an essential navigational aid used in aviation. The RMI includes a rotating compass card that provides the pilot with a visual representation of the aircraft's heading relative to magnetic north. Additionally, it features a double-barreled bearing indicator, which allows the pilot to simultaneously track two different navigational references. The indicator typically has one needle pointing to the selected VOR or NDB station and another needle that can be set to a different reference. The single-barreled bearing indicator is used similarly but may indicate only one reference point at a time.

Understanding these components helps pilots effectively utilize the RMI for navigation, enhancing situational awareness and decision-making in flight. The other options reference instruments that do not align with the specific functions and parts of the RMI, making them unrelated to this particular piece of navigation equipment.