What do radio navigation systems display to aid in navigation?

Radio navigation systems are designed to provide critical information that assists pilots in safely navigating their aircraft. The primary functions of these systems include determining the aircraft's position and guiding it along a desired flight path.

The correct answer highlights that these systems display direction and range, which are fundamental aspects of navigation. Direction refers to the heading or bearing towards a specific waypoint or destination, while range indicates the distance to that target. These two pieces of information allow pilots to understand not only where they are headed but also how far they need to travel to reach their destination, making it easier to plan course corrections and ensure they stay on track.

In contrast, altitude readings, flight speeds, and wind direction are important for flight safety and performance, but they do not directly relate to the core function of navigating from one point to another. While these factors are influenced by and can impact navigation, they are not the primary data that radio navigation systems focus on. Therefore, the emphasis on direction and range positions them as the most relevant outputs for navigation purposes within the context of radio navigation systems.