What is the function of a heading indicator?

The heading indicator, also known as a directional gyro, serves an essential function in aviation by displaying the aircraft's current direction or heading relative to magnetic north. This instrument is crucial for navigation, as it allows pilots to maintain a desired course and make precise adjustments during flight. The heading indicator operates independently of the aircraft's movement and is not influenced by wind or other external factors, providing a reliable reference for the pilot.

In practical use, the heading indicator helps pilots execute maneuvers such as turns and maintains situational awareness regarding the aircraft's orientation. This contributes to achieving smooth navigation and aids in flying accurately to waypoints or during approaches and departures from airports.

The other options, which pertain to measuring speed, providing altitude information, or indicating fuel consumption, do not describe the function of the heading indicator. Each of these functions is served by different instruments within the aircraft's cockpit, thus highlighting the specific role and importance of the heading indicator in navigation.