What is the primary function of the directional gyro in aviation?

The primary function of the directional gyro is to provide accurate heading information. In aviation, knowing the aircraft's heading is crucial for navigation and maintaining the intended flight path. The directional gyro, typically part of the aircraft's instruments, helps pilots determine their current directional orientation relative to magnetic north, which is essential for effective navigation.

This instrument operates based on gyroscopic principles, helping to stabilize the aircraft's heading information and reduce the effects of external factors like turbulence, which can cause fluctuations in a magnetic compass. By relying on the directional gyro, pilots can maintain a steady heading, especially in conditions where visual reference may be limited.

Other options relate to different functions associated with flight operations. For instance, maintaining altitude is typically managed by the altimeter and other systems, while airspeed is primarily monitored with the airspeed indicator. Navigation on the ground involves a different set of instruments and strategies that are not directly associated with the primary purpose of the directional gyro.