What are the three vectors in the triangle of velocities?

The three vectors in the triangle of velocities—heading/true airspeed, track/ground speed, and wind—are essential for understanding how an aircraft is influenced by both its motion and environmental factors.

The heading and true airspeed vector represent the aircraft's intended path through the air and its speed through that medium, while the track and ground speed vector show the actual path and speed over the ground. The wind vector illustrates the direction and speed of the wind that affects the aircraft's flight path.

By combining these vectors, pilots can accurately determine the aircraft's actual track over the ground when the wind is factored in. This triangle of velocities is critical for navigation, as it helps in calculating corrections needed to maintain the desired flight path amidst varying wind conditions and to ensure the aircraft arrives at its intended destination.

While other options mention various aspects of flight and navigation, they do not accurately capture the standard terminology and relevance of the three vectors that provide a comprehensive understanding of the aircraft's dynamics in flight.