What is a line drawn from one point to another on a chart called?

A line drawn from one point to another on a chart is termed "the course." This term refers specifically to the intended path of travel over the ground, which is represented on charts to help pilots and navigators understand their planned direction. The course is critical for navigation as it informs the pilot of the intended path to their destination and aids in situational awareness during flight.

In aviation, the course may involve considering magnetic variation and wind conditions, but fundamentally, it serves as a guiding reference on a chart. Pilots often use this designated line to align their flight path and make necessary adjustments based on real-time conditions.

The other terms provided refer to different aspects of navigation. The heading indicates the aircraft's orientation relative to North, the route encompasses the overall path and may include multiple courses or waypoints, and the vector typically relates to a direction and speed in physics, which is less applicable in this context. Understanding the distinction among these terms helps clarify their usage in aviation navigation.