When taking true course measurements on a Section Aeronautical Chart, where should measurements ideally be made?

When measuring true courses on a Section Aeronautical Chart, the ideal location for making these measurements is at a meridian near the midpoint of the course. This approach is advantageous because the curvature of the Earth and differences in latitude can distort measurements if taken too close to the origin or the destination of the route. By measuring at the midpoint, the effects of these distortions are minimized, leading to a more accurate representation of the true course.

Choosing a meridian at this point helps ensure that you are accounting for the Earth’s curvature more effectively, providing a clearer path along the intended course and reducing the potential for navigational errors. Accurate true course measurements are critical for successful flight planning and navigation, reinforcing why this option is the best choice.