What is the purpose of noting the CDI needle's rate of closure during a GPS intercept?

Noting the CDI (Course Deviation Indicator) needle's rate of closure during a GPS intercept is crucial for ensuring a smooth turn to the desired course. By monitoring how quickly the CDI needle is moving toward the center, pilots can gauge whether their aircraft is aligning properly with the intended track. If the needle is closing quickly, it may indicate that a more aggressive turn is needed to stay on course; meanwhile, a slower closure rate might mean that a gradual turn is appropriate to avoid overshooting the course. This skill helps maintain precision during navigation, particularly in instrument flight conditions where visual references are limited.

Understanding this aspect of navigation is essential for effective flying, particularly in complex environments where quick adjustments may be necessary to ensure safety and accuracy in reaching a designated waypoint or course.