What is the purpose of reference ground speed in landing procedures?

Reference ground speed is essential in landing procedures because it provides pilots with a comparative measure of the aircraft's speed relative to the ground. This reference helps in assessing the impact of wind conditions during approach and landing. Knowing the reference ground speed allows pilots to recognize significant changes in their flight conditions, particularly when windshear is present, which can dramatically affect the aircraft's performance during landing.

Information about expected ground speeds aids in decision-making, enabling pilots to adjust their approach as needed to ensure a safe landing. This is particularly critical in varying wind conditions, where discrepancies between airspeed and groundspeed can indicate turbulence or disturbances that need to be managed. Proper use of reference ground speed contributes to situational awareness and enhances overall safety during landing procedures.