How do you calculate VDP?

The correct choice for calculating the Visual Descent Point (VDP) involves the relationship between the Height Above Touchdown (HAT) and the Ground Speed (GS). To determine the VDP, the formula used is VDP = HAT / GS.

In this calculation, Height Above Touchdown (HAT) refers to the vertical distance from the aircraft to the runway threshold at the time of descent. Ground Speed (GS) is the speed at which the aircraft is traveling over the ground. By dividing HAT by GS, you can effectively determine how far the aircraft will travel horizontally during the descent to reach the touchdown point. This calculation is crucial in instrument flight rules (IFR) operations, as it provides pilots with critical information for safe and accurate landings.

Understanding this formula and its application is important for pilots as it helps manage descent rates and navigate towards the runway safely while ensuring compliance with visual approach requirements.