What is the calculation used to determine the VDP in nautical miles from threshold?

The calculation to determine the Visual Descent Point (VDP) in nautical miles from the threshold uses a straightforward formula involving the Height Above Threshold (HAT). Specifically, dividing the HAT by 300 provides the correct distance from the threshold in nautical miles. This formula stems from the general rule that, for every 300 feet of descent, an aircraft travels approximately 1 nautical mile. Thus, by applying this simple division, pilots can effectively gauge how far from the runway they should start their final descent, ensuring a safe and manageable approach to landing.

In the context of the other options, multiplying HAT, adding a constant, or subtracting a constant from HAT would not accurately reflect the relationship between altitude and distance during the descent phase in aviation operations. These alternative calculations do not consider the established correlation necessary for precise navigation and landing procedures.