What formula is used to calculate VDP?

What formula is used to calculate VDP?

• A. HAT divided by (GS x 100)
• B. GS divided by (HAT x 100)
• C. HAT multiplied by GS
• D. HAT divided by 100GS

Answer: (A)

The concept being tested is how to determine the Visual Descent Point distance from the threshold using height above the threshold and your current ground speed. In this material, the VDP distance is calculated with HAT divided by (GS × 100). Here, HAT is the height above the runway threshold (in feet) and GS is your ground speed (in knots). The factor 100 serves as a unit conversion scaling so the resulting distance comes out in nautical miles. For example, if HAT is 600 ft and GS is 60 knots, the VDP distance is 600 ÷ (60 × 100) = 0.1 NM, meaning you could begin your visual descent about 0.1 nautical miles from the threshold.

The concept being tested is how to determine the Visual Descent Point distance from the threshold using height above the threshold and your current ground speed. In this material, the VDP distance is calculated with HAT divided by (GS × 100). Here, HAT is the height above the runway threshold (in feet) and GS is your ground speed (in knots). The factor 100 serves as a unit conversion scaling so the resulting distance comes out in nautical miles. For example, if HAT is 600 ft and GS is 60 knots, the VDP distance is 600 ÷ (60 × 100) = 0.1 NM, meaning you could begin your visual descent about 0.1 nautical miles from the threshold.