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Formulae (3)

ROD \approx GS \times 5

On a standard 3° glide path, required descent rate (fpm) is roughly ground speed (kt) times 5.

GR = \dfrac{d}{h} = \dfrac{L}{D}

Horizontal distance traveled per unit of altitude lost equals the lift-to-drag ratio.

GR = \frac{\text{horizontal distance}}{\text{altitude lost}}

Distance traveled forward per unit of height lost.