What information do you need to calculate your ground speed?

What information do you need to calculate your ground speed?

• A. True airspeed and wind component
• B. DME traveled in 1 minute multiplied by 60
• C. Ground speed is TAS corrected for temperature
• D. Distance divided by time en route

Answer: (B)

Ground speed is how far you move over the ground in a given time. To find it, you need a distance you’ve covered in a known time interval. Using DME to see how far you’ve traveled in one minute, then multiplying by 60, gives you the distance per hour you’ve moved over the ground, i.e., knots. This directly uses the speed = distance / time idea with a practical distance measurement from DME. TAS with wind can give a ground speed, but it requires wind data and more steps; ground speed isn’t simply TAS corrected for temperature. Distance divided by time is the general formula, but the DME method provides a concrete, in‑the‑ cockpit way to obtain that distance over a specific minute.

Ground speed is how far you move over the ground in a given time. To find it, you need a distance you’ve covered in a known time interval. Using DME to see how far you’ve traveled in one minute, then multiplying by 60, gives you the distance per hour you’ve moved over the ground, i.e., knots. This directly uses the speed = distance / time idea with a practical distance measurement from DME.

TAS with wind can give a ground speed, but it requires wind data and more steps; ground speed isn’t simply TAS corrected for temperature. Distance divided by time is the general formula, but the DME method provides a concrete, in‑the‑ cockpit way to obtain that distance over a specific minute.