What is the best practice to ensure TAS is used in the Ground Speed calculation?

What is the best practice to ensure TAS is used in the Ground Speed calculation?

• A. Have IAS set for TAS
• B. Use Mach for TAS
• C. Use pitch for TAS
• D. Use power for TAS

Answer: (A)

Ground speed depends on true airspeed (TAS) combined with wind. Since TAS reflects how fast you’re moving through the air mass, and IAS is what your instrument shows, converting IAS to TAS using current altitude and air density is essential for an accurate ground-speed calculation. The best practice is to ensure IAS is available and correctly fed into the TAS conversion so the system uses the true airspeed in the wind-corrected calculation. Mach, pitch, or power don’t directly provide the TAS needed for this calculation: Mach is a speed relative to the speed of sound (not a general TAS input), pitch is a control input that doesn’t give TAS by itself, and power affects speed only indirectly.