Quick Facts
- Type
- Speed Reference
- Definition
- The actual speed of an aircraft relative to the ground
- Used By
- Pilots, ATC
Definition#
Ground speed (GS) is the speed of an aircraft relative to the earth's surface. It equals true airspeed adjusted for the headwind or tailwind component.
Why It Matters Operationally#
Ground speed determines actual time en route, fuel burn, and ETA. A strong headwind can dramatically increase fuel consumption and flight time, even at constant TAS.
Related Guides#
- How Airplanes Fly — The Complete Aviation Fundamentals Guide
- How Jet Engines Work (Turbofan vs Turboprop)
- Crosswind Explained