Aviation English
Flight Phase

What is Ground speed?

Ground speed The speed of an aircraft relative to the surface of the Earth, as measured by navigation systems.

Source: ICAO Doc 9432, FAA PCG

How is “Ground speed” Used in Practice?

ATC advised the flight crew that their ground speed had decreased due to strong headwinds.

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

Related Aviation English Terms

True airspeedTop of climbStep climbMach number

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Frequently Asked Questions

What is Ground speed?

The speed of an aircraft relative to the surface of the Earth, as measured by navigation systems.

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