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indicates the aircraft's speed relative to the air mass. The air mass may be moving over the ground due to wind, and therefore some additional means to provide position over the ground is required. This might be through navigation using landmarks, radio aided position location,
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An aircraft diving vertically would have a ground speed of zero. Information displayed to passengers through the entertainment system of airline aircraft usually gives the aircraft ground speed rather than
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relative to the Earth’s surface. It is vital for accurate navigation that the pilot has an estimate of the ground speed that will be achieved during each leg of a flight.
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adds to it. Winds at other angles to the heading will have components of either headwind or tailwind as well as a
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flight computer may be used to calculate ground speed.
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Horizontal speed of an aircraft relative to the ground
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228:"Relative Velocity - Ground Reference"
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214:References
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263:Velocity
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