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Ground Wind
Ground wind is the speed and dlirection of the wind referenced to land.
Ground wind is often used by sailors in a strong tidal Current when trying to anticipate what the wind will be like when the Tide changes.
Weather forecasts provide Ground Wind. If sailing in tidal areas the navigator should be aware of the additional "Tide Wind" effect and compensate for it in their decision making. For example, if the forecast is for 18 knots of wind, 2 knots of Tide could be the difference between 16 and 20 knots of True Wind.
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