True Wind Speed And
Direction Calculator
This calculator requires the use of Javascript enabled and capable browsers. This script will determine the difference between vessel heading and true wind direction and true wind speed. Difference between vessel heading and apparent wind direction and apparent wind speed must be provided. Note that if apparent wind speed is supplied in knots, it is necessary to supply the ship speed in knots. Click on Calculate. This is typically a marine application and the defaults are for "near sea level". Units of vessel speed defines an approximate speed relationship; for instance, 2 units of vessel speed is about twice the speed of the vessel.
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