The apparent wind on-board is often quoted as a speed measured by a masthead transducer containing an anemometer and wind vane that measures wind speed in knots and wind direction in degrees relative to the heading of the boat. Modern instrumentation can calculate the true wind velocity when the apparent wind and boat velocity are input.
Read more about Apparent Wind: Implications On Sailing Speeds, Other Areas of Relevance, Online Calculation and Graphical Impact Presentation
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