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Spam, Food of the Seagods
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This all I know.

True-Wind Calculator Formulas
** Apparent-Wind (AW) and Apparent-Wind Degrees off the bow (D) are known. }

Y = 90 - D
a = AW * ( cos Y )
bb = AW * ( sin Y )
b = bb - BS
True-Wind Speed = (( a * a ) + ( b * b )) 1/2
True-Wind Angle = 90-arctangent ( b / a )

Apparent-Wind Calculator Formulas
** True-Wind (TW) and Apparent-Wind Degrees off the bow (D) are known. }

Y = 90 - D
a = TW * ( cos Y )
b = TW * ( sin Y )
bb = b + BS
Apparent-Wind Speed = (( a * a ) + ( bb * bb )) 1/2
Apparent-Wind Angle = 90- arctangent ( bb / a )

True and Apparent Wind Calculator
 
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