public class E6B
{
   private double d; //desired course in dr
   private double va; //speed in knots
   private double w; //wind direction in degrees
   private double vw; //wind speed in knots

   public E6B( double pd, double pva, double pw, double pvw)
   {
      d = pd;
      va = pva;
      w = pw;
      vw = pvw;
   }

   //accsessor
   public double getD(){ return d; }
   public double getVa(){ return va; }
   public double getW(){ return w; }
   public double getVw(){ return vw; }

   public double windCorrectionAngle()
   {
     double dr = Math.toRadians( d );
     double wr = Math.toRadians( w );
     double rv = 0;

     rv = Math.asin(vw * Math.sin(wr - dr) / va);

     return Math.toDegrees( rv );
   }

   public double groundSpeed()
   {
      double dr = Math.toRadians( d );
      double wr = Math.toRadians( w );
      double gsv = 0;

      gsv = Math.sqrt( va + vw - 2*va  * Math.cos (d - w + -5 ) );
      return Math.toDegrees( gsv );
   }

   public double windCorrectionAngleDegrees()
   {
      double dr = Math.toRadians( d );
      double wr = Math.toRadians( w );
      double wcad = 0;

      wcad = 180 / 3.14 * Math.sin(vw / va * Math.sin( 3.14 * ( w - d )/ 180));
      return Math.toDegrees( wcad );
   }

   public double trueGroundSpeed()
   {
      double dr = Math.toRadians( d );
      double wr = Math.toRadians( w );
      double tgs = 0;

      tgs = Math.sqrt( va + vw - 2 * va * vw * Math.cos( 3.14 * ( d - w + -5 ) / 180 ));
      return Math.toDegrees( tgs );
   }

   public static void main (String[]args)
   {
      E6B e6b = new E6B( 360, 120, 270, 10 );

      System.out.println( " Wind Correction Angle: " + Math.round( e6b.windCorrectionAngle() ) );
      System.out.println( " Ground Speed: " + Math.round( e6b.groundSpeed() ) );
      System.out.println( " Wind Correction Angle in Degrees: " + Math.round( e6b.windCorrectionAngleDegrees() ) );
      System.out.println( " True Ground Speed: " + Math.round( e6b.trueGroundSpeed() ) );
   }
}