docs: public void calc()
      {
          double x = Math.cos(relativeAngle)*relativeSpeed - Math.cos(driftAngle)*boatSpeed;
          double y = Math.sin(relativeAngle)*relativeSpeed - Math.sin(driftAngle)*boatSpeed;
          trueSpeed = Math.hypot(x, y);
          trueAngle = Math.toDegrees(Math.atan2(y, x));
          if (trueAngle < 0)
          {
              trueAngle += 360.0;
          }
      }