- angle = ((15.0 - course.bearing) * 0.5235988)
- deltax = -math.sin(angle)
- deltay = math.cos(angle)
- if math.fabs(deltax) > math.fabs(deltay):
- bigger = math.fabs(deltax)
- else:
- bigger = math.fabs(deltay)
- deltay /= bigger
- deltax /= bigger