My toy only got 1 main sail and therefore, it has some limitations as you said "逆風".
But don't worry! If the wind is from the north (0 / 360 degree), about 325 degree to 35 degree is motionless. In such situation, I need to avoid from riding within 325-35 degree = 70 degree. Then, I have to sail in Z.. Z.. because I can't sail directly to north.