1.The inshore tidal stream sets opposite with the offshore which sets W 1hr before HW and E 5hrs after HW.2.Numerous marine farms exist in offshore areas within this chart.Mariners should navigate with caution.3.Besides the charted prohibited area,traders are also prohibited to navigate or anchor between Hei Dao and the East Pier of Weihai Gang as well as wihin 500m off Liugong Dao.