Cardinal Marks : how to avoid underwater dangers with your boat 

Cardinals are there to tell you on what side you have to pass to avoid a danger under the water.
This video is a quick refresher with some tips on how to remember them and the practical use.
Remember pass the North cardinal on the North side, East by the East side, South by the South side and the West by the West side and use your compass to guide you.
Enjoy the video.