Way back I remember a rule in regard to how tidal current flows. It went something like this rule of 12 1-12 2-12 3-12 3-12 2-12 1-12 meaning at the start of flow 1-12 of current flows the 2-12 flows ect. I was trying to explain this to a friend but could not exactly remember how it worked. I have looked in my old piloting books and all over and cannot find any information on the subject. If anyone can help me , This would be one less thing that I have to write off to early onset alztimers. Not really but the way my memory works now days it is real scarey. Thanks okbye JP