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Now that skippers have access to arithmetical division machines and numerical proportion calculation have been made cheap, it is strange that calculation is taught to be performed graphically, by inflecting lines at the intersection with diagonal. Surely this technique was employed to teach barely literate captains of XIX century. But why this approach is preserved today, when everyone is free to re-scale their bell curve to particular tide heights using computational technique that is available to them.

Wicked. Useful way of knowing if it's Springs or Leaps cheers

Your explanation was simple and clear, I finally understood. Thanks for sharing !

Perfect and EXACTLY what I needed. Thank you!

Thanks for this it’s been very helpful !

How would you layout the high water and low water heights ? Thanks for the video !

You have simplified something I consider so difficult and concerning to me going forward to attempt my yacht master. I've been working on the Solent all my life and now at the point where I'd like to do my Master 200. To obtain this I need my yacht master but always shit myself because I don't know how to do secondary tide calculation like this. Next step is applying it to the curve. Thanks very much for this video. I really appreciate it !