you could try http://www.wxtide32.com

not an online resource, but you can download the program for free, and
it will do what you want for anywhere, let alone Cornwall.

Hope this helps

Steve Mason

The latest versions of WXTide do not contain UK data (apart from a few
limited ports). They were forced to remove it at the request of the UK
Hydrographic Office.

Ian Sutherland


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