Tidal Curve

ThereAndBack

ThereAndBack

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2 Apr 2006
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OK - I know I should know this but....

Can anyone tell me where I may download (or beg, steal or borrow) a blank tidal curve chart (if that's its correct name)?

You know the sort of thing: Graph boxes on the left and a pre-drawn sinusoid curve on the right.

Please bear with my nautical illiteracy /forums/images/graemlins/blush.gif.

Alan
 
PBO Almanac (and probably it's horrendously expensive big brother) has tidal curves for all standard ports and also has a section with instructions on how to use them with worked examples. Most people (like me) tend to have an old copy or two lying around, for some reason I've still got 2002 and 2005. Asking at a local sailing club might well turn up a freebie in exchange for a pint!

JB
 
I don't disagree with the other replies but would just add that I have simply plotted a sinusoidal curve based on the one twelfth rule for my home port (Bradwell) on the East Coast. I know that this is just an approximation but so too is the conversion to secondary ports. I have used my Excel based curve to calculate entry and exit limits and have found it correlates well with the tide gauge in the estuary. I simply enter the times and heights for high and low water and can then read off the height for any given time or the time for a required height. There are of course a number of weird curves for particular ports where this would just not work. I do not trust my life to this but find it useful.
Morgan
 
Hi Morgan,

Do you feel generous enough to share the Excel sheet? would be very useful, especially if I can open it on my PPC. My mates boat is on a drying mooring so it would be useful to see what time we need to be back at to use his own mooring.

Thanks, Stefan
 
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