Casio tidal watches

[MUS]

Does any one know where I can find the 'lunitidal interval' for Falmouth to plug into my new Casio watch?

The Casio manual describes 'lunitidal interval' as the time difference between the moon passing over the meridian and high tide. This doesn't mean much to me, but I presume it roughly equates to a constant time difference.

<hr width=100% size=1>http://groups.msn.com/Limboyachts

 

[Roberto]

One method is described here

http://www.akueck.de/tiden_faq.htm#f01e

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[AndrewB]

A Google search will give you plenty of sites explaining how to work this out.

It isn't heard of much in England because the lunitidal interval is notoriously variable around our coast. At Dover for example this method could be an hour or even more out in predicting high water. It would be desirable to do the calculation over a period of 30 days, and chose the average. I've a hunch that it is better in Falmouth than further east, and that the time between consecutive low waters tends to be more stable than the time between high waters, so you'd get better accuracy for low water.

 

[peterb]

According to Chart 5058 (which gives the co-tidal and co-range curves for all UK waters) the luni-tidal interval for Falmouth is about 4hrs 35min.

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[MUS]

Thanks, everyone. I'll have a bit of fun seeing how accurate it is this year.

I certainly won't rely on it, but it might be useful for giving me a rough idea of when I've got to leave the pub!

<hr width=100% size=1>http://groups.msn.com/Limboyachts

 

[JerryHawkins]

I got one of these watches for Xmas 2001 and sucessfully used it throughout 2002. I spent some time setting the interval by trial and error and comparing when it said high/low tide was against published tide tables (for Plymouth). I ended up setting the interval to 6:30. Given that it only shows 2 hour chunks, when the watch shows high or low tide - it is (+ or - 2 hours).

I haven't done another trial and error run for this year yet, so I may need some minor adjustments!

Cheers,

Jerry

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[MoonDust]

Does anyone know the official interval for Portsmouth? I've been working on 11 hours, which I worked out on the back of the proverbial fag packet.

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[peterb]

Chart 5058 gives 11h 27m for Portsmouth.

If you're interested in tides can I recommend Chart 5058. It gives two sets of lines covering all UK and Irish waters and extending south to Brest and north to Kristiansund in Norway. One set of lines gives the Mean Spring Range, while the other gives the luni-tidal intervals. It's particularly interesting because it gives the tides not just at the coast, but also out at sea. Did you know that there are three places in the middle of the North Sea that have no rise and fall at all? And another between Scotland and Ireland?

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[AvanLoon]

When you (or any other reader) is interested in tides and the influence powers open this site:
http://www.getij.nl/engels/
Click on the links in the sidebar, and find out.

Comes from Dutch Ministry for Watercontrol (or how they mention theirselves in English)

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