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    Tidal constants
    From: Geoffrey Butt
    Date: 2006 Sep 1, 07:17 -0500

    Is there an open source for the latest tidal constants for UK ports - other
    than by buying Vol 1 of this year's Admiralty Tide Tables?
    I see that US port constants are available free on the internet, but it
    wouldn't be a surprise in our 'Thatcherised' society that such information
    for the UK has to be paid for:  the same philosophy as for access to weather
    I have written, for interest really, a programme to calculate tide heights
    from the Meeius(?) algorithms which works accurately enough for most
    practical purposes.  Times of high and low water are pretty good - who can
    spot the precise moments of these anyway? - but tide heights (for the nicer
    places to visit!) depend on the topographical shifts which are reflected in
    the most recent tidal constants.

    Geoff Butt

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