Pathfinder Tide Question
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  1. #1
    Member kevinkar's Avatar
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    Question Pathfinder Tide Question

    So on a Casio that has tide graphs, do you have to enter the first high tide info every day you want to read the tide graph or does it take the info once and is reasonably accurate for "a while"?

    Full disclosure - I don't really use the tide graph function but I DO want to understand it on my Pathfinder PAW-1500.

    So today the first high tide is X AM per published local tide tables. I enter the tide graph function and update that time so, for the rest of the day, the watch will show the tides properly for my location (Southern California.) But what about tomorrow? The tides are generally close to what they were the day before so the graph is not going to be horribly off but do I have to enter the high tide every day to have it be more than generally close? If not, how long can I go before updating the time?

    The manual does not really say you can set it once and forget it but it also doesn't say you have to update it every day. So I was wondering what it is.

    Anyone know for sure?

  2. #2
    Member GaryK30's Avatar
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    Re: Pathfinder Tide Question

    The tide function on Casios is designed for semidiurnal tides (two high tides per day). It doesn't work for diurnal tides (one high tide per day) or mixed tides. So Cal has mixed tides, in this case semidiurnal tides with a significant variation. On my Casio tide watches that use the "first high tide" setting, I notice that the high tide times can vary by up to two hours or so compared to reality.
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  3. #3
    Member GaryK30's Avatar
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    Re: Pathfinder Tide Question

    This map shows the tide type by location.

    https://en.wikipedia.org/wiki/Tide#/..._types_map.jpg

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  5. #4
    Member kevinkar's Avatar
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    Re: Pathfinder Tide Question

    Yeah, skipping through the hours after setting first high tide time shows high and low tides that don't really reflect what's in the published tide tables. So the watch is not necessarily that "useful" when you get right down to it. But the question still remains.... Feed it data every day or every so often to be "close" to reality where it works?

  6. #5
    Member GaryK30's Avatar
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    Re: Pathfinder Tide Question

    Quote Originally Posted by kevinkar View Post
    Yeah, skipping through the hours after setting first high tide time shows high and low tides that don't really reflect what's in the published tide tables. So the watch is not necessarily that "useful" when you get right down to it. But the question still remains.... Feed it data every day or every so often to be "close" to reality where it works?
    With mixed tides, you'll have to set the first high tide time every day if you want it to be accurate.
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  7. #6
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    Re: Pathfinder Tide Question

    I think there are some digital surfers watches from Nixon/Freestyle and such which do have reference sets for location and can do something more advanced.
    Casio is fairly simple affair. On many models it even more simplified with no tide delay/coordinates - just time zone and that's it.
    Pathinders/ProTreks are among most advanced Casio watches along with fishing/hunting timers and Casio Glide. But still like been said it only one high tide a day.
    Not sure about rangebeast it smart watch in a sense and can be more sophisticated.
    It should be special!

  8. #7
    Member GaryK30's Avatar
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    Re: Pathfinder Tide Question

    Quote Originally Posted by Rocket1991 View Post
    I think there are some digital surfers watches from Nixon/Freestyle and such which do have reference sets for location and can do something more advanced.
    Casio is fairly simple affair. On many models it even more simplified with no tide delay/coordinates - just time zone and that's it.
    Pathinders/ProTreks are among most advanced Casio watches along with fishing/hunting timers and Casio Glide. But still like been said it only one high tide a day.
    Not sure about rangebeast it smart watch in a sense and can be more sophisticated.
    The earlier Casio tide models use data inputs of the longitude and the lunitidal interval, while the newer models use the home city to determine the approximate longitude and the first high tide time for fine tuning of the calculated lunitidal interval. Both types are designed for two high tides per day.

    I'm not sure if the GPR-B1000 can also handle one high tide per day. Someone would have to test this. Also, as far as I know, the tide graph on the GPR-B1000 always defaults to 6 AM on the current day. It would be nice if it could optionally be set default to the current time on the current day.
    memento_mori likes this.

  9. #8
    Member Seabee1's Avatar
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    Re: Pathfinder Tide Question

    Try this, it may work for you (or not)

    Lunitidal Interval - Calculator
    http://veteranswatchmakerinitiative.org/
    Training Combat Disabled Vets to become Watchmakers
    https://www.gofundme.com/VWIBulova

  10. #9
    Member memento_mori's Avatar
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    Re: Pathfinder Tide Question

    Tide is very complex. No watch ever can calculate the real tides. It is a hint, but if you really need the exact tide, you have to look it up.

    Even very good institutions like the German Bundesamt für Schifffahrt und Hydrographie publish only forecasts. Changing factors like the wind can always change real tide in time and amount.

  11. #10
    Member kevinkar's Avatar
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    Re: Pathfinder Tide Question

    Ok, thanks for the replies and good info.
    memento_mori likes this.

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