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#1
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Heavy Air
Found the 'old' chart. It reads '' controlling depths in feet at Mean Low
Water (MLW)''. AND; depths reffered to soundings (MLW)''. Scotty "Scott Vernon" wrote in message ... Are you sure? Don't keep charts at the house, thus the ''I believe'' . SV "The_navigator©" wrote in message ... No they are not. Read the chart legend Cheers MC Scott Vernon wrote: I believe that charted depths are given at MLW and it's up to the sailor to know the tide table and apply it. |
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#2
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Heavy Air
How old is that chart? All of my US charts from the recent past use MLLW as the datum for
soundings. I even checked in my Chesapeake ChartKit to see if they were different. OK - Here's a quiz: What's the meaning of LLWLT? BTW, I thought of commenting on the "8 feet above MLW" also - around here we have 10 foot tides and flooding is measured above MHW "Scott Vernon" wrote in message ... Found the 'old' chart. It reads '' controlling depths in feet at Mean Low Water (MLW)''. AND; depths reffered to soundings (MLW)''. Scotty "Scott Vernon" wrote in message ... Are you sure? Don't keep charts at the house, thus the ''I believe'' . SV "The_navigator©" wrote in message ... No they are not. Read the chart legend Cheers MC Scott Vernon wrote: I believe that charted depths are given at MLW and it's up to the sailor to know the tide table and apply it. |
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#3
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Heavy Air
"Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... How old is that chart? All of my US charts from the recent past use MLLW as the datum for soundings. I even checked in my Chesapeake ChartKit to see if they were different. OK - Here's a quiz: What's the meaning of LLWLT? Lower Low Water Large Tide. Sounds similiar to LAT. Regards Donal -- |
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#4
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Heavy Air
If you were going to take the time to look it up, you could have at least said how it is
defined. "Donal" wrote in message ... "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... How old is that chart? All of my US charts from the recent past use MLLW as the datum for soundings. I even checked in my Chesapeake ChartKit to see if they were different. OK - Here's a quiz: What's the meaning of LLWLT? Lower Low Water Large Tide. Sounds similiar to LAT. Regards Donal -- |
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#5
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Heavy Air
Here (and the UK I believe) it is the "lowest astromical tide". If you
think about it, that is the only sensible datum for a _sounding_! Cheers MC Jeff Morris wrote: If you were going to take the time to look it up, you could have at least said how it is defined. "Donal" wrote in message ... "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... How old is that chart? All of my US charts from the recent past use MLLW as the datum for soundings. I even checked in my Chesapeake ChartKit to see if they were different. OK - Here's a quiz: What's the meaning of LLWLT? Lower Low Water Large Tide. Sounds similiar to LAT. Regards Donal -- |
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#6
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Heavy Air
No - LAT is "Lowest Astronomical Tide" or the lowest tide that would be predicted. LLWLT,
or "Lower Low Water Large Tide" is the average of the lowest low water for each year in a 19 year cycle. Presumably, LAT would be the lowest of the lowest low water in the 19 year cycle, not the average. "The_navigator©" wrote in message ... Here (and the UK I believe) it is the "lowest astromical tide". If you think about it, that is the only sensible datum for a _sounding_! Cheers MC Jeff Morris wrote: If you were going to take the time to look it up, you could have at least said how it is defined. "Donal" wrote in message ... "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... How old is that chart? All of my US charts from the recent past use MLLW as the datum for soundings. I even checked in my Chesapeake ChartKit to see if they were different. OK - Here's a quiz: What's the meaning of LLWLT? Lower Low Water Large Tide. Sounds similiar to LAT. Regards Donal -- |
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#7
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Heavy Air
According to Chapman;
MLW: the avg. height of all low waters at a place over a 19-year cycle. MLLW: the avg. height of the lower low waters over a 19-year cycle. SV "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... No - LAT is "Lowest Astronomical Tide" or the lowest tide that would be predicted. LLWLT, or "Lower Low Water Large Tide" is the average of the lowest low water for each year in a 19 year cycle. Presumably, LAT would be the lowest of the lowest low water in the 19 year cycle, not the average. "The_navigator©" wrote in message ... Here (and the UK I believe) it is the "lowest astromical tide". If you think about it, that is the only sensible datum for a _sounding_! Cheers MC Jeff Morris wrote: If you were going to take the time to look it up, you could have at least said how it is defined. "Donal" wrote in message ... "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... How old is that chart? All of my US charts from the recent past use MLLW as the datum for soundings. I even checked in my Chesapeake ChartKit to see if they were different. OK - Here's a quiz: What's the meaning of LLWLT? Lower Low Water Large Tide. Sounds similiar to LAT. Regards Donal -- |
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#8
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Heavy Air
"Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... No - LAT is "Lowest Astronomical Tide" or the lowest tide that would be predicted. LLWLT, or "Lower Low Water Large Tide" is the average of the lowest low water for each year in a 19 year cycle. Presumably, LAT would be the lowest of the lowest low water in the 19 year cycle, not the average. That would really depend on whether the lowest low had been predicted, wouldn't it? Anyway, LAT is much better than LLWLT. For one thing, you can remember the letters without having to look them up! Regards Donal -- |
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#9
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Heavy Air
"Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... If you were going to take the time to look it up, you could have at least said how it is defined. Don't be churlish! You didn't say that we weren't allowed to use Google....Gimme the points! Regards Donal -- |
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#10
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Heavy Air
Well, right under the sea serpent and above the mermaid it says '' 1927
DATUM , Soundings in Feet at MLW'' Low Low Water Low Tide????? SV "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... How old is that chart? All of my US charts from the recent past use MLLW as the datum for soundings. I even checked in my Chesapeake ChartKit to see if they were different. OK - Here's a quiz: What's the meaning of LLWLT? BTW, I thought of commenting on the "8 feet above MLW" also - around here we have 10 foot tides and flooding is measured above MHW "Scott Vernon" wrote in message ... Found the 'old' chart. It reads '' controlling depths in feet at Mean Low Water (MLW)''. AND; depths reffered to soundings (MLW)''. Scotty "Scott Vernon" wrote in message ... Are you sure? Don't keep charts at the house, thus the ''I believe'' . SV "The_navigator©" wrote in message ... No they are not. Read the chart legend Cheers MC Scott Vernon wrote: I believe that charted depths are given at MLW and it's up to the sailor to know the tide table and apply it. |
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