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#1
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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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#2
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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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#3
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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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#4
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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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#5
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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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#6
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Heavy Air
Very Good.
Another quiz: What's the meaning of "Lower Low"? "Scott Vernon" wrote in message ... 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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#7
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Heavy Air
That would be when there are two low tides in a day, the lower one being
''Lower Low''. ??????? "Jeff Morris" jeffmo@NoSpam-sv-lokiDOTcom wrote in message ... Very Good. Another quiz: What's the meaning of "Lower Low"? "Scott Vernon" wrote in message ... 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
The LAT is the lowest predicted tide, not necessarily the lowest tide that ever occurred.
Its quite possible for weather conditions to create an even lower tide, but LAT, LLWLT, MLW, and MLLW all relate to astronomical predictions, not the actual observations. I wonder how frequently they adjust for the rising sea level? -jeff "Donal" wrote in message ... "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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#10
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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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