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29-11-2011, 15:36
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#46
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: Reading a Chart in Metres
I grew up pre-decimalisation and pre metric. Even now everyone uses imperial weight ( stones) and buys their timber in feet and inches ( even if you get the equivalent metric size).
But Ive grown used to it, if tell me dimensions in mm or metres I can visualise it and I can do sq metres, even though sq foot is more natural to me.
I never understood the difficulties in the US with it, its no big deal. but then the US makes a point of not doing what others do , even if its the right thing
( ICC, Kyoto, metric, MMSI ,etc)
Dave
__________________
Interested in smart boat technology, networking and all things tech
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29-11-2011, 15:53
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#47
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Registered User
Join Date: Nov 2010
Location: Lafayette, Louisiana
Boat: Ketch, Hardin 45
Posts: 440
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Re: Reading a Chart in Metres
Quote:
Originally Posted by bewitched
Yeah, the imperial system was much easier. . You knew that there were
12 inches in a foot
3 feet in a yard
22 yards in a chain
10 chains in a furlong
8 furlongs in a mile
And a mile was 1760 yards or 5280 feet.
Ahh... But that was a land mile and those were land measurements. Regarding the sea there were
6 feet in a fathom
15 fathoms in a cable
There wasn't a relationship between a fathom and the next one ... A cable
But there was 608 feet in a cable and so
10 cables in a nautical mile.
Which was 6080feet
Which is the only measurement that makes any sense as in is the same length as one minute of arc of latitude at the equator....well give or take a few feet.
But if say you wanted to measure cloth, or area, or volume, or pressure, or energy, or....
Well, then it got a bit tricky.
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Oopsie!! It is 15 fathoms in a shot of chain. And the shot is part of the anchoring system on a ship. And there are 9 to 11 shots for each anchor.
Cable length:
UK; 700 feet
US; 720 feet = to 8 shots of chain
Nautical mile = 6076.11548556 feet = 1.852 Kilometers = 1 minute of lattitude
Navigators consider that one minute of lattitude equal to 6000 ft and we don't worry about the 76.+ ft buried inside that 6000 ft.
There a few other minor mistakes in this thread... But who will quible over minor details.
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29-11-2011, 16:31
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#48
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Moderator
Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 20,555
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Re: Reading a Chart in Metres
Quote:
Originally Posted by goboatingnow
I grew up pre-decimalisation and pre metric. Even now everyone uses imperial weight ( stones) and buys their timber in feet and inches ( even if you get the equivalent metric size).
But Ive grown used to it, if tell me dimensions in mm or metres I can visualise it and I can do sq metres, even though sq foot is more natural to me.
I never understood the difficulties in the US with it, its no big deal. but then the US makes a point of not doing what others do , even if its the right thing
( ICC, Kyoto, metric, MMSI ,etc)
Dave
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What are ICC and MMSI?
__________________
Num Me Vexo?
For all of your celestial navigation questions: https://navlist.net/
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
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29-11-2011, 16:34
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#49
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Registered User
Join Date: Dec 2010
Location: B.C.,Canada
Boat: 29'
Posts: 2,423
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Re: Reading a Chart in Metres
Quote:
Originally Posted by nigel1
Are you thinking relations are any better now than they were
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wayy off thread now but Why Yanks not going metric after all the French did for them in their Revolution?
I bet Ben Franklin wanted to go metric...
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29-11-2011, 16:35
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#50
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Registered User
Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
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Re: Reading a Chart in Metres
Quote:
Originally Posted by Adelie
What are ICC and MMSI?
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More disputes between the US and the rest of the world.
You will be assimilated! We are Borg!
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
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29-11-2011, 16:37
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#51
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Registered User
Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
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Re: Reading a Chart in Metres
Quote:
Originally Posted by HappySeagull
wayy off thread now but Why Yanks not going metric after all the French did for them in their Revolution?
I bet Ben Franklin wanted to go metric...
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And what we did for the Brits and Europe during WWII. What's the difference?
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
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29-11-2011, 16:41
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#52
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Moderator
Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 20,555
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Re: Reading a Chart in Metres
Quote:
Originally Posted by HappySeagull
wayy off thread now but Why Yanks not going metric after all the French did for them in their Revolution?
I bet Ben Franklin wanted to go metric...
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Ben predated the Metric System.
__________________
Num Me Vexo?
For all of your celestial navigation questions: https://navlist.net/
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
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29-11-2011, 16:42
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#53
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Moderator
Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 20,555
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Re: Reading a Chart in Metres
Quote:
Originally Posted by delmarrey
More disputes between the US and the rest of the world.
You will be assimilated! We are Borg!
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Amusing but not informative.
__________________
Num Me Vexo?
For all of your celestial navigation questions: https://navlist.net/
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
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29-11-2011, 16:43
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#54
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Registered User
Join Date: Dec 2010
Location: B.C.,Canada
Boat: 29'
Posts: 2,423
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Re: Reading a Chart in Metres
..Well,old wounds aside-"Freedom Fries" included?-from experience here in Canada,"going metric" is a wonderful opportunity to shrink all the packaging and charge you the same $$,so be careful what some of you technically-inclined Americans wish for....
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29-11-2011, 16:50
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#55
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: Reading a Chart in Metres
Quote:
Originally Posted by Adelie
What are ICC and MMSI?
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ICC = International Criminal Court
MMSI, Maritime Mobile service Indentify, the US has a system of giving them out thats different to everyone else ( but its a small thing)
how about these ones though
UN convention on the rights of the child not ratifed ( The only other country that didnt was Somalia!)
Convention on the Elimination of All Forms of Discrimination against Women( not ratified, ( also not ratified was Iran, Nauru, Palau, Somalia, Sudan and Tong)
Convention for the Protection of all Persons from Enforced Disappearance
Mine Ban Treaty
Convention on Cluster Munitions
Convention on the Rights of Persons with Disabilities (CRPD)
Optional Protocol to the Convention against Torture
etc etc
OK.
PS not looking for a debate just pointing out the US seems to be different.( or out of step if you like)
Dave
__________________
Interested in smart boat technology, networking and all things tech
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29-11-2011, 16:54
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#56
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Registered User
Join Date: Dec 2010
Location: B.C.,Canada
Boat: 29'
Posts: 2,423
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Re: Reading a Chart in Metres
Quote:
Originally Posted by Adelie
Ben predated the Metric System.
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true,I am corrected,as to adoption but will you grant it seems to have been a topic in his time and acquaintance?But perhaps I give him too much credit.
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29-11-2011, 18:30
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#57
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Moderator
Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 20,555
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Re: Reading a Chart in Metres
Quote:
Originally Posted by HappySeagull
true,I am corrected,as to adoption but will you grant it seems to have been a topic in his time and acquaintance?But perhaps I give him too much credit.
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I was being a little too pedantic.
__________________
Num Me Vexo?
For all of your celestial navigation questions: https://navlist.net/
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
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29-11-2011, 22:52
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#58
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Registered User
Join Date: Nov 2011
Location: Portugal
Boat: jeanneau ,flirt ,6 mètres
Posts: 5
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Re: Reading a Chart in Metres
let we see which system chineeses and indians will choose
I wasn't knowing about the new standart of the french maps ,not sailing since 30 years
this sort of metrics angles have been tried after the french revolution ,by 1789 ,as the meridian of Paris ,good busness for editors anyway
I know by an english teacher that english system nead two years of school ,but sure ,if it is your system it is the good one ,
I have use part of it for wood construction ,but saying 2x3 or 1/2,without thumb or feet ,and now I know the two ways for my watering system , well ,I may not say that I prefer the english way but I am used of it
the metric system was to stop chatering about the different lenght between towns and countries,what was a foot there was a foot and a finger 10 miles away ,but english power have regulate this problem over the world
french just take an over politic reference or human reference to be abble to be accept by the world
but the fact to have a complex system is better for the brain and give you an advantage
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29-11-2011, 23:10
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#59
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Registered User
Join Date: Sep 2009
Location: Melbourne, Australia
Posts: 2,844
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Re: Reading a Chart in Metres
why doesn't the OP just work out their safety depth in meters and just compare that number on the chart.
Metric is not very hard to understand
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30-11-2011, 00:03
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#60
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Registered User
Join Date: Aug 2011
Location: South Australia
Posts: 221
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Re: Reading a Chart in Metres
Quote:
Originally Posted by HappySeagull
Body Parts-that's the way to go....a cubit(elbow to fingertip),an inch(a finger joint) an eyelash,a hair,a palm,a foot(great to measure with),a fathom(-enough to drown in)-these will never be replaced
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Not to mention a hand. (For horses, which is standardised at 4" or 101.6mm)
The problem is that not all people's body parts are conveniently the same length. My foot is not 12" (or 30cm) long. Closer to 11". If you are working exclusively with your own body parts, it works moderatly well, until the time you need to put it somewhere dangerous and it gets crushed or whatever, however when you need to work with someone else with a larger or smaller foot than yours it gets complicated.
I'm not going to start a body part size thread here. The connotations may become offensive to some.
AussieGeoff
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