On Fri, 01 Dec 2006 14:12:52 GMT, keith_nuttle
wrote:

Since the nautical mile is defined as one minute of latitude, I doubt it
will ever disappear in earth based navigation.

The Nautical Mile was originally based on a minute of latitude, but
the length of a minute of latitude varies with latitude, so an
International Nautical Mile is now defined as 1852 metres exactly, or
6076.11549 US feet, approximately, according to Bowditch.

Peter Bennett wrote:
On Fri, 01 Dec 2006 14:12:52 GMT, keith_nuttle
wrote:


Since the nautical mile is defined as one minute of latitude, I doubt it
will ever disappear in earth based navigation.


The Nautical Mile was originally based on a minute of latitude, but
the length of a minute of latitude varies with latitude, so an
International Nautical Mile is now defined as 1852 metres exactly, or
6076.11549 US feet, approximately, according to Bowditch.



I believe that the nautical mile is based on the minute of LONGITUDE not
latitude. Longitude doesn't vary with changes in latitude (or attitude).
That's why when you are using paper charts (remember those) you measure
the distance with your dividers on the longitude scale on the east or
west side of the chart.
krj

"krj" wrote in message
. ..
Peter Bennett wrote:
On Fri, 01 Dec 2006 14:12:52 GMT, keith_nuttle
wrote:


Since the nautical mile is defined as one minute of latitude, I doubt it
will ever disappear in earth based navigation.


The Nautical Mile was originally based on a minute of latitude, but
the length of a minute of latitude varies with latitude, so an
International Nautical Mile is now defined as 1852 metres exactly, or
6076.11549 US feet, approximately, according to Bowditch.



I believe that the nautical mile is based on the minute of LONGITUDE not
latitude. Longitude doesn't vary with changes in latitude (or attitude).
That's why when you are using paper charts (remember those) you measure
the distance with your dividers on the longitude scale on the east or west
side of the chart.
krj

Where do you guys get this?? You have it 180 degrees backward. Or, is this a
troll? :-)

http://powerboat.about.com/od/forms_..._Longitude.htm

--
"j" ganz @@
www.sailnow.com

krj wrote:
Peter Bennett wrote:
On Fri, 01 Dec 2006 14:12:52 GMT, keith_nuttle
wrote:


Since the nautical mile is defined as one minute of latitude, I doubt it
will ever disappear in earth based navigation.


The Nautical Mile was originally based on a minute of latitude, but
the length of a minute of latitude varies with latitude, so an
International Nautical Mile is now defined as 1852 metres exactly, or
6076.11549 US feet, approximately, according to Bowditch.



I believe that the nautical mile is based on the minute of LONGITUDE not
latitude. Longitude doesn't vary with changes in latitude (or attitude).
That's why when you are using paper charts (remember those) you measure
the distance with your dividers on the longitude scale on the east or
west side of the chart.
krj

What? Longitude doesn't vary with latitude??????
Are you also saying that Latitude DOES vary with regards to
longitude??????

krj wrote:
Peter Bennett wrote:

On Fri, 01 Dec 2006 14:12:52 GMT, keith_nuttle
wrote:


Since the nautical mile is defined as one minute of latitude, I doubt
it will ever disappear in earth based navigation.



The Nautical Mile was originally based on a minute of latitude, but
the length of a minute of latitude varies with latitude, so an
International Nautical Mile is now defined as 1852 metres exactly, or
6076.11549 US feet, approximately, according to Bowditch.



I believe that the nautical mile is based on the minute of LONGITUDE not
latitude. Longitude doesn't vary with changes in latitude (or attitude).
That's why when you are using paper charts (remember those) you measure
the distance with your dividers on the longitude scale on the east or
west side of the chart.
krj

Agree.. that's what they taught us in the Power & Sail Squadron courses.

In article ,
krj wrote:

Peter Bennett wrote:
On Fri, 01 Dec 2006 14:12:52 GMT, keith_nuttle
wrote:


Since the nautical mile is defined as one minute of latitude, I doubt it
will ever disappear in earth based navigation.


The Nautical Mile was originally based on a minute of latitude, but
the length of a minute of latitude varies with latitude, so an
International Nautical Mile is now defined as 1852 metres exactly, or
6076.11549 US feet, approximately, according to Bowditch.



I believe that the nautical mile is based on the minute of LONGITUDE not
latitude. Longitude doesn't vary with changes in latitude (or attitude).
That's why when you are using paper charts (remember those) you measure
the distance with your dividers on the longitude scale on the east or
west side of the chart.
krj

Hmmmmm..... I think you have your terms "Wrapped around the Axle"
here.... Nautical Miles is based on "Minute of Latitude" which does
NOT change since the distance from the Equater to the Poles is ALWAYS
the SAME, from any place on the EQUATER. Therefor, when dividing that
distance in Degrees, MInutes, and Seconds, will ALWAYS produce the same
Unit Lengths. Where as Longitude is the cicumfrence of the earth at
the equater divided into Degrees, Minutes, and Seconds, and that DOES
change Unit length as you move closer to the Poles. Longitude is marked
on the bottom and top of Maps, where Latitude is marked on the right and
left had edges of Maps. One ALWAYS uses the Latitude markings for
distance because they do NOT change Unit Length, EVER.....

Bruce in alaska
--
add a 2 before @

"Roger Long" wrote in news:0zWbh.31688$zB4.19393
@twister.nyroc.rr.com:

Isn't KPS "Knots per Hour" = "Knots"?


Knots per hour, would be a unit of acceleration because "knots" means
"nautical miles per hour". Knots per hour = "nautical miles per hour per
hour". We sailors only DREAM of acceleration....(c;

Larry
--
If we eliminate religion, will they stop murdering each other?

On Sat, 02 Dec 2006 01:42:57 -0500, Larry wrote:

"Roger Long" wrote in news:0zWbh.31688$zB4.19393
:

Isn't KPS "Knots per Hour" = "Knots"?


Knots per hour, would be a unit of acceleration because "knots" means
"nautical miles per hour". Knots per hour = "nautical miles per hour per
hour". We sailors only DREAM of acceleration....(c;

Larry

You can use knots per hour to measure deceleration, too... :-)
(or should it be furlongs per fortnight? I always started the engine
when the Loran-gave an ETE of 99 hours.)


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca

Peter Bennett wrote in
news.com:

You can use knots per hour to measure deceleration, too... :-)
(or should it be furlongs per fortnight? I always started the engine
when the Loran-gave an ETE of 99 hours.)



Yeah, but "deceleration" usually means we just ran aground and sailors
never like to think about "deceleration"...(c;

Larry
--
If we eliminate religion, will they stop murdering each other?

Oliver Fleming wrote:
Hi,
I have been told that all new equipment, chartplotters, speedometers and
the like will not have knots as a speed option.
Knots will be phased out and KPH will be the new standard for marine
equipment.

Has anybody heard of this?

If so where?

Some links please if available.

Thanks
Oliver Fleming


I can see it now:

A CA or EUR boat shopper looks at a runabout.

Shopper: One little thing that bothers me is that the speedometer reads
in kph, rather than knots. Is there an option to get a speedometer that
reads in knots?

Unprofessional salesperson: Oh no. Of course not. Didn't you know that
all new navigation equipment will eliminate knots as a unit of
measurement and the new worldwide standard will be kph?

****

Sometimes a depth sounder is appropriate in the showroom, where it has
been known to get piled up pretty deep indeed. :-)