Fog, DR and traffic lights.
 

If this is all you know about DR, its a good thing you don't actually go
sailing. There are many things you "know for sure" if only you have the
intelligence to understand them.



"JAXAshby" wrote in message
...
and goes to where??

jeffies, the ONLY thing you know for sure in DR is where you started, and you
don't even know where that is for sure once you are moving. ask your wife to
explain it to you.

Wrong jaxie. Every DR plot starts with a reference point. You're just
showing
you have no idea what you're talking about.



"JAXAshby" wrote in message
...
absolutely not. DR has no reference points in it, and I have never stated
that
it does.

Subject: Fog, DR and traffic lights.
From: (JAXAshby)
Date: 07/18/2004 12:06 Pacific Standard Time
Message-id:

Who changed the definition to include landmarks?

jeffies.


No he didn't, you did.
Typically, with your poor reading comprehension and lack of abilities
where
navigation is concerned, you took a statement you didn't understand and
tried
to turn it to your advantage.
Jeff said nothing about pilotage ... you did; Jeff said nothing about
using
landmarks .... you did.
Jeff's comment was that when you start someplace, you know where you are
(he
can correct me if I'm wrong) .... you could not understand this and
manufactured the rest.

Shen

Fog, DR and traffic lights.
 

If that's the criterion, then the North Pole is a good reference point.


"JAXAshby" wrote in message
...
the starting point is no longer a reference point once you are moving, because
you no longer know where it is in relation to where your boat is.

this ain't hard stuff, dood. every pilot on the planet knows it.

absolutely not. DR has no reference points in it, and I have never stated
that
it does.

In that case, you best look up "reference point". The starting point of
a DR plot is generally at a known reference point and it can easily be
said that the ending point of your DR is also a reference point.

LOL Why is it, every time I open a Jax post now, my computer starts
playing the music from "Twilight Zone"?

otn

Fog, DR and traffic lights.
 

"JAXAshby" wrote in message
...
jeffies, DR is just guessing, and the degree of uncertainty can not be
determined. That is physically impossible.

And why is this "qualitatively different" from any other method of navigation?


remember, jeffies, when you claimed to have a degree in physics from some
junior college? Well, if you had that associates degree in physics you might
have heard of the PhD thesis written a hundred some years ago by a young man
by
the Al Einstein.

Please, can you explain how "On a new determination of molecular dimensions"
relates to this problem? You don't even know what Bert's thesis actually was!




One
could also say that the compass represents another reference

no, one can not. one can ONLY state which direction magnetic North is and
which direction relative to that the boat is pointed, but *no* deduction
can
be
made as to which direction actually is actually going. none.

I never claimed you had absolute certainty with infinite precision about the
direction of travel. You're the one claiming that's the only definition of
DR.
In fact, formally speaking, the DR plot by itself makes no such presumption;
it
only describes the position based on the ship's heading and speed through the
water. If you had any understanding of DR you would know this. Once again,
you
just prove you don't know what DR is.





but that would be
too complex for jaxie.

wasn't too complex for Einstein when he wrote his PhD thesis on the
subject.
you can read that thesis, if you want, by looking up The Special Theory of
Relativity.

Einstein's PhD thesis was not special relativity, it was "A New Determination
of
Molecular Dimensions." And Special Relativity did not focus on the relative
motion issues that are significant for ship's navigation. That was fully
addressed by Galileo in his "Theory or Relativity" 300 years earlier.
Einstein
only mentioned it by way of recapitulating traditional physics before showing
how Special Relativity is different. It looks like this is yet another topic
where you can show your ignorance.

Fog, DR and traffic lights.
 

you still haven't told us which light.

it made no difference WHICH light, for ALL lights are important there. At
least as far as we were concerned.

Fog, DR and traffic lights.
 

Frankly, I can remember virtually every major landmark I've passed in the
last 5
years or so

both of them?

Fog, DR and traffic lights.
 

JAXAshby wrote:
it can easily be
said that the ending point of your DR is also a reference point.


while it may be easily said, it is in no way accurate, for you do not with any
degree of certainty just where you are once you have started. It is physically
impossible to know.


Wait a bit while I turn down the volume on my speakers .... damn
"twighlight zone " music is gettin louder....... there..... now.....

huh?

otn

Fog, DR and traffic lights.
 

JAXAshby wrote:
jeffies, DR is just guessing, and the degree of uncertainty can not be
determined. That is physically impossible.

remember, jeffies, when you claimed to have a degree in physics from some
junior college? Well, if you had that associates degree in physics you might
have heard of the PhD thesis written a hundred some years ago by a young man by
the Al Einstein.


UHOH, look out!!!! Jax is gettin serious now, he's pulling out his big
guns, ole Albie Einstein !!!!

Fog, DR and traffic lights.
 

JAXAshby wrote:
you
just prove you don't know what DR is.


well, what you claim is fine navigation practise has been illegal for pilots
(who easily understand why) for seventy some years.


Ummmmm jax, we's talkin boats here.

Fog, DR and traffic lights.
 

JAXAshby wrote:
No, and that sort of thinking has been illegal for pilots to put into practise
for seventy some years. there is a reason why it is illegal. a good,
scientific reason.

Oh GOODY !!! The next time I'm flyin in a boat at 20,000 feet, I'll keep
that in mind!!!

Ya didn't understand me, did ya?

otn



One
could also say that the compass represents another reference


no, one can not. one can ONLY state which direction magnetic North is and
which direction relative to that the boat is pointed, but *no* deduction

can be

made as to which direction actually is actually going. none.

Wrong. If someone has experience with ones particular boat, one has
experienced in the past similar conditions, so that one has an educated
feel for how much set one has under many conditions, which one can apply
to ones magnetic heading to determine which direction one is actually going.

otn

Fog, DR and traffic lights.
 

jeffies, I know what every physicist on the planet knows (as you would too *if*
you have the degree in physics you claim) and what every pilot on the planet
knows.

If this is all you know about DR, its a good thing you don't actually go
sailing. There are many things you "know for sure" if only you have the
intelligence to understand them.



"JAXAshby" wrote in message
...
and goes to where??

jeffies, the ONLY thing you know for sure in DR is where you started, and
you
don't even know where that is for sure once you are moving. ask your wife
to
explain it to you.

Wrong jaxie. Every DR plot starts with a reference point. You're just
showing
you have no idea what you're talking about.



"JAXAshby" wrote in message
...
absolutely not. DR has no reference points in it, and I have never
stated
that
it does.

Subject: Fog, DR and traffic lights.
From: (JAXAshby)
Date: 07/18/2004 12:06 Pacific Standard Time
Message-id:

Who changed the definition to include landmarks?

jeffies.


No he didn't, you did.
Typically, with your poor reading comprehension and lack of abilities
where
navigation is concerned, you took a statement you didn't understand and
tried
to turn it to your advantage.
Jeff said nothing about pilotage ... you did; Jeff said nothing about
using
landmarks .... you did.
Jeff's comment was that when you start someplace, you know where you
are
(he
can correct me if I'm wrong) .... you could not understand this and
manufactured the rest.

Shen