Fog, DR and traffic lights.
 

"JAXAshby" wrote in message
...
sailor Al knew a thing or two about both sailing and relative motion. he is
considered worth listening to by five generations of physicists now.


Yes, but that was not what his thesis was about, nor was it important to Special
Relativity. And it wasn't anything new, since it was fully developed by Galileo
in his ""Theory of Relativity" 300 years earlier. The fact that you keep
invoking Einstein's name in this just shows you have no understanding of his
work.

-jeff "I like sailing because it is the sport which demands the least energy”
Albert Einstein

Fog, DR and traffic lights.
 

ROFLMAO I'm just confused as to how a human brain can have such a
"scattered" view of such a simple subject as is shown by your post.

otn

JAXAshby wrote:
confused, are ya over the knee? seems so.


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.
 

Physicists, yes. Don't know too many navigators that listen to him on
navigation..... not enough practical experience.

JAXAshby wrote:
sailor Al knew a thing or two about both sailing and relative motion. he is
considered worth listening to by five generations of physicists now.


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.
 

This from a weekend warrior who might actually be on the water one
month out of any given year ..... generally, as a deckhand/gopher.
Jax, I don't know how much you know about aircraft navigation, but if
it's at anywhere near the level of your knowledge on boating navigation,
you rank down about "rank amateur wannabe", so I take your statement
with a grain of salt.

otn

JAXAshby wrote:
there is no qualitative difference between navigating boats or airplanes.


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.
 

Repeat: Ya didn't understand me, didya?

otn

JAXAshby wrote:
it is illegal to fly at 20,000 feet with only a compass and a speed indicator
onboard.


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.
 

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.

He was a crap navigator.

Cheers

Fog, DR and traffic lights.
 

JAXAshby wrote:
In the final days of sail powered commercial shipping, 25 out of every 100
ships sank at sea (remainder snipped)

No, they didn't. That's ridiculous. Take a look at insurance rates of
the day.

DSK