Pocket Pelorus
 

What can you use the following bow and beam bearings to find?

22-34, 25-41 , 26&1/2-45, 27-46 , 29-51 , 32-59 .

All numbers are degrees off your bow.

And you travel 5 miles between the bearings.

Worth 5 asa points

Joe
MSV RedCloud

Pocket Pelorus
 

Joe wrote:

What can you use the following bow and beam bearings to find?
22-34, 25-41 , 26&1/2-45, 27-46 , 29-51 , 32-59 .
All numbers are degrees off your bow.
And you travel 5 miles between the bearings.

Something lying in a straight line which is parallel to my course - a series
of coastal features or a line of marker buoys, perhaps? The line is a little
shorter than my distance covered (4.5 miles). At the start of my journey,
the nearest point on the line is about 9 miles away, bearing roughly 33
degrees. If my course and the line of targets were extended, my course would
be 5 miles from the line. The middle pair of targets (26&1/2-45, 27-46) are
very close together - 0.14 miles.


--
Wally
www.artbywally.com
www.wally.myby.co.uk/music

Pocket Pelorus
 

Wally wrote:

... about 9 miles away, bearing roughly 33 degrees.

Sorry, it bears 32 degrees (off the bow). The final target bears 34 degrees
after I've covered 5 miles.


--
Wally
www.artbywally.com
www.wally.myby.co.uk/music

Pocket Pelorus
 

Joe wrote:
What can you use the following bow and beam bearings to find?

22-34, 25-41 , 26&1/2-45, 27-46 , 29-51 , 32-59 .

All numbers are degrees off your bow.

And you travel 5 miles between the bearings.

Worth 5 asa points

Joe
MSV RedCloud
These are not "bow and beam" bearings. What they are, are a set of
bearings that if you mark the time of each set, the distance run between
them will be the distance off when abeam. (5 mi.)
These come from "Special cases" and include "bow and beam", "doubling
the angle on the bow", "7 tenths rule", "7/3rd rule"

Pocket Pelorus
 

otnmbrd wrote in message link.net...
Joe wrote:
What can you use the following bow and beam bearings to find?

22-34, 25-41 , 26&1/2-45, 27-46 , 29-51 , 32-59 .

All numbers are degrees off your bow.

And you travel 5 miles between the bearings.

Worth 5 asa points

Joe
MSV RedCloud
These are not "bow and beam" bearings.

Well I use bow and beam as a general term for this type of
navigation.



What they are, are a set of
bearings that if you mark the time of each set, the distance run between
them will be the distance off when abeam. (5 mi.)

Very good, but why do you call them special cases. All give the same
results.


These come from "Special cases" and include "bow and beam", "doubling
the angle on the bow", "7 tenths rule", "7/3rd rule"

We often used a Pelorus to find the really good fishing spots near
pipeline junctions, back in the loran days.

Im in the process of painting a bearing board on my dash.

And please..... your a seasoned licenced Master. Lets give the young
yachtmster wannabe's a chance to answer.

Im still amazed at wallys answer.

Joe
MSV RedCloud

Pocket Pelorus
 

Joe wrote:

Im still amazed at wallys answer.

May I ask why?


--
Wally
www.artbywally.com
www.wally.myby.co.uk/music

Pocket Pelorus
 

Joe wrote:
otnmbrd wrote

These are not "bow and beam" bearings.


Well I use bow and beam as a general term for this type of
navigation.

I'll buy that.



What they are, are a set of

bearings that if you mark the time of each set, the distance run between
them will be the distance off when abeam. (5 mi.)


Very good, but why do you call them special cases. All give the same
results.

That's how I originally learned them .... as "special cases" we all
needed to memorize/know for coastal navigation. When I first started
sailing, their use was the "norm".



These come from "Special cases" and include "bow and beam", "doubling
the angle on the bow", "7 tenths rule", "7/3rd rule"


We often used a Pelorus to find the really good fishing spots near
pipeline junctions, back in the loran days.

Im in the process of painting a bearing board on my dash.

And please..... your a seasoned licenced Master. Lets give the young
yachtmster wannabe's a chance to answer.

LOL Actually, I find that many in the group are more current and up to
date on many areas of navigation, than I am. Through lack of use, I've
forgotten the details of many applications. My advantage may lie solely
in the fact that frequently, something will tweak a memory, and I
generally know where to look for the info and can easily relate to it,
once found.
Normally I leave these questions alone, but didn't appear anyone was
finding the answer.

otn

Pocket Pelorus
 

"otnmbrd" wrote in message
ink.net...


Actually, I find that many in the group are more current and up to
date on many areas of navigation, than I am.

Correct!


Regards


Donal
--

Pocket Pelorus
 

"otnmbrd" wrote in message
ink.net...


Joe wrote:
What can you use the following bow and beam bearings to find?

22-34, 25-41 , 26&1/2-45, 27-46 , 29-51 , 32-59 .

All numbers are degrees off your bow.

And you travel 5 miles between the bearings.

Worth 5 asa points

Joe
MSV RedCloud
These are not "bow and beam" bearings. What they are, are a set of
bearings that if you mark the time of each set, the distance run between
them will be the distance off when abeam. (5 mi.)
These come from "Special cases" and include "bow and beam", "doubling
the angle on the bow", "7 tenths rule", "7/3rd rule"

OMG!!! I really don't believe it!


Are you saying that these are figures that are useful to people who are
"mathematically challenged"? ... Like Rednecks???


Are there people out there who are too stupid to take a running fix????



Regards


Donal
--

Pocket Pelorus
 

Donal wrote:
"otnmbrd" wrote

Joe wrote:

What can you use the following bow and beam bearings to find?

22-34, 25-41 , 26&1/2-45, 27-46 , 29-51 , 32-59 .

All numbers are degrees off your bow.

And you travel 5 miles between the bearings.

Worth 5 asa points

Joe
MSV RedCloud

These are not "bow and beam" bearings. What they are, are a set of
bearings that if you mark the time of each set, the distance run between
them will be the distance off when abeam. (5 mi.)
These come from "Special cases" and include "bow and beam", "doubling
the angle on the bow", "7 tenths rule", "7/3rd rule"


OMG!!! I really don't believe it!


Are you saying that these are figures that are useful to people who are
"mathematically challenged"? ... Like Rednecks???


Are there people out there who are too stupid to take a running fix????

Not sure what you're grumbling about. These are "shortcuts" and means of
estimating a distance you will be off when abeam of an object and are
all part of and ways of, performing a running fix, with quick math
solutions.
They've been used by many sailors for years .... mayhaps you should try
to learn to use them .... add to your knowledge base, as it were.....

otn

Pocket Pelorus
 

"otnmbrd" wrote in message
nk.net...


Donal wrote:


Are there people out there who are too stupid to take a running fix????

Not sure what you're grumbling about. These are "shortcuts" and means of
estimating a distance you will be off when abeam of an object and are
all part of and ways of, performing a running fix, with quick math
solutions.
They've been used by many sailors for years .... mayhaps you should try
to learn to use them .... add to your knowledge base, as it were.....

I would always double check my calculations anyway(with a proper plot) ....
wouldn't you?

So I wouldn't save any time by using the short cut!!!

It only takes a few seconds to plot a running fix. Why would you bother
with a short cut?


Regards


Donal
--

Pocket Pelorus
 

Donal wrote:


I would always double check my calculations anyway(with a proper plot) ....
wouldn't you?

These are proper plots, part of a running fix, with quick estimates to
back up other parts of your plot and calculations, for distance off
estimates.

So I wouldn't save any time by using the short cut!!!

G The idea is not to save time ....it's to quickly gain some useful
information to back up other aspects of your running fix and especially
useful if you only have the single charted point that you can use to get
your fix.

It only takes a few seconds to plot a running fix. Why would you bother
with a short cut?

It's called "cross checking" or "double checking" ..... most good
navigators use things like this as backup checks on what they are seeing
or doing ..... cost nothing and keeps you busy and focused.

otn

Pocket Pelorus
 

"Donal" wrote in message ...
"otnmbrd" wrote in message
ink.net...


Actually, I find that many in the group are more current and up to
date on many areas of navigation, than I am.

Correct!

And very correct if your talking about
navigation with no external imputs!


Joe
MSV RedCloud





Regards


Donal
--

Pocket Pelorus
 

"Wally" wrote in message ...
Joe wrote:

Im still amazed at wallys answer.

May I ask why?


Sorry Wally, I did not read your second answer.

Joe
MSV RedCloud

Pocket Pelorus
 

Joe wrote:
"Wally" wrote in message
...
Joe wrote:

Im still amazed at wallys answer.

May I ask why?


Sorry Wally, I did not read your second answer.

The second one was just to correct a number.


--
Wally
www.artbywally.com
www.wally.myby.co.uk/music

Pocket Pelorus
 

"Joe" wrote in message
om...
"Donal" wrote in message
...
"otnmbrd" wrote in message
ink.net...

Actually, I find that many in the group are more current and up to
date on many areas of navigation, than I am.

Correct!

And very correct if your talking about
navigation with no external imputs!


How would you know? You've admitted that you wouldn't have a clue how to
navigate without your electronic aids. In fact, you've claimed that it
would be impossible!



Joe
MSV RedMist


Regards


Donal
--

Pocket Pelorus
 

"otnmbrd" wrote in message
ink.net...


Donal wrote:


I would always double check my calculations anyway(with a proper plot)
.....
wouldn't you?

These are proper plots, part of a running fix, with quick estimates to
back up other parts of your plot and calculations, for distance off
estimates.

So I wouldn't save any time by using the short cut!!!

G The idea is not to save time ....it's to quickly gain some useful
information to back up other aspects of your running fix and especially
useful if you only have the single charted point that you can use to get
your fix.

It only takes a few seconds to plot a running fix. Why would you bother
with a short cut?

It's called "cross checking" or "double checking" ..... most good
navigators use things like this as backup checks on what they are seeing
or doing ..... cost nothing and keeps you busy and focused.


Hmmmm!


If you are any good at mental arithmetic, then you should be able to form an
opinion directly from your observation. You will then double check it, by
plotting it on a chart. However, I will conceed that if you are unable to
do basic sums in your head, then you might have to use these short cuts.
I would like to stress that we are *all* able to better at mental arithmetic
than we think.


Regards


Donal
--

Pocket Pelorus
 

Donal wrote:
"otnmbrd" wrote in message
ink.net...


Donal wrote:


I would always double check my calculations anyway(with a proper plot)

....

wouldn't you?

These are proper plots, part of a running fix, with quick estimates to
back up other parts of your plot and calculations, for distance off
estimates.

So I wouldn't save any time by using the short cut!!!

G The idea is not to save time ....it's to quickly gain some useful
information to back up other aspects of your running fix and especially
useful if you only have the single charted point that you can use to get
your fix.

It only takes a few seconds to plot a running fix. Why would you bother
with a short cut?

It's called "cross checking" or "double checking" ..... most good
navigators use things like this as backup checks on what they are seeing
or doing ..... cost nothing and keeps you busy and focused.



Hmmmm!


If you are any good at mental arithmetic, then you should be able to form an
opinion directly from your observation. You will then double check it, by
plotting it on a chart. However, I will conceed that if you are unable to
do basic sums in your head, then you might have to use these short cuts.
I would like to stress that we are *all* able to better at mental arithmetic
than we think.

Three steps to a better Donal the Navigator:

1. Learn what these special case are.
2. Learn how to use them.
3. Go sailing and use them.

Then and only then, come back and we will discuss their merits and
shortcomings. Until then, you are making assumptions based on scanty
information.....afaic, trolling. (I'm ready to lump this with the Rules
nonsense).

otn

Pocket Pelorus
 

If you are any good at mental arithmetic, then you should be able to form an
opinion directly from your observation. You will then double check it, by
plotting it on a chart. However, I will conceed that if you are unable to
do basic sums in your head, then you might have to use these short cuts.
I would like to stress that we are *all* able to better at mental arithmetic
than we think.


Regards


Donal

Using one of these pairs of bearings will give you distance off when
the object is abeam. Combine the distance off with a bearing when
it's abeam and you have a FIX, do you not? Better than a running fix.
Isn't it?
Sorry but I'm new at this coastal navigation stuff.
Mark E. Williams

Pocket Pelorus
 

Maynard G. Krebbs wrote:


Using one of these pairs of bearings will give you distance off when
the object is abeam. Combine the distance off with a bearing when
it's abeam and you have a FIX, do you not? Better than a running fix.
Isn't it?
Sorry but I'm new at this coastal navigation stuff.
Mark E. Williams

The problem with these cases is that set and drift become a factor and
you need a reliable source/ estimate, for speed.
Best bet, is still, multiple bearings on a number of charted points, at
a particular time or point.
All of these methods are tools you can use for verification of other
methods and to narrow the errors which can arise.

otn

Pocket Pelorus
 

"Donal" wrote in message ...
"Joe" wrote in message
om...
"Donal" wrote in message
...
"otnmbrd" wrote in message
ink.net...

Actually, I find that many in the group are more current and up to
date on many areas of navigation, than I am.

Correct!

And very correct if your talking about
navigation with no external imputs!


How would you know? You've admitted that you wouldn't have a clue how to
navigate without your electronic aids. In fact, you've claimed that it
would be impossible!

When did I say any such thing Lanod?

I can navigate 6 different ways that I can think of with a quart of rum in me.
Most likely there are a few others smart ass.
Can ya name six different ways off the top of your pointed little head?
I can.

Joe
MSV RedCloud




Joe
MSV RedMist


Regards


Donal
--

Pocket Pelorus
 

"Maynard G. Krebbs" wrote in message
...

If you are any good at mental arithmetic, then you should be able to form
an
opinion directly from your observation. You will then double check it,
by
plotting it on a chart. However, I will conceed that if you are unable
to
do basic sums in your head, then you might have to use these short cuts.
I would like to stress that we are *all* able to better at mental
arithmetic
than we think.


Regards


Donal

Using one of these pairs of bearings will give you distance off when
the object is abeam. Combine the distance off with a bearing when
it's abeam and you have a FIX, do you not? Better than a running fix.
Isn't it?

Absolutely!

The difficult bit is "the distance off".

If the shoreline is a 200' cliff, and you have Radar, and you are less than
a mile from the shore, then I think that you can probably use the "distance
from shore" measurement with confidence.


Regards


Donal
--




Sorry but I'm new at this coastal navigation stuff.
Mark E. Williams