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Thread: Old no-plotting method for finding Lat and long.
Post: RE: Old no-plotting method for finding Lat and ...
| Greetings.
I agree that ABC tables are easier, but Pub.260 is used so I wanted to suffer the same way as the fellas who are using it. Just kidding. SAintHillaire method is pretty much plo... |
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Rumata |
The Sight Reduction process
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7 |
5,724 |
03-12-2024, 04:45 AM |
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Thread: assumed longitude
Post: RE: assumed longitude
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PeterBPeter, thank you! And no, I don't do it for the exam. I prefer to use tables and , as you've mentioned, need the whole degrees of LHA. And your explanation is good and helpful. Using t... |
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Rumata |
General Topics Here
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2 |
1,426 |
10-07-2023, 10:34 PM |
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Thread: assumed longitude
Post: assumed longitude
| Gentlemen,
Quite recently I've identified little ( maybe ;>) problem, I ignored for a long time. Let me make it short and concise:
Working on LOP for a star. To find LHA to use in Pub.229, vol... |
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Rumata |
General Topics Here
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2 |
1,426 |
10-06-2023, 05:38 PM |
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Thread: LHA in Eastern longitudes?
Post: RE: LHA in Eastern longitudes?
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CelNav57 Wrote: (11-25-2022, 02:30 PM)
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I'm at a loss to understand how to calculate LHA while sailing in Eastern longitudes.
What I know;
LHA in Eastern longitudes= GHA + ApL (Assumed position ... |
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Rumata |
General Topics Here
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5 |
4,135 |
11-25-2022, 07:05 PM |
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Thread: re: relative bearings maybe useful formula
Post: RE: re: relative bearings maybe useful formula
| This simple graph will make it even more easier. If there is a need in the whole idea, of course. ;> ;> |
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Rumata |
General Topics Here
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2,350 |
08-27-2022, 08:08 PM |
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Thread: re: relative bearings maybe useful formula
Post: RE: re: relative bearings maybe useful formula
| Gentlemen, I'm including a very simple TAble ( please, see the Attachment to this message) which helps to use the above mentioned formula . Pretty much it is just two columns of angles., The n... |
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Rumata |
General Topics Here
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2 |
2,350 |
08-26-2022, 12:40 AM |
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Thread: re: relative bearings maybe useful formula
Post: re: relative bearings maybe useful formula
| Gentlemen,
maybe something of an interest for you. I kinda wrote a formula which maybe useful. MAybe;> It can be used to get a running fix from bow and beam relative bearings. It is well-... |
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Rumata |
General Topics Here
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2 |
2,350 |
08-01-2022, 07:04 PM |
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Thread: Old no-plotting method for finding Lat and long.
Post: RE: Old no-plotting method for finding Lat and ...
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BigBill Wrote: (12-19-2021, 03:44 PM)
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Have you had an opportunity to try this yet? How did it go?
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Sorry for a very long delay. Unfortunately the world events ( war in Europe ) to some ex... |
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Rumata |
The Sight Reduction process
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7 |
5,724 |
06-14-2022, 05:52 AM |
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Thread: Sextant - what are these bits for?
Post: RE: Sextant - what are these bits for?
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neil_s Wrote: (01-30-2022, 08:32 PM)
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Hi to all - I am new on the site and a relatively new self taught celestial navigator - I've been hooked for about three years, now. There are a couple of thin... |
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Rumata |
General Topics Here
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6 |
5,565 |
02-02-2022, 06:50 AM |
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Thread: Old no-plotting method for finding Lat and long.
Post: RE: Old no-plotting method for finding Lat and ...
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BigBill Wrote: (12-19-2021, 03:44 PM)
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Have you had an opportunity to try this yet? How did it go?
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Not yet, hopefully soon. Will write about my tryout |
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Rumata |
The Sight Reduction process
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7 |
5,724 |
12-26-2021, 03:27 AM |
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Thread: Article about CN vs GPS.
Post: Article about CN vs GPS.
| Gentlemen, I found this article of a general interest. Admittedly, a lot of stuff you know. But anyway, I found it more read-provoking than listening to MSNBC.
--------------------... |
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Rumata |
General Topics Here
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0 |
1,646 |
12-14-2021, 01:14 AM |
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Thread: Old no-plotting method for finding Lat and long.
Post: RE: Old no-plotting method for finding Lat and ...
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BigBill Wrote: (11-27-2021, 01:43 AM)
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Interesting
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Thank you. I ordered and already got Pub. 260. Will try this method a few times when have more time handy. If so far we can use Pub. 229 an... |
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Rumata |
The Sight Reduction process
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7 |
5,724 |
11-27-2021, 07:35 AM |
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Thread: Old method to find the positions suggested by "Cloudy Weather" Johnson
Post: Old method to find the positions suggested by "Cl...
| Greetings, gentlemen, ( I also posted the same on Sight Reduction thread)
I'm pretty sure that many of you are familiar with the method, old one, which I recently discovered for myself.
... |
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Rumata |
General Topics Here
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1,575 |
05-19-2021, 06:13 AM |
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Thread: Old no-plotting method for finding Lat and long.
Post: Old no-plotting method for finding Lat and long...
| Greetings, gentlemen,
I'm pretty sure that many of you are familiar with the method, old one, which I recently discovered for myself.
I refer to C.A. ("Cloudy Weather" Johnson's "Double Chr... |
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Rumata |
The Sight Reduction process
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7 |
5,724 |
05-17-2021, 11:47 PM |
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Thread: Star of India navigation
Post: RE: Star of India navigation
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pabrides Wrote: (02-18-2021, 05:48 PM)
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Pretty good stuff...
A brief sail aboard Star of India with nav processes explained laymen style.
However, although the cross staff was used as shown looki... |
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Rumata |
General Topics Here
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2 |
3,715 |
02-19-2021, 03:55 AM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| These are scanned images of pages from the old math book. Please, see the attachments. Thanks./ |
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Rumata |
General Topics Here
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11 |
9,369 |
02-13-2021, 05:00 PM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| In Bowditch and Dutton meridional parts explained in a very detailed manner |
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Rumata |
General Topics Here
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11 |
9,369 |
02-12-2021, 03:29 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
| If men would listen to their wives -nobody would ever cross any pond. There is always something to fix in a barn, or leaking toilet. Or wedding anniversary. World history s... |
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Rumata |
General Topics Here
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12 |
10,149 |
02-10-2021, 05:43 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
| He was A French NAvy doctor. Young. He analyzed alot of shipwrecking stories and came to the conclusion that people on open seas died mainly of fear. Not of lack of water and... |
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Rumata |
General Topics Here
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12 |
10,149 |
02-10-2021, 04:41 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
| Alain Bombard did it in reality. And without bottled freshwater and food crossed Atlantic. |
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Rumata |
General Topics Here
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12 |
10,149 |
02-09-2021, 05:53 PM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Greetings,
As I've wrote, I will scan a few pages of the books just mentioned above. If anyone has any interest in more scanned pages-please, let me know. Again, it is kind of ... |
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Rumata |
General Topics Here
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11 |
9,369 |
02-09-2021, 03:42 AM |
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Thread: Apparent time
Post: RE: Apparent time
| Thank you, Paul. Will follow. Re: UPS. Tried a few times to construct a specific area of a chart using meridional parts method. It is much more precise and a lot of headache w... |
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Rumata |
General Topics Here
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3 |
3,284 |
02-05-2021, 05:07 PM |
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Thread: Apparent time
Post: Apparent time
| Gentlemen, hope you can help me in this little "predicament."
At first , a few general terms:
1. Apparent time is a measure of the sun' true position. To get Greenwich apparent ... |
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Rumata |
General Topics Here
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3 |
3,284 |
02-05-2021, 03:18 AM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Thank you.
You are right., i can't imagine anyone using a caliper , even micrometer, to get more than two decimal. Yes, one may get it and what? To boast about it to a first ... |
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Rumata |
General Topics Here
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11 |
9,369 |
02-03-2021, 05:49 PM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Of course, I do believe that slide ruler can be customized to any size of inner pocket or a briefcase. Sir Winston' technical adviser always had one slide ruler in his pocket... |
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Rumata |
General Topics Here
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11 |
9,369 |
02-03-2021, 06:53 AM |
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Thread: Curious old navy math techniques.
Post: RE: Curious old navy math techniques.
| Thanks for the response. Yes, I know, that that price for that particular slide ruler meant it belonged to Captain James Cook or Professor E. Fermi. At least. One of the best ... |
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Rumata |
General Topics Here
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11 |
9,369 |
02-03-2021, 04:48 AM |
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Thread: Curious old navy math techniques.
Post: Curious old navy math techniques.
| Greetings, gentlemen. I found a couple of interesting old books which, considering lockdowns and general inability to cross a street without damn mask, may help to develop not ver... |
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Rumata |
General Topics Here
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11 |
9,369 |
02-03-2021, 02:48 AM |
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Thread: North Magnetic Pole just crossed Prime Meridian
Post: RE: North Magnetic Pole just crossed Prime Meridia...
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Fred_B Wrote: (12-22-2019, 03:37 AM)
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Rumata,
That's a very interesting post. The explanation of GPS is something that always has confused me, now, it makes more sense.
As to the earth's ma... |
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Rumata |
The Sight Reduction process
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7 |
7,921 |
12-22-2019, 09:42 PM |
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Thread: North Magnetic Pole just crossed Prime Meridian
Post: North Magnetic Pole just crossed Prime Meridian
| Gentlemen, I found the following piece kind of interesting.
Earth's magnetic north pole, which has been wandering faster than expected in recent years, has now crossed the prime meridian (https://... |
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Rumata |
The Sight Reduction process
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7 |
7,921 |
12-17-2019, 06:18 AM |
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Thread: 2017 Bowditch- The American Practical Navigator
Post: RE: 2017 Bowditch- The American Practical Navigato...
| Thanks, CelNav57.
In addition to better format I also found that it corrected some errors , especially in examples re: apparent and true wind vectors. It is always good to know that someone reall... |
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Rumata |
General Topics Here
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3 |
6,239 |
12-12-2019, 07:13 AM |
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Thread: 1940 book for navy cadets. Good refresher of trig.
Post: 1940 book for navy cadets. Good refresher of trig...
| Gentlemen, found an old 1940 book US Naval Academy, Plane and Spherical Trigonometry , by Kells, Kern, and Bland. Admittedly, majority of the book is trig and exercises, but there are a few spher... |
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Rumata |
General Topics Here
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0 |
2,735 |
12-12-2019, 03:47 AM |
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Thread: The North Pole no longer wanders - it runs
Post: RE: The North Pole no longer wanders - it runs
| I can't guarantee the reliability or trustfulness of the source. But I'm respectfully disagree that this article is alarmist nonsense. Without entering in the fruitless discussion ( as you correct... |
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Rumata |
The Sight Reduction process
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7 |
10,704 |
09-03-2019, 06:01 PM |
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Thread: Assumed Position: adjustment necessary when using calculator?
Post: RE: Assumed Position: adjustment necessary when u...
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Stearmandriver Wrote: (05-08-2019, 05:59 AM)
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Hello all!
Great forum here. I've been browsing and learning for a week; as esoteric as it might be these days, it's nice to have a dedicated place... |
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Rumata |
The Sight Reduction process
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4 |
6,158 |
05-11-2019, 01:48 AM |
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Thread: Small error in Chapman
Post: Small error in Chapman
| Gentlemen.
just found a small error in 1966 Chapman. But then found out it was corrected in 1974 ed. Just for info:
Concerning the usage of maneuvering board. page 430b in 1966 edition. It is ... |
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Rumata |
General Topics Here
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0 |
2,921 |
03-21-2019, 05:54 AM |
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Thread: The North Pole no longer wanders - it runs
Post: RE: The North Pole no longer wanders - it runs
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c_davidson Wrote: (02-19-2019, 01:52 AM)
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Nice work Rumata. Interesting, isn't it, that the magnetic pole is getting closer to Polar North. That the earth is one huge electro-magnet is astounding... |
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Rumata |
The Sight Reduction process
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7 |
10,704 |
02-19-2019, 07:52 PM |
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Thread: The North Pole no longer wanders - it runs
Post: RE: The North Pole no longer wanders - it runs
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Fred_B Wrote: (02-09-2019, 01:30 AM)
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This is fascinating! Part of Amundsen's Northwest Passage expedition (1903-1906) was to find the position of the Magnetic North Pole in which they were succes... |
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Rumata |
The Sight Reduction process
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7 |
10,704 |
02-09-2019, 07:30 PM |
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Thread: The North Pole no longer wanders - it runs
Post: The North Pole no longer wanders - it runs
| Gentlemen, below is the translation from German into English of some interesting fact. Hope, you will find it useful. The translation of the article in the following post was done by Google, theref... |
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Rumata |
The Sight Reduction process
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7 |
10,704 |
01-30-2019, 07:18 AM |
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Thread: Last time
Post: RE: Last time
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pabrides Wrote: (11-26-2018, 05:32 AM)
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Hi Shipmates,
I've got some more practice data for you. I've calculated it already; it provides acceptable accuracy: +- 2 miles
Point one: For the ... |
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Rumata |
The Sight Reduction process
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2 |
4,565 |
11-27-2018, 12:26 AM |
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Thread: Lesson learned
Post: RE: Lesson learned
| Gentlemen, one more lesson learned ( on my side, of course) . Usage of the Publications 229 or 249 of a non-current (outdated) epoch will noticeably affect the value of Hc. Not too much Z or Zn. A... |
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Rumata |
The Sight Reduction process
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3 |
5,863 |
11-15-2018, 02:16 AM |
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Thread: Lesson learned
Post: RE: Lesson learned
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pabrides Wrote: (10-21-2018, 09:55 AM)
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Rumata Wrote: (10-21-2018, 06:47 AM)
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Greetings,
Am pretty sure me only had that kind of a problem in calcs, but, anyway, let me share it with you. Ju... |
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Rumata |
The Sight Reduction process
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3 |
5,863 |
10-21-2018, 07:37 PM |
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Thread: Lesson learned
Post: Lesson learned
| Greetings,
Am pretty sure me only had that kind of a problem in calcs, but, anyway, let me share it with you. Just in case.
Using intercept method. Getting wrong fixes . Checked anything a few... |
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Rumata |
The Sight Reduction process
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3 |
5,863 |
10-21-2018, 06:47 AM |
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Thread: Interpolation in Pub.229
Post: RE: Interpolation in Pub.229
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pabrides Wrote: (07-18-2018, 03:54 AM)
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Sooooooo, I just finished the averaging of the sun and moon shots and plotted the same. I came within a quarter mile of the true position. So that was the ... |
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Rumata |
The Sight Reduction process
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14 |
18,544 |
07-18-2018, 04:11 AM |
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Thread: Interpolation in Pub.229
Post: RE: Interpolation in Pub.229
| Joe, thank you. Yes, this small problem is a little bit tricky. If you would use all the shots , then you would get kind of ambiguous fix. And I'm wondering: if I wouldn't know the right answer, I wou... |
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Rumata |
The Sight Reduction process
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14 |
18,544 |
07-17-2018, 04:23 PM |
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Thread: Interpolation in Pub.229
Post: RE: Interpolation in Pub.229
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pabrides Wrote: (07-17-2018, 05:29 AM)
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Rumata Wrote: (07-17-2018, 01:35 AM)
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pabrides Wrote: (07-16-2018, 11:30 PM)
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Rumata Wrote: (07-16-2018, 05:27 PM)
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pabrides Wrote: (07-16-2018, 09... |
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Rumata |
The Sight Reduction process
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14 |
18,544 |
07-17-2018, 06:17 AM |
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Thread: Interpolation in Pub.229
Post: RE: Interpolation in Pub.229
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pabrides Wrote: (07-16-2018, 11:30 PM)
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Rumata Wrote: (07-16-2018, 05:27 PM)
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pabrides Wrote: (07-16-2018, 09:32 AM)
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Rumata Wrote: (07-16-2018, 06:11 AM)
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pabrides Wrote: (07-16-2018, 03... |
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Rumata |
The Sight Reduction process
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14 |
18,544 |
07-17-2018, 01:35 AM |
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Thread: Interpolation in Pub.229
Post: RE: Interpolation in Pub.229
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pabrides Wrote: (07-16-2018, 09:32 AM)
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Rumata Wrote: (07-16-2018, 06:11 AM)
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pabrides Wrote: (07-16-2018, 03:08 AM)
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Rumata Wrote: (07-16-2018, 02:03 AM)
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Gentlemen,
In a pretty routin... |
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Rumata |
The Sight Reduction process
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14 |
18,544 |
07-16-2018, 05:27 PM |
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Thread: Interpolation in Pub.229
Post: RE: Interpolation in Pub.229
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pabrides Wrote: (07-16-2018, 03:08 AM)
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Rumata Wrote: (07-16-2018, 02:03 AM)
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Gentlemen,
In a pretty routine calculation I faced a problem which forced me to redo that calc three times. Let m... |
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Rumata |
The Sight Reduction process
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14 |
18,544 |
07-16-2018, 06:11 AM |
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Thread: Interpolation in Pub.229
Post: Interpolation in Pub.229
| Gentlemen,
In a pretty routine calculation I faced a problem which forced me to redo that calc three times. Let me explain myself:
Three sighting of Sun and three sightings of Moon. Regular fix. Sup... |
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Rumata |
The Sight Reduction process
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14 |
18,544 |
07-16-2018, 02:03 AM |
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Thread: LOP plotting question
Post: RE: LOP plotting question
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pabrides Wrote: (06-29-2018, 11:25 PM)
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Rumata Wrote: (06-29-2018, 05:55 PM)
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BigBill Wrote: (06-29-2018, 02:35 PM)
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Diagrams would sure help in a discussion like this. :)
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Big Bill, just ... |
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Rumata |
General Topics Here
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11 |
14,485 |
06-30-2018, 12:22 AM |
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Thread: LOP plotting question
Post: RE: LOP plotting question
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BigBill Wrote: (06-29-2018, 02:35 PM)
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Diagrams would sure help in a discussion like this. :)
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Big Bill, just attached the scan |
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Rumata |
General Topics Here
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11 |
14,485 |
06-29-2018, 05:55 PM |
