|
Search Results
|
| Post |
Author |
Forum |
Replies |
Views |
Posted
[asc]
|
| |
|
Thread: What Is Your Favorite Watch?
Post: RE: What Is Your Favorite Watch?
| Now that's a handsome watch! Casio makes good watches. Many years ago, I think it was in the 1980's, I had a Casio that had an LCD analog display. Here it is- https://www.youtube.com/watch?v=oK3ixE... |
|
Fred_B |
Equipment- Wanted or for Sale
|
3 |
2,306 |
08-25-2023, 10:59 AM |
| |
|
Thread: USCG Crazy Exam question: Sidereal vs Tropical Year
Post: RE: USCG Crazy Exam question: Sidereal vs Tropical...
| Peter,
Not knowing if this'll help. Consider this, Aries moves 15.041° per hour.
Just an idea.
Fred |
|
Fred_B |
General Topics Here
|
3 |
2,422 |
05-05-2023, 09:48 PM |
| |
|
Thread: How to get LHA and Ap longitude in Eastern longitudes
Post: RE: How to get LHA and Ap longitude in Eastern lon...
| PeterB,
That makes perfect sense and I now understand that it's a good idea to have a shorter intercept for practical reasons. Of course, getting the correct answer on an exam is more consistent w... |
|
Fred_B |
General Topics Here
|
15 |
7,552 |
04-29-2023, 11:16 AM |
| |
|
Thread: How to get LHA and Ap longitude in Eastern longitudes
Post: RE: How to get LHA and Ap longitude in Eastern lon...
| This is a very interesting topic and I've enjoyed watching the development of it, especially as PeterB explains the procedure.
For curiosities sake, I have several questions related to determining ... |
|
Fred_B |
General Topics Here
|
15 |
7,552 |
04-28-2023, 04:21 PM |
| |
|
Thread: North Magnetic Pole just crossed Prime Meridian
Post: RE: North Magnetic Pole just crossed Prime Meridia...
| Had no idea the magnetic pole moved that much. Speaking of compasses- compasses that are useful in one hemisphere (Northern or Southern) are useless in another....from what I've heard.
Fred |
|
Fred_B |
The Sight Reduction process
|
7 |
7,876 |
02-12-2021, 01:19 AM |
| |
|
Thread: NO ATHEISTS IN A STORM
Post: RE: NO ATHEISTS IN A STORM
|
pabrides Wrote: (02-11-2021, 06:07 AM)
--
Just Like the lack of atheism in foxholes, there are no atheists in a storm at sea.
No one knows this better than the author of THE SQUARE RIGGED CRUISE... |
|
Fred_B |
General Topics Here
|
2 |
3,455 |
02-12-2021, 01:06 AM |
| |
|
Thread: Navigation and other Marine Applications for SRs
Post: RE: Navigation and other Marine Applications for S...
| I have 2 of them and still use them. It's often easier to use a sr to see various answers quickly or approximate comparisons. Sight Reductions can be done but there's a need to be very careful since... |
|
Fred_B |
General Topics Here
|
3 |
3,825 |
01-04-2021, 01:30 PM |
| |
|
Thread: Covid shots
Post: RE: Covid shots
| pabrides,
Yes, have been doing more cn than usual.
The times since March haven't been good at all for most of us. A lot of unemployment and the destruction throughout the cities and the econo... |
|
Fred_B |
The Sight Reduction process
|
7 |
5,910 |
12-22-2020, 11:40 PM |
| |
|
Thread: Celestial Nav problem I can't solve
Post: RE: Celestial Nav problem I can't solve
| Ray,
We've got to figure out the correct date- is it January 15 or January 16, 1981. The local date at E 163° is January 16, 1981. Greenwich date is January 15, 1981. At least I'm pretty sure it... |
|
Fred_B |
General Topics Here
|
12 |
13,489 |
04-29-2020, 10:42 PM |
| |
|
Thread: Celestial Nav problem I can't solve
Post: RE: Celestial Nav problem I can't solve
| Ray,
Here's a quick comment which might initially help getting the correct Ho. The IE is +2.3' which means "it's on the arc" so you "take it off". That is- subtract that figure from Hs. In your ... |
|
Fred_B |
General Topics Here
|
12 |
13,489 |
04-29-2020, 10:25 PM |
| |
|
Thread: North Magnetic Pole just crossed Prime Meridian
Post: RE: North Magnetic Pole just crossed Prime Meridia...
| 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 magnetic pole shifting- yes, it's speeding ... |
|
Fred_B |
The Sight Reduction process
|
7 |
7,876 |
12-22-2019, 03:37 AM |
| |
|
Thread: The North Pole no longer wanders - it runs
Post: RE: The North Pole no longer wanders - it runs
| 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 successful- near Boothia Peninsula. It had bee... |
|
Fred_B |
The Sight Reduction process
|
7 |
10,647 |
02-09-2019, 01:30 AM |
| |
|
Thread: Compasses vs Sextants
Post: Compasses vs Sextants
| Found this funny captioned picture.
Good idea.
Fred |
|
Fred_B |
Humor & Laughter
|
0 |
2,693 |
08-31-2018, 12:09 AM |
| |
|
Thread: Index correction
Post: RE: Index correction
| Joe,
The link requires "allow notifications". Anyway around that?
Fred |
|
Fred_B |
General Topics Here
|
2 |
5,010 |
08-20-2018, 10:07 AM |
| |
|
Thread: LONGITUDE
Post: RE: LONGITUDE
| Good questions!
Harrison was very "wordy" and in one of the pamphlets he wrote the first sentence was 35 pages long.
What makes me pull out the remaining hair I have is the perpetual statement o... |
|
Fred_B |
General Topics Here
|
6 |
8,673 |
07-09-2018, 10:44 AM |
| |
|
Thread: Doesn't matter which row or column in Table 5?
Post: RE: Doesn't matter which row or column in Table 5?
| Joe,
"the minutes symbol would indicate the vertical numbers are minutes of declination past the hour."
The ' (minutes symbol) is only the minutes of declination for, let's say, the Sun (or any ... |
|
Fred_B |
The Sight Reduction process
|
7 |
10,458 |
07-09-2018, 10:36 AM |
| |
|
Thread: Mars and venus
Post: RE: Mars and venus
| Joe,
Practically, there's no need to correct for HP when using Venus or Mars. However, they do have a sensible diameter, like the moon. If you're inclined to get even better accuracy correct for ... |
|
Fred_B |
The Sight Reduction process
|
2 |
4,153 |
07-04-2018, 10:24 AM |
| |
|
Thread: LOP plotting question
Post: RE: LOP plotting question
| Rumata,
Can you explain what that means?
Thanks,
Fred |
|
Fred_B |
General Topics Here
|
11 |
14,438 |
06-29-2018, 10:06 AM |
| |
|
Thread: Gunter and Bowditch
Post: RE: Gunter and Bowditch
| No batteries! Now that's the way to be! Analog!
I was reading in Amundsen's book, "The South Pole"
Get it here- https://www.thenauticalalmanac.com/books.html
...that First Lt. Thorvald Nilsen led... |
|
Fred_B |
General Topics Here
|
6 |
12,214 |
06-12-2018, 01:31 AM |
| |
|
Thread: Current users list
Post: RE: Current users list
| So true!
I only use StartPage.com |
|
Fred_B |
Humor & Laughter
|
3 |
5,133 |
06-12-2018, 12:26 AM |
| |
|
Thread: Plotting Tools
Post: Plotting Tools
| What tools do you use when plotting?
Parallel rules?
Rolling Plotter?
Dividers?
Triangles?
Simple ruler? (like BigBill uses here- https://youtu.be/gucO6eVtwVo?t=13m2s
...or just goo... |
|
Fred_B |
General Topics Here
|
1 |
4,121 |
03-14-2018, 09:27 PM |
| |
|
Thread: Buy a sextant
Post: RE: Buy a sextant
| Somebody mentioned it doesn't rust. Now that is good!
Have you guys tried using it without the "telescope". |
|
Fred_B |
General Topics Here
|
14 |
34,342 |
03-21-2017, 12:43 PM |
| |
|
Thread: Stellarium- finding stars
Post: RE: Stellarium- finding stars
| Have you seen the the plugin for the navigational stars?
http://www.stellarium.org/wiki/index.php/Navigational_Stars_plugin
Fred |
|
Fred_B |
General Topics Here
|
11 |
19,611 |
03-13-2017, 11:08 AM |
| |
|
Thread: The minimum of paper to carry?
Post: The minimum of paper to carry?
| We don't want to lug around more paper than necessary.
For celnav work what have you found to be the minimum amount of paper or documents you need with you to carry out a sight reduction and plot?
F... |
|
Fred_B |
General Topics Here
|
1 |
5,141 |
02-08-2017, 02:03 PM |
| |
|
Thread: Co-Latitude
Post: RE: Co-Latitude
| Co-latitude, from wikipedia, https://en.wikipedia.org/wiki/Colatitude
The colatitude is most useful in astronomy because it refers to the zenith distance of the celestial poles. For example, at l... |
|
Fred_B |
General Topics Here
|
2 |
9,327 |
03-24-2016, 01:27 AM |
| |
|
Thread: Who bothers with Noon sights, and why?
Post: RE: Who bothers with Noon sights, and why?
| We don't actively attempt a Noon-sight except for occasional curiosity and tradition.
If it happens that I'm taking a sight and it occurs just at LAN then I'm happy. That's very rare.
Now if we... |
|
Fred_B |
The Sight Reduction process
|
2 |
7,349 |
03-04-2016, 12:58 PM |
| |
|
Thread: Does anyone really shoot the Moon?
Post: RE: Does anyone really shoot the Moon?
|
jeremyparker Wrote: (02-26-2016, 11:56 PM)
--
Moon shots:
The moon is tricky to shoot and to reduce correctly - why? It's big and bright and easy to identify, but it jiggers about, so hour angle and... |
|
Fred_B |
The Sight Reduction process
|
8 |
15,861 |
02-27-2016, 02:20 AM |
| |
|
Thread: Doniol- Sight reduction
Post: RE: Doniol- Sight reduction
| Speaking of "no batteries required", has anyone considered using a slide rule?
Fred |
|
Fred_B |
The Sight Reduction process
|
7 |
13,914 |
02-03-2016, 05:16 PM |
| |
|
Thread: Davis Mark 15 sextant- wanted
Post: RE: Wanted- Davis Mark 15 sextant
|
LouisC Wrote: (02-03-2016, 03:22 PM)
--
The Mark 15 is ok. Not super accurate but good for learning the art and it won't rust.
--
Another good thing about the Mark 15 is it's light. |
|
Fred_B |
Equipment- Wanted or for Sale
|
4 |
10,753 |
02-03-2016, 03:43 PM |
| |
|
Thread: What kind of boat do you have?
Post: RE: What kind of boat do you have?
|
Hydra Wrote: (02-01-2016, 06:37 PM)
--
I have a Gib'Sea 302.
Location: Lorient, Brittany
Alain
--
Alain,
That's a nice boat- beautiful shape. I assume you have a sugar scoop.
Welcome,... |
|
Fred_B |
General Topics Here
|
3 |
7,920 |
02-02-2016, 10:12 PM |
| |
|
Thread: Doniol- Sight reduction
Post: RE: Doniol- Sight reduction
| Yes, I'm up for it. The haversine tables I got off the web somewhere last year. Bowditch 1972 vol. 2 has 'em also. You have to buy the 1972 edition now. Confound it.
Unless I'm in error the onl... |
|
Fred_B |
The Sight Reduction process
|
7 |
13,914 |
01-14-2016, 11:58 PM |
| |
|
Thread: Altitude correction, Sun, with reflecting artificial horizon
Post: RE: Altitude correction, Sun, with reflecting arti...
|
stargazer Wrote: (01-05-2016, 01:46 AM)
--
The sun has a large apparent disc covering a big area. The lower limb has more atmospheric refractive bending than the upper limb. By the way, the bent ligh... |
|
Fred_B |
General Topics Here
|
9 |
24,198 |
01-05-2016, 08:46 PM |
| |
|
Thread: Venus magnitude -4.0
Post: RE: Venus magnitud -4.0
| Have been trying to shoot Venus but it has been too cloudy. When you want to shoot a planet or a star and are excited to do it the wx often gets bad.
Did you guys watch the occultation of Venus ... |
|
Fred_B |
The Sight Reduction process
|
11 |
21,251 |
12-18-2015, 02:03 AM |
| |
|
Thread: Venus magnitude -4.0
Post: RE: Venus magnitud -4.0
|
stargazer Wrote: (12-17-2015, 04:00 PM)
--
I'm relatively ignorant about celestial navigation but I understand the major motions of the celestial bodies fairly well. So here is my best guess of what... |
|
Fred_B |
The Sight Reduction process
|
11 |
21,251 |
12-17-2015, 07:13 PM |
| |
|
Thread: No Pub. No. 229
Post: RE: No HO-229
| How fast in getting Hc and Z?
Probably about 1 minute if being cautious and pressing the right buttons.
The calculator makes for an easy entry. Casio, perfect for what these purposes. |
|
Fred_B |
General Topics Here
|
2 |
6,251 |
12-16-2015, 10:28 PM |
| |
|
Thread: No Pub. No. 229
Post: No Pub. No. 229
| Pub. No. 229 is way too cumbersome to lug around so I solve for Hc and Zn using the respective formulae for them.
These are handy to carry- http://thenauticalalmanac.com/Formulas.html
and a lot ... |
|
Fred_B |
General Topics Here
|
2 |
6,251 |
12-16-2015, 05:34 PM |
| |
|
Thread: On the sea while on the hard
Post: On the sea while on the hard
| Standing on a beach on the East coast of the US is good practice for sights made while on the ocean. Except one big problem- SAND!! It teaches you a new regard for keeping the sextant clean.
Has a... |
|
Fred_B |
General Topics Here
|
1 |
5,869 |
12-16-2015, 05:29 PM |
| |
|
Thread: Limb to use- Upper or Lower?
Post: Limb to use- Upper or Lower?
| When using an AH it seems the Lower Limb shots are the ones I usually make because I can add quicker than subtract when using the Altitude Correction Tables. If the LL isn't available then the Upper ... |
|
Fred_B |
The Sight Reduction process
|
11 |
18,994 |
12-16-2015, 05:26 PM |
| |
|
Thread: Small t-square
Post: Small t-square
| For plotting I use mini-parallel rules and a small t-plotter from some scrap plexiglas. Works good.
F. |
|
Fred_B |
General Topics Here
|
0 |
3,066 |
12-15-2015, 02:30 AM |
| |
|
Thread: CelNav again at USNA
Post: CelNav again at USNA
| Hey, looks like the Naval academy is going to teach CelNav.
Surprise surprise! |
|
Fred_B |
General Topics Here
|
1 |
5,209 |
12-15-2015, 02:28 AM |
| |
|
Thread: Writing down sights
Post: RE: Writing down sights
| Index cards are about the best I can come up with. Tried a notebook, paper, but didn't work too well.
Use pencils are my favorite, the mechanical type.
Is there a spell checker on this forum?
... |
|
Fred_B |
The Sight Reduction process
|
2 |
5,089 |
12-15-2015, 02:26 AM |
| |
|
Thread: Pencil or pens- which to use
Post: Pencil or pens- which to use
| New member here.
Which do you prefer to use during CelNav work- a pencil or a pen?
Me? A #2 mechanical pencil from Walmart.
Cheap replacement lead can be bought at DollarTree.
Good stuff.... |
|
Fred_B |
The Sight Reduction process
|
4 |
10,134 |
12-15-2015, 02:23 AM |
