Forums - Search Results

2,467

02-17-2021, 03:45 PM

Thread: Covid shots
Post: RE: Covid shots

So you figured it out! Good. Here's another idea I've wondered about; When using an AH, what effect does any glass have on the Hs? Example- you're using a dish of water for an AH on a wind...

5,910

12-26-2020, 01:12 AM

Thread: Bagnold Sun compass- BillOfTheNorth
Post: Bagnold Sun compass- BillOfTheNorth

Bill, Your video about the Bagnold Sun compass is fascinating! Your desert attire is perfect! https://www.youtube.com/watch?v=N-YvH_dUW44 Perhaps because it's so simple to understand....I ca...

4,061

05-24-2019, 11:34 PM

Thread: What Time is it?
Post: RE: What Time is it?

Fellas, I forgot to mention the time signals at 2.5 mHz, 5 mHz, 10 mHz, 15 mHz and 20 mHz (WWV) There's also WWVH (Hawaii). I you look in The Nautical Almanacs found on this site you'll see on...

24,770

10-02-2018, 12:43 AM

Thread: What Time is it?
Post: RE: What Time is it?

That's a good question, Joe. We have one of those "atomic clocks" on the wall and I compare my watch to it. Sometimes I'll call NIST (WWV) and get the time- 303-499-7111 The USNO has it's "master...

24,770

09-29-2018, 11:14 AM

Thread: Nories tables?
Post: RE: Nories tables?

BigBill, Yes, I'm familiar with them though I've never tried them. Like Doniol many swear by them and others swear at them. Though not certain you might be able to find them over at; http://...

6,215

09-08-2018, 12:58 AM

Thread: Calculator method
Post: RE: Calculator method

Joe, Take a look at these formulas- they're the same but may be of some help; https://thenauticalalmanac.com/Formulas.html Roland

8,377

07-19-2018, 12:09 PM

Thread: Table 4
Post: RE: Table 4

CN has devolved into something too technical more based on "why-it-works-this-way" instead of "how". I've spent too much time studying Table 4. The explanation CelNav wrote makes it a very easy pr...

4,976

07-11-2018, 10:42 PM

Thread: Minimum equipment list
Post: RE: Minimum equipment list

Joe, You're right- I forgot charts. A gnomonic would be a good idea or just a Mercator to mark the course traveled. An electronic knot meter might be best instead of a Log (thrown overboard and r...

6,879

06-25-2018, 07:27 PM

Thread: Minimum equipment list
Post: RE: Minimum equipment list

Joe, I love this kind of question and the statements you made. Road map?! Wow! Now THERE'S and adventurer!!! Lunar method would be the end of my cel nav work and it's certain it would burn me...

6,879

06-23-2018, 10:17 PM

Thread: Sextant wanted and other questions
Post: RE: Sextant wanted and other questions

Joe, As to your question number 2: HP is particular to Moon observations. Using the Altitude Correction for the Moon here- https://thenauticalalmanac.com/Altitude%20Correction%20Tables%20for%20the%2...

Equipment- Wanted or for Sale

9,172

06-08-2018, 12:44 PM

Thread: AP in the east.
Post: RE: AP in the east.

Now that's just great! I had failed to consider the DR positions when I plotted the LOPs. Bob, this has been a very helpful lesson on your part. Thank you for the effort. Now....finally...I c...

19,536

03-11-2018, 03:04 AM

Thread: AP in the east.
Post: RE: AP in the east.

Like Rumata did so neatly, I should've written out the reduction clearly. I used Ho-249. Here's the readable reduction; Sight 1 2/17/2018 GMT 12:18:50 GHA- 1° 12.8' LHA- 017° Declin...

19,536

03-06-2018, 09:05 PM

Thread: AP in the east.
Post: RE: AP in the east.

Bob, I did the sun sight reduction and plotted the Lines of Position. See the attached reduction sheet and plot. Sorry about the poor quality. I used HO-249 Latitude 38°. Something tells me I...

19,536

03-05-2018, 08:44 PM

Thread: AP in the east.
Post: RE: AP in the east.

Bob, Also, are the Ap. longitude figures correct that I provided? Thank you, Roland

19,536

03-05-2018, 02:52 PM

Thread: AP in the east.
Post: RE: AP in the east.

As an exercise please reduce and plot the following to check the different Ap formulas discussed above. In this case the daily running sun fix was within 2 miles of the DR positions. 17 Feb 2018 (...

19,536

03-05-2018, 01:15 PM

Thread: Filters
Post: RE: Filters

That's a very good question since most sights we take are of the Sun. There's no information that I could find about my Astra III-B. That said, it appears that regular glass will filter out UV prett...

9,331

02-17-2018, 09:51 PM

Thread: Just trying to be nice
Post: RE: Just trying to be nice

Here here! Hopefully 2018 will be a better year than 2017. It's great to be getting older- so much techno-stuff has come and gone, gotten smaller, faster, more precise and still most people have no ...

6,264

12-23-2017, 01:13 PM

Thread: A,B, P etc
Post: RE: A,B, P etc

BigBill Wrote: (11-12-2017, 04:35 PM) -- Does anyone know or have a link that explains what exactly the values for A,B, F, P etc represent in a sight reduction? I was asked recently and I know an...

9,489

11-14-2017, 11:51 PM

Thread: Desperate Voyage
Post: RE: Desperate Voyage

I read Desperate Voyage quite a while ago and enjoyed it. His courage and persistence were phenomenal. I've wondered why he was always trying to harpoon the biggest, baddest creatures of the deep? ...

6,611

10-16-2017, 08:25 PM

Thread: Electronic Sextant G-Stell
Post: RE: Electronic Sextant G-Stell

BigBill, "Point and shoot" stuff sounds easy to use, and probably is, but sailing at 5 knots it doesn't matter much how fast I get an LOP. The reduction using paper is easy, fun and the only elect...

7,533

07-11-2017, 10:15 AM

Thread: Doesn't matter which row or column in Table 5?
Post: RE: Doesn't matter which row or column in Table 5?

Ed & Rumata, Table 5 in Pub. No. 249 gave me the same results you're describing. Thanks to Rumata, Pub. No. 229 gives the basic formula as seen below. After running a few examples through the...

10,458

06-13-2017, 10:29 AM

Thread: Why Polaris isn't listed?
Post: RE: Why Polaris isn't listed?

Rumata- Working with paper is more enjoyable than electronics but lugging around Pub. 229 wouldn't be so bad if I considered that, no, I'm probably not going to sail around the world so all volumes a...

22,321

04-22-2017, 10:55 AM

Thread: Moon alt correction with AH
Post: RE: Moon alt correction with AH

Bill, What's nice about the St.Hilaire method is that no matter which Ap Longitude or Latitude you use you will get the LOP where it's supposed to be. Roland

6,524

04-05-2017, 08:42 PM

Thread: Moon alt correction with AH
Post: RE: Moon alt correction with AH

BigBill, I think you are correct. However, what has me puzzled is the Moon Altitude correction table tells you to take the average of the upper and lower limb shots and then subtract 0° 15' which I a...

6,524

04-05-2017, 06:29 PM

Thread: Lego Sextant
Post: RE: Lego Sextant

There's someone selling a bunch of the Lego sextants on Etsy as ear rings. Who says celnav is dead?

7,742

04-01-2017, 11:14 AM

Thread: Beaufort scale
Post: RE: Beaufort scale

Many are the words I've read where mariners say, "you have no idea of the tremendous power of the ocean and the wx until you get hit by it".

Marine Weather

9,366

03-21-2017, 11:47 AM

Thread: Theodolite
Post: RE: Theodolite

BigBill Wrote: (03-11-2017, 02:25 PM) -- Thanks for the swift replies. Can you tell me how fine a sighting is possible with one of these? I've seen many that can't do better than 15' though maybe t...

10,290

03-11-2017, 11:56 PM

Thread: Theodolite
Post: RE: Theodolite

BigBill Wrote: (03-11-2017, 04:20 AM) -- Hi, New guy here. I'm more of a land navigator with the sextants and was wondering if anyone had any experience or ideas about a make and model of surveyor...

10,290

03-11-2017, 12:06 PM

Thread: The minimum of paper to carry?
Post: RE: The minimum of paper to carry?

Fred_B Wrote: (02-08-2017, 02:03 PM) -- 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 ...

5,140

02-11-2017, 01:43 AM

Thread: Buy a sextant
Post: RE: Buy a sextant

Can you tell us what SNO-T stands for? It probably has provided some laughs for a name in English speaking countries. Thanks for the excellent photos of your pocket sextant. They have always been...

34,342

01-21-2017, 12:24 PM

Thread: What time is Spring, exactly?
Post: RE: What time is Spring, exactly?

Great minds thinks alike; March 20, 2016 at UT 04:30:08.325 Roland

4,973

03-19-2016, 11:14 PM

Thread: Davis Mark 15 sextant- wanted
Post: RE: Wanted- Davis Mark 15 sextant

P.Rutherford Wrote: (02-03-2016, 02:49 PM) -- Does anyone have a Davis Mark 15 sextant they want to sell? Paul -- Paul, Albyreto has a Davis Mark 15. Albyreto Davis Mark 15 (https://...

Equipment- Wanted or for Sale

10,752

02-03-2016, 03:06 PM

Thread: Going blind
Post: Going blind

Why is the print so small on both Pub. 249 and HO-229? All of the print in sextant work is small. I tell you I'm going blind!!! Roland

3,130

12-26-2015, 01:30 PM

Thread: CelNav- no batteries, no electronics but...
Post: RE: CelNav- no batteries, no electronics but...

For me the notion of not knowing what time it is or not be able to ascertain the time is a "dooms-day" scenario. However, relying upon a chronometer or watch is a weak link in the celestial navigatio...

7,468

12-26-2015, 01:27 PM

Thread: Limb to use- Upper or Lower?
Post: RE: Limb to use- Upper or Lower?

Fred_B Wrote: (12-16-2015, 05:26 PM) -- Do any of you shoot super-imposed? If so, why do you use it? FB. -- Fred, I shot the cloud obscured Sun super-imposed yesterday at around UT 16:32 and...

18,994

12-26-2015, 01:21 PM

Thread: No new sextant
Post: No new sextant

To my surprise I got no new astro-nav equipment for Christmas. The Seahorse hardcase I asked for didn't come down the chimney! Nuts.

3,216

12-26-2015, 01:14 PM

Thread: No Pub. No. 229
Post: RE: No Pub. No. 229

Fred_B Wrote: (12-16-2015, 05:34 PM) -- 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://thenautic...

6,251

12-16-2015, 10:20 PM

Thread: Does anyone really shoot the Moon?
Post: Does anyone really shoot the Moon?

The moon's easy to shoot but does anyone bother with it? Probably, if it's the only object available- ya got ta' take what you can. R D.

15,860

12-15-2015, 02:43 AM

Thread: Forms
Post: RE: Forms

There's no space for chronometer error. Maybe put it in? Roland

30,262

12-15-2015, 02:42 AM

Thread: Making an Artificial Horizon?
Post: Making an Artificial Horizon?

Do any of you have pictures or plans of an Artificial Horizon you've made? I want to make one and it would be nice to see other examples. What fluid do you use? Water or oil? What kind of ...