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Latest Threads
Analog or Digital time di...
Forum: General Topics Here
Last Post: LouisC
10-21-2017, 01:13 AM
» Replies: 0
» Views: 16
Desperate Voyage
Forum: General Topics Here
Last Post: Rumata
10-17-2017, 01:21 AM
» Replies: 3
» Views: 93
Volvo Ocean race- cel nav...
Forum: General Topics Here
Last Post: Rumata
10-16-2017, 12:38 AM
» Replies: 1
» Views: 47
No GPS? Follow the North...
Forum: General Topics Here
Last Post: CarlosPindle
10-06-2017, 11:31 PM
» Replies: 0
» Views: 79
book- Two Years Before th...
Forum: General Topics Here
Last Post: Rumata
10-06-2017, 03:03 AM
» Replies: 3
» Views: 167
Astron Excel sight reduct...
Forum: The Sight Reduction process
Last Post: EdCa
10-04-2017, 10:22 PM
» Replies: 6
» Views: 91
glitch in Calcs.
Forum: General Topics Here
Last Post: Rumata
09-21-2017, 01:46 AM
» Replies: 3
» Views: 124
Calendars for 2018
Forum: The Terrestrial Almanac- 2018
Last Post: CelNav57
09-18-2017, 01:31 PM
» Replies: 0
» Views: 44
Sighting the eclipse
Forum: General Topics Here
Last Post: BigBill
08-22-2017, 04:31 AM
» Replies: 4
» Views: 351
How to buy a sextant
Forum: General Topics Here
Last Post: BigBill
08-13-2017, 11:16 PM
» Replies: 8
» Views: 459

 
  Analog or Digital time display
Posted by: LouisC - 10-21-2017, 01:13 AM - Forum: General Topics Here - No Replies

Do you have a preference for time display? 

Which do you like better?  Analog or digital?

Do any of you use mechanical watches (not quartz)?  Now wouldn't it just be nice to have a Rolex GMT Master?!

In desperation I've searched the web to hear the sound of a Rolex or Piaget ticking but haven't found anything!

Louis

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  Desperate Voyage
Posted by: CelNav57 - 10-15-2017, 02:20 AM - Forum: General Topics Here - Replies (3)

At Rumata's suggestion I purchased and received, today, a copy of John Caldwell's book, "Desperate Voyage".  The book came autographed by John Caldwell himself!  All for $3.85 from ebay!  In brief the book covers his 1946 solo sail from Panama to Australia.  He got wrecked on islands East of Fiji and is carried by ship to Australia.

The story he tells of his trip is nothing but disaster after disaster.  He didn't even know how to sail when leaving Panama and what happens to him along the way is evidence of that.  It would be difficult for me to describe the troubles he got himself into or that they even happened. 

He taught himself navigation while underway.  Here are a few words from the chapter entitled "Malpelo Isle". 

If you will navigate, take what is listed here and sail away.  When, after ten days of study and stars, you can't fix your position, turn back and take up harbor sailing, for you will never navigate.  Any sensible person who can see the sun or horizon plainly can use these tools to go around the world".

Mr. Caldwell's total navigational instrument cost was $8.90.  The sextant was given to him by a sea captain.

In keeping with my interest in boat names and how well things go for the captains of oddly named boats Caldwell's story is no different.  I'm not superstitious except about boat names.  Don't name your boat anything that challenges or affronts The Great Commodore of the Universe.  Here are some famous boat names and what happened to them;

Titanic.  Titanic is ancient Chaldean for....satanic.
Endurance.  (Shackleton's ship).  Crushed by ice and sunk.
HMS Terror (Franklin's ship) Sunk in the Arctic.  Crew- all died through starvation on land.

So what has that to do with the book Desperate Voyage?  It's this- Caldwell's boat is named- Pagan.  His boat was wrecked and smashed to pieces on an island near Fiji. 

But he alone has survived to tell thee.

It's a very interested and exciting book so far.

Fair winds....

CelNav57

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  Volvo Ocean race- cel nav?
Posted by: P.Rutherford - 10-14-2017, 12:27 AM - Forum: General Topics Here - Replies (1)

I was just watching a video about the Volvo ocean race 2014-15 and at this link;

https://youtu.be/vpM12gPOte8?t=34m32s

...it shows a sailor using a sextant.  I do not know what year they show in that excerpt of the video, as the sound is off (intentionally).  Nice to look at.

Paul

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  No GPS? Follow the North star! (poor people)
Posted by: CarlosPindle - 10-06-2017, 11:31 PM - Forum: General Topics Here - No Replies

I happened upon a website which is by an artist, Sam Kerson who is a creator of the arts and is presently, with his wife, in Italy observing the refugee influx from various impoverished and torn-by-war countries.

While in Italy He spoke to a man from Gambia who sought work in Libya but ended up for many months in a Libyan prison.  Finally, the man was released.  Here are the words he spoke to Mr. Kerson about his (the Gambian man held in a Libyan prison) exodus from Libya-

We press on, “but how did you get to Europe?”  “After nine months they come and say, you go now! They have AKs’; they drive us at gun point to the beach and load us in a fiberglass boat.”

All the prisoners are asking, “Where do we go?”
You go out to sea! Who cares? You live you die. We need the space.”
But we have no GPS”, the guard points with his AK and says, “Follow the north star.”


The boat they were in ran out of fuel.  As it turns out they were rescued by a ship off the coast.

Certainly a horrible story but I'm showing this as a contrast in navigational styles.  The next area North of Libya is Italy or Greece- both at quite a distance.  Following the North star would lead them directly North (true).  Now that's a quick course in celestial navigation...at gun point.

Poor folks.

Here's Mr.Kerson's website- Dragon Dance Theatre

Clear skies,

Carlos

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  Astron Excel sight reduction manual almanac
Posted by: Rumata - 10-01-2017, 07:03 AM - Forum: The Sight Reduction process - Replies (6)

Gentlemen, 

I just tried to use Sight reduction Astron spreadsheet / manual option and can't locate Altitude correction for Sextant sight.  Also, Index error shows only minus option. But if it is (-) should I add it instead of subtracting it from Hs? . When I entered the Height of eyes in meters the spreadsheet calc simply subtracted this number from Hs, not the data I saw in Nautical Almanac ( hard copy).  Anyway, I got a little bit different results for azimuth and intercept.

My question is: should I blindly trust the spreadsheet or paper/pencil approach? Yes it is much faster.

Again, difference about  +/- 1.5 deg. in azimuth and tolerable in the intercept results. Thank you.

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  book- Two Years Before the Mast
Posted by: CelNav57 - 09-26-2017, 12:39 AM - Forum: General Topics Here - Replies (3)

Rumata has recommended a very good book- Two Years Before the Mast.

Get it here, free;

Two Years Before the Mast

It was written by Richard Henry Dana in the early 1800's and mainly describes the life and times of American merchant sailors, as Dana experienced it, aboard ship(s) trading in California.  The book provides a very thorough picture of the trip Dana took aboard Pilgrim to California and his trip back to Boston aboard Alert.

Here's excerpt from the homeward bound portion of the book from California back to Boston;

Sunday, June 5th, we were in lat. 19° 29' S., and lon. 118° 01' W., having made twelve hundred miles in seven days, very nearly upon a taut bowline. Our good ship was getting to be herself again, and had increased her rate of sailing more than one third since leaving San Diego. The crew ceased complaining of her, and the officers hove the log every two hours with evident satisfaction. This was glorious sailing. A steady breeze; the light tradewind clouds over our heads; the incomparable temperature of the Pacific,— neither hot nor cold; a clear sun every day, and clear moon and stars every night, and new constellations rising in the south, and the familiar ones sinking in the north, as we went on our course,— ``stemming nightly toward the pole.'' Already we had sunk the North Star and the Great Bear, while the Southern Cross appeared well above the southern horizon, and all hands looked out sharp to the southward for the Magellan Clouds, which, each succeeding night, we expected to make. ``The next time we see the North Star,'' said one, ``we shall be standing to the northward, the other side of the Horn.'' This was true enough, and no doubt it would be a welcome sight, for sailors say that in coming home from round Cape Horn, or the Cape of Good Hope, the North Star is the first land you make.
---------------------------------------------------------

There are a lot of books about sailing and navigation you might find interesting, here;

Books


Clear skies,

CelNav57

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  glitch in Calcs.
Posted by: Rumata - 09-20-2017, 06:03 PM - Forum: General Topics Here - Replies (3)

Greetings,

Just was astonished to find out in useful links, Calcs, in sub-calculation named Trig., that cosine 90 deg=6.12... It is not what I was taught in school. ;> I was indoctrinated that cosine  90 deg. = 0.  Live and learn. ;> ;> Definitely, some kind of glitch. I'm checking other sub. calcs. But a warning that all results from those calcs should be kinda checked for "sanity." I hope this was The only glitch.

By the way, I opened those calcs with Google Chrome.

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  Calendars for 2018
Posted by: CelNav57 - 09-18-2017, 01:31 PM - Forum: The Terrestrial Almanac- 2018 - No Replies

Now you can get calendars for the year 2018 which we call The Terrestrial Almanac.

Get them here- The Terrestrial Almanac

The calendars provide;

- all 12 months on a single page
- each month on 2 pages
- each week on 1 page
- a note sheet per month
- a cover sheet for each month (good for notes also)

There are two separate calendars;

- 1 for the world which contains only time and season changes
- 1 for the United States which has the typical holidays, time and season changes

I hope you find them useful.

Fair winds....

CelNav57

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  Sighting the eclipse
Posted by: BigBill - 08-21-2017, 03:37 PM - Forum: General Topics Here - Replies (4)

I'm thinking I might try and take a sextant sighting of the sun (and moon) during the eclipse. It could be interesting.
I hope the clouds stay out of the way.

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  How to buy a sextant
Posted by: james1979 - 08-01-2017, 08:25 PM - Forum: General Topics Here - Replies (8)

Dear all,
I have been starting to consider some options to buy a sextant, and I have seen that many buy sextants that a no longer produced, or 'vintage' sextants, see for example this thread. Given that sextants are highly delicate precision instruments, how do you guys make sure that you will get a sextant in proper conditions when you buy a 'vintage' one? Is there a way to identify reliable online vendors? 

For example, in the thread above Douglas Denny says:

Quote:I have various sextants but the 'best' of all was amazingly cheap costing about £200  ($240  exchange rate Jan 2016), bought about four or five years ago;  it is a Russian SNO-T and was new, unused in the original box.  These were ex-Russian Navy released presumably as surplus to requirements.


Given that this is a 'vintage' model, I wonder how one could make sure that it was new in the box before purchasing it. 

Finally, I have a question about brand new sextants. I see that the brand that makes the sextant is not the same as the distributor. For example, Tamaya Technics does not sell directly its sextants. To buy one, one may go to Celestaire, or other distributors. What are some good, reliable distributors in Europe? Is Celestaire one of these? 

Thank you for your help!

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