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Old no-plotting method ...
Forum: The Sight Reduction process
Last Post: Rumata
03-12-2024, 04:45 AM
» Replies: 7
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Hello
Forum: The Sight Reduction process
Last Post: PeterB
11-23-2023, 09:39 PM
» Replies: 11
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Electronic Charts: New Bo...
Forum: Equipment- Wanted or for Sale
Last Post: PeterB
10-15-2023, 01:37 PM
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assumed longitude
Forum: General Topics Here
Last Post: Rumata
10-07-2023, 10:34 PM
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What Is Your Favorite Wat...
Forum: Equipment- Wanted or for Sale
Last Post: craigsl
09-02-2023, 10:28 PM
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Camp Runamuck- TV show
Forum: Humor & Laughter
Last Post: craigsl
09-01-2023, 11:20 PM
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Help With an Exam Questio...
Forum: Humor & Laughter
Last Post: CarlosPindle
05-08-2023, 11:30 PM
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USCG Crazy Exam question:...
Forum: General Topics Here
Last Post: Fred_B
05-05-2023, 09:48 PM
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How to get LHA and Ap lon...
Forum: General Topics Here
Last Post: Fred_B
04-29-2023, 11:16 AM
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why Astron uses a "decide...
Forum: General Topics Here
Last Post: PeterB
03-31-2023, 01:21 AM
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Davis Mark 15 & 25 |
Posted by: BigBill - 03-05-2018, 01:20 AM - Forum: General Topics Here
- Replies (5)
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I was wondering if the Mark 25 "beam converging" mirror can be retrofitted to the Mark 15.
Davis says the split mirror of the Mark 15 can be fitted to the 25. The dimensions for the replacement parts are similar but not exactly the same. Maybe the reverse is not true. Would anyone happen to know?
I may end up getting a mark 25 anyhow if one pops up on ebay in my price range, in the meantime changing out the mirror might be an economical option.
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AP in the east. |
Posted by: wannathermal - 03-03-2018, 02:51 PM - Forum: The Sight Reduction process
- Replies (17)
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I think the instructions for Sight Reductions needs to have something like the following:
* Assumed Position for east longitude use DR longitude integral degree plus 60'-GHA minutes for the minutes, If you are at 35° east and the GHA minutes are 33' then AP is E35° 27' (60'-33'=27')
The instructions work for West.
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Filters |
Posted by: Speicus - 02-17-2018, 03:21 PM - Forum: General Topics Here
- Replies (6)
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What do sextant filters filter?
I think this is an important question when looking at the sun. If only visible light is filtered, my pupil widens and lets all ultraviolet through, like with low quality sunglasses. This will harm my eye.
Mine is a second-hand Freiberger sextant - I cannot find any specifications. Does anybody have any information?
Regards
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Just trying to be nice |
Posted by: Rumata - 12-22-2017, 07:14 PM - Forum: General Topics Here
- Replies (3)
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Merry Xmas and Happy New Year to all of us. Looks like we're still holding the fort. Good job we're doing.
Toast:
To all of us, members of Celestial Navigation Forum. May we keep sanity in the world which can't live without extra battery. Let's drink!
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A,B, P etc |
Posted by: BigBill - 11-12-2017, 04:35 PM - Forum: General Topics Here
- Replies (5)
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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 anything with H has to do with altitudes and the Zs are azimuths but the rest I don't know with enough certainty to pass on.
Thanks
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Analog or Digital time display |
Posted by: LouisC - 10-21-2017, 01:13 AM - Forum: General Topics Here
- Replies (2)
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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)
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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 interesting and exciting book so far.
Fair winds....
CelNav57
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