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View Poll Results: Keeping celestial nav skills alive
Never learned, too many sight reduction books to haul around 18 8.22%
Plan to learn, on the "to do list" 80 36.53%
Learned, but no longer practice 56 25.57%
Learned, but only practice to keep the skills 50 22.83%
The hubby/wife does it 1 0.46%
Learned, practice every chance for that perfect pin wheel 14 6.39%
Voters: 219. You may not vote on this poll

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Old 25-02-2012, 09:08   #211
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Wink Re: The New and Improved Celestial Navigation Poll

Gosh.. I am in the majority on this poll ( procrastination is my long suit)...in the mean time..I will continue to use the "calabash"....but the chop on the water always makes that a bit difficult...ROFL
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Old 25-02-2012, 09:33   #212
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Re: The New and Improved Celestial Navigation Poll

Quote:
Originally Posted by s/v Jedi View Post
p.s. For all of those that buy old Russian or Iranian sextants made from brass in wooden boxes etc. : for $0.99 you can just buy the iPhone app and be done with it



ciao!
Nick.
Ok Nick - I give up! Where is it? I've looked everywhere in the Nav catagories for I-tunes App store - can't find it!
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Old 25-02-2012, 10:25   #213
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Re: The New and Improved Celestial Navigation Poll

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Ok Nick - I give up! Where is it? I've looked everywhere in the Nav catagories for I-tunes App store - can't find it!
Turn on iPhone, go to app store, select search, type sextant, tap go....

First hit is the app.

cheers,
Nick.
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Old 25-02-2012, 11:07   #214
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Re: The New and Improved Celestial Navigation Poll

I think a plastic sextant is a nice thing for training and may be used as an emergency or backup equipment. But anybody who does want to use their sextant for navigation may consider going right for a simple metal one: they are not much more expensive, they are more accurate and they offer better mechanics&optics.

b.
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Old 25-02-2012, 11:12   #215
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Originally Posted by barnakiel
I think a plastic sextant is a nice thing for training and may be used as an emergency or backup equipment. But anybody who does want to use their sextant for navigation may consider going right for a simple metal one: they are not much more expensive, they are more accurate and they offer better mechanics&optics.

b.
For emergency survival mode?

cheers,
Nick.
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Old 25-02-2012, 11:31   #216
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Re: The New and Improved Celestial Navigation Poll

I shoot my sextant quite often while underway. I'm 64 yrs old now and try to keep my brain active w/ math to keep the grey matter from turning black..I too use the GPS daily and have a plotter. But we all need something to stay busy. Alway's carry paper charts on board and use them. I have found serveral errors w/ chart plotter info.. It's just peace of mind for me & the wife..Michael..
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Old 25-02-2012, 11:34   #217
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Re: The New and Improved Celestial Navigation Poll

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Turn on iPhone, go to app store, select search, type sextant, tap go....

First hit is the app.

cheers,
Nick.
Now why didn't I think of that?
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Old 25-02-2012, 15:18   #218
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Re: The New and Improved Celestial Navigation Poll

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Originally Posted by barnakiel View Post
I think a plastic sextant is a nice thing for training and may be used as an emergency or backup equipment. But anybody who does want to use their sextant for navigation may consider going right for a simple metal one: they are not much more expensive, they are more accurate and they offer better mechanics&optics.

b.
How accurate does a sextant have to be? Any sextant, the plastic ones included are more accurate than the human using it. A high dollar insturment may give you a warm and fuzzy feeling but it will not insure you that you will get a better LOP from an observation.
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Old 25-02-2012, 21:36   #219
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Re: The New and Improved Celestial Navigation Poll

Quote:
How accurate does a sextant have to be? Any sextant, the plastic ones included are more accurate than the human using it. A high dollar insturment may give you a warm and fuzzy feeling but it will not insure you that you will get a better LOP from an observation.
First let me say that a plastic sextant such as a Davis Mk 15 is sufficiently accurate for practical navigation and is capable of reliably getting a good operator within 4 to 10 miles of true position. I would certainly advocate one for a beginner learning the ropes; if one eventually decides it is too much trouble and prefers instead to use electronic navigational aids instead, then one won't be out a whole lot of money. A top of the line metal sextant on the other hand, can get you within a mile or less if you are careful. A Davis would be perfectly adequate for getting you to a destination provided the destination is relatively large and easily spotted. If your destination is a small, low-lying island like Howland or Gardner, a good top of the line sextant such as my C.Plath or Freiberger will put you within visual sighting distance; a plastic sextant might if you are both good and lucky, put you within visual range, but most likely will not.

The following has some interesting insights into using a plastic sextant:

http://www.starpath.com/online/celestial/plastic.pdf
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Old 25-02-2012, 22:06   #220
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Re: The New and Improved Celestial Navigation Poll

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Originally Posted by Astrid View Post
First let me say that a plastic sextant such as a Davis Mk 15 is sufficiently accurate for practical navigation and is capable of reliably getting a good operator within 4 to 10 miles of true position. I would certainly advocate one for a beginner learning the ropes; if one eventually decides it is too much trouble and prefers instead to use electronic navigational aids instead, then one won't be out a whole lot of money. A top of the line metal sextant on the other hand, can get you within a mile or less if you are careful. A Davis would be perfectly adequate for getting you to a destination provided the destination is relatively large and easily spotted. If your destination is a small, low-lying island like Howland or Gardner, a good top of the line sextant such as my C.Plath or Freiberger will put you within visual sighting distance; a plastic sextant might if you are both good and lucky, put you within visual range, but most likely will not.

The following has some interesting insights into using a plastic sextant:

http://www.starpath.com/online/celestial/plastic.pdf
Now your speaking my language. I'll bet you pin wheel your LOPs on a small scale chart, don't you?
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Old 26-02-2012, 07:38   #221
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Re: The New and Improved Celestial Navigation Poll

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Originally Posted by Astrid View Post
First let me say that a plastic sextant such as a Davis Mk 15 is sufficiently accurate for practical navigation and is capable of reliably getting a good operator within 4 to 10 miles of true position. I would certainly advocate one for a beginner learning the ropes; if one eventually decides it is too much trouble and prefers instead to use electronic navigational aids instead, then one won't be out a whole lot of money. A top of the line metal sextant on the other hand, can get you within a mile or less if you are careful. A Davis would be perfectly adequate for getting you to a destination provided the destination is relatively large and easily spotted. If your destination is a small, low-lying island like Howland or Gardner, a good top of the line sextant such as my C.Plath or Freiberger will put you within visual sighting distance; a plastic sextant might if you are both good and lucky, put you within visual range, but most likely will not.

The following has some interesting insights into using a plastic sextant:

http://www.starpath.com/online/celestial/plastic.pdf
The part about the food fight covinced me that I had reached the end of this thread.
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Old 26-02-2012, 11:22   #222
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Re: The New and Improved Celestial Navigation Poll

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Originally Posted by moira View Post
How accurate does a sextant have to be? Any sextant, the plastic ones included are more accurate than the human using it. A high dollar insturment may give you a warm and fuzzy feeling but it will not insure you that you will get a better LOP from an observation.
I am afraid, half of the time, you may be wrong. Think about it this way:

- there will be some observation error,
- there will be some data/calculation error,
- there will be some instrument error,
- etc.

Now, if we assume these small errors will balance out, then your attitude is correct. But how likely is this, and are we going to bet our security on it?

Cheers,
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Old 26-02-2012, 11:28   #223
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Re: The New and Improved Celestial Navigation Poll

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For emergency survival mode?

cheers,
Nick.
I think a position from a plastic sextant is better than no position (well, read it: better than a DR after a 1000 mile+ run.

I think inexpensive metal sextants are worth the small extra we pay for the metal.

Having used a cheap metal sextant (for navigation) and a plastic sextant (to see the difference) I would pick up the metal one for navigation.

b.
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Old 27-02-2012, 07:14   #224
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Re: The New and Improved Celestial Navigation Poll

Has any one ever used easynav software. You can enter sights cog sog and it acts like a plotter. Plus you wouldnt need all the books. I have just downloaded the free trial once I get it figured out I'll tell you how I feel about it. Hopefully someone has tried it.
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Old 03-04-2012, 13:29   #225
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Re: The New and Improved Celestial Navigation Poll

I bought a new sextant, and a few books. Intend to teach myself (like everything else) when I really need to.
Used one in the past for coastal (horizontal) - reckon its worth it just for that use.
But, horizontal is probably about 2% of its potential/knowledge required for celestial.
I am also planning to get captain's license, and become proficient with SSB - lot of dust on these books..(cpy&pasted from other cn thread).
Is a calculator, or software program worth it - or anathema to the whole idea? And how many books - almanacs and sight reduction tables do you need?
thx
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