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 DIY Sextant		  New Topic  Topic Locked
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britinusa
Web Editor

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USA
5404 Posts
Initially Posted - 08/17/2007 :  16:18:05  Show Profile  Visit britinusa's Homepage
I have been lazily studying celestial navigation and wondered about a diy sextant.

did a google and found this site.. don't know if I should visit..
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Sponsored Links

Sextant $14.99
Brass Nautical Sextants 8 Models
Antique Navigation Instruments
bellydancercostume.info


<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Has anyone done anything like this (diy sextant!)?

Paul


ps. couldn't resist it...
I went to
http://bellydancercostume.info/proddetail.php?prod=nsextant11& cat=23

They actually have 'replicas' but not for use for navigation

paul
Joint Decision. (Sold)
PO C250WB 2005 Sail # 841.


Moved up to C34 Eximius

Updated August 2015
Edited by - britinusa on 08/17/2007 16:20:49

jerlim
Master Marine Consultant

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USA
1484 Posts
Response Posted - 08/17/2007 :  17:36:08  Show Profile
Much better than the sextant - on the same site - is the medieval helmet, methinks it could be an interesting addition...
http://www.bellydancercostume.info/categories.php?cat=19
Edited by - jerlim on 08/17/2007 17:36:51
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ilnadi
Captain

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452 Posts
Response Posted - 08/17/2007 :  21:53:45  Show Profile
GUYS!
how can you notice the helmet with all the surrounding pictures?
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 08/18/2007 :  12:02:27  Show Profile  Visit delliottg's Homepage
Paul,
If you're looking for an el-dirt-cheapo sextant, a [url="http://www.davisnet.com/marine/products/marine_product.asp?pnum=00011"]Davis Mark 3[/url] is a pretty good place to start. I found mine in a thrift shop for $15 (well, actually my mom found it, but same-same). I've seen them on Ebay for about the same price, and I found a Davis Mark 25 for $50. The handle on the back was broken, but that was quickly fixed with some epoxy. I now have about half a dozen sextants including a Russian Naval one I bought from a guy in Vladisvostok a few years ago.

As far as DIY, I started building basic quadrant some time ago, got the frame built, and the angle field printed out on vellum using AutoCAD, still need to make the vernier frame and put the whole thing together. I figured I could get about 1/4° resolution (15 minutes or so) when it was done. You should be able to build a similar sextant if you'd like. If you're looking for a good book on building ancient navigation tools, pick up a copy of [url="http://www.amazon.com/Latitude-Hooks-Azimuth-Rings-Navigational/dp/0070211205/ref=sr_1_1/103-2020248-3245421?ie=UTF8&s=books&qid=1187455908&sr=8-1"]Latitude Hooks & Azimuth Rings[/url]. It's got 18 projects inside to show you how to buid a number of different navigation tools of the ancient world, including an octant, which is very similar to a sextant except it measures 45° instead of 60° like a sextant.

While you're at it, pick up a copy of [url="http://www.amazon.com/Emergency-Navigation-Pathfinding-Techniques-Inquisitive/dp/0071565582/ref=pd_bbs_sr_1/103-2020248-3245421?ie=UTF8&s=books&qid=1187456412&sr=8-1"]Emergency Navigation[/url], you can learn how to use two pencils and a rubberband as a "sextant" to navigate on your life raft.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 08/18/2007 :  12:32:37  Show Profile
&gt;"pick up a copy of Emergency Navigation...."

&gt;[Amazon.com] "4 used & new available from $139.50" Yowser.

Heh... looking deeper, appears to be an error on their site.
Edited by - on
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jerlim
Master Marine Consultant

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USA
1484 Posts
Response Posted - 08/20/2007 :  14:51:58  Show Profile
'cause it's the only thing on the site that I could wear.
Edited by - jerlim on 08/20/2007 14:52:17
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britinusa
Web Editor

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USA
5404 Posts
Response Posted - 08/21/2007 :  03:37:44  Show Profile  Visit britinusa's Homepage
Thanks for those links David.
I was looking at the DIY option simply for the price break, but your ebay hint will do the trick.
Books look good too!
Thanks.

Paul
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.