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Old 23-07-2011, 13:09   #1
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Hi From Northern Sweden

Örjan Here, just joined and like what I have read this far.
Main interest for me is old navigation techniques (sextant, khamal, astrolabe) and just existing in my 6m wooden craft.
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Old 23-07-2011, 13:40   #2
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Re: Hi from Norhtern Sweden

Welcome Örjan! I have family in southern Sweden. Beautiful country!
Eric
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Old 23-07-2011, 13:49   #3
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Re: Hi from Norhtern Sweden

thanks
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Old 23-07-2011, 14:16   #4
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Re: Hi From Northern Sweden

Welcome Aboard Cruisers Forum
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Old 26-07-2011, 20:33   #5
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Re: Hi From Northern Sweden

Aloha and welcome aboard!
On my first ocean crossing by sail in '84 we used celestial navigation. It worked very well. Its good to know it as a backup for GPS.
kind regards,
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Old 03-08-2011, 08:32   #6
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Re: Hi From Northern Sweden

uhm, dare I say that I do not own a GPS?
I DO own several sextants, even a old wooden octant and naturally sight reduction tables of several varieties and all other aids to sight computation.
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Old 03-08-2011, 11:38   #7
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Re: Hi From Northern Sweden

What?! No sunstone?

http://www.amazon.com/Secrets-Viking.../dp/0972151508
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Old 11-08-2011, 08:42   #8
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Re: Hi From Northern Sweden

LOL! yes sunstone is in my arsenal, uhm, actually two, one is only 12x18x4mm and bit small to work well.
I have made, bought or at least handled just about every instrument i have found documented enough to replicate, shadow-boards, sun-compass...
I have a father in law that is a cabinetmaker and I am myself traied as instrumentmaker (scientific instruments, theodolite, barometers...) so together we have been able to replicate such things as wooden octants, backstaffs, crossstaff, khamal, shadowboard, something like five or six suncompasses, quadrant, mariners astrolabe, nocturnal and several more with decent success.

oddly enough the khamal is usually within 11', pretty impressive for a home made instrument consisting of piece of wood and a string.
sad part with the high precission khamal was that I had to cheat and use synthetic string (40kg spiderwire fishingline in this case as it was on hand), the natural fibre I originally used reacted too much to humidity and kept changing length on me throwing the original calibration out by almost 30'.

Oh, check this out if you like astronavigation, it is a shortstory (which is a decent tutorial in terrestrial astronavigation by the way) and a copy of the Bowditch long term almanac as PDF, great to print a few and have around
AmeriSurv.com - Long Term Almanac, or, what to do when you can't use your total station and GPS
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