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Main
Date: 06 Sep 2006 02:10:33
From: W. Watson
Subject: Using a Sperti MK II Astro-Compass (Sextant)
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Someone gave me an astro-compass to use to determine true north. Anyone know
how to use it? It's the second image at
<http://www.warbirdsite.com/museumnavigation.html >.
Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
--
"I have made a ceaseless effort not to ridicule, not to bewail,
not to scorn human actions, but to understand them."
-—Baruch Spinoza
Web Page: <home.earthlink.net/~mtnviews >
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Date: 05 Sep 2006 22:08:56
From: Richard Adams
Subject: Re: Using a Sperti MK II Astro-Compass (Sextant)
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W. Watson wrote:
> Someone gave me an astro-compass to use to determine true north. Anyone
> know how to use it? It's the second image at
> <http://www.warbirdsite.com/museumnavigation.html>.
>
> Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
> (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
> Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
I suggest reverse engineering and see what procedure that yields.
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Date: 06 Sep 2006 04:30:30
From: W. Watson
Subject: Re: Using a Sperti MK II Astro-Compass (Sextant)
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Richard Adams wrote:
> W. Watson wrote:
>
>> Someone gave me an astro-compass to use to determine true north.
>> Anyone know how to use it? It's the second image at
>> <http://www.warbirdsite.com/museumnavigation.html>.
>>
>> Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
>> (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>> Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
>
>
>
> I suggest reverse engineering and see what procedure that yields.
It's a surprisingl complex device. It has a sight marked declination. A
level (bubble). A true bearing circle graduation from 0 to 360 deg. A true
course axis graduated circle (0 to 360, N, W, S, E). H. A. (hour angle) and
S. Lat (???) circle (0-360 in red). And more. I think I'm in need of a manual.
Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
--
"I have made a ceaseless effort not to ridicule, not to bewail,
not to scorn human actions, but to understand them."
-—Baruch Spinoza
Web Page: <home.earthlink.net/~mtnviews >
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