A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Andrés Ruiz
Date: 2009 Mar 18, 11:10 +0100
Yes, I am interested in the Bygrave proyect, and
But or backup celnav system or Emergency Navigation I prefer to use the Sun: a Noon Sight. The necessary material is:
• Annual curve of the Sun’s declination. For Latitude calculation. (pdf for 2009)
• Annual curve for the equation of time. For Longitude calculation. (pdf for 2009)
• A watch set to UT.
• A Plastic Sextant - backup emergency sextant, (Davis Mark 3, …).
• A table with Dip, Refraction and PA, assuming: HP = 0.14', SD = 16'
• A copy of a general nautical chart, or a map. You must know where the point of the calculated latitude and longitude is.
• A pencil and paper
It is a very simply system, and playing with it I have obtained a position with an error of a few tens of nautical miles.
De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de Ken Gebhart
Enviado el: miércoles, 18 de marzo de 2009 3:50
Asunto: [NavList 7665] Re: New compact backup CELNAV system
The interest in your Bygrave project has been great and well
deserved. But when talking about "backup" systems, I think about one
who is ill versed in CN, and just wants to make a safe landfall
without his failed GPS. In this situation, I feel that using simple
noon sight procedures supplemented by sunrise/sunset longitudes, and
polaris Lats would be fine. All that would be needed would be the
Nautical Almanac (for the
included SR Tables for intermediate sights. One might not prefer
these NA SR tables, but they DO work, and in a backup situation, why
On Mar 17, 2009, at 6:26 PM, glapook@PACBELL.NET wrote:
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