NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Emergency sun declination
From: Doug Royer
Date: 2004 May 20, 16:46 -0700
From: Doug Royer
Date: 2004 May 20, 16:46 -0700
Yes
sir, thanks for catching that.
Allow
me to add any printed circle will work.Relative Motion Plotting sheets are also
used.
We are
talking "emergency" navigation here.Not the fine points of theoretical
calculations.If you know the limitations of any method you will be able to work
within those limitations and get "passable" results."Passable" is relative to
what is needed in a situation.
In a
real situation as one would be attempting to use these emergency methods
there are other,environmental,physical and mental states etc,stimuli at work
that can degrade whatever is trying to be accomplished.
The
new STCW training is great in that respect.You get practical problems to solve
in adverse conditions.What looks easy to accomplish at the desk in the study can
be almost insermountable when stressed and in an threatening
situation.
Practice,practice.Training,training.Repitition,repitition.
Simple
little things may make the differance between life and
death.
Doug R wrote:
"It is a straight forward procedure.But you must have a rose or universal plotting sheet."
That's the nice thing about this approach compared to the draw your own circle approach. As Ken mentioned, the tricky part is dividing up the points around the hand-drawn circle. A printed compass rose at least gives you a reliable starting point.
And:
"6.Multiply that ratio by 22.50*(degree)"
That's a typo, I assume (it was in Jim's post, too). It should be 23.5 degrees.
Frank R
[ ] Mystic, Connecticut
[X] Chicago, Illinois
