NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Andrés Ruiz
Date: 2010 Dec 10, 09:34 +0100
---Peter wrote:
Systemic error can be
dealt with by bisecting each angle formed by intersecting position lines.
If a triangle, and
azimuths with a spread of less than 180 degrees, then the fix will be outside
the triangle. The probability is 100%.
With an azimuth spread
greater than 180 degrees, then the fix will be at the centre of the triangle. The probability is, again, 100%.
I think there is some misunderstanding
about bisector method:
·
One is bisecting
the angle of the triangle
·
an another
is to use the bisector of the azimuths of each pair of LoP. Has the
important property
that is
free of systematic errors.
---Tom wrote:
I think it would be
interesting to see the results of various methods. But I must confess, I use
"Mark I eyeball" to estimate best fit.
For the example CY3 in my previous e-mail
the solution by the bisector of the azimuth is the same as in LS:
I am agree with Tom; one thing is
the mathematical basis, very interesting of course, and another is the real
world, where in practical navigation I take for the fix in a cooked hat, not a point,
but a circle with a radius based in my experience and felling of the circumstances,
is the blue, not the coast, where piloting techniques must be employed.
Regards,
--
Andrés Ruiz
Navigational Algorithms
http://sites.google.com/site/navigationalalgorithms/