NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Exercise #16 High Altitude Sights near Noon
From: Jeremy C
Date: 2008 Jul 21, 11:13 EDT
I've long been curious to discover just how close one could come with
the super-basic method of advancing arcs or circles position at the
standard Universal Plotting Sheet scale, which is why I was glad to be
presented with Jeremy's example from a CG exam.
Thanks again,
Hewitt
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From: Jeremy C
Date: 2008 Jul 21, 11:13 EDT
H
I've long been curious to discover just how close one could come with
the super-basic method of advancing arcs or circles position at the
standard Universal Plotting Sheet scale, which is why I was glad to be
presented with Jeremy's example from a CG exam.
Thanks again,
Hewitt
Hewitt,
If you look through my navigation notebook from the TS TEXAS CLIPPER, there
are at least 2 high-altitude sun sights. Unfortunately at that time, I did
not know about the methods of taking 2 shots a few minutes apart and didn't do
intersecting circles. If my memory serves me, the Z-distance was about 10
nm, which actually was quite a hindrance to try and get position better then
that.
Andres "cheated" a bit with the problem as he used a computer which
certainly wouldn't be allowed in the exam room, but it does show how
the circles work when reduced at sea. I haven't had the chance to shoot
any high altitude sun sights lately, but I will be mindful when I am at sea and
will try to get some if it is possible.
Jeremy
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