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Subject: Re: How to choose among position lines?
From: Royer, Doug (doug.royer@XXX.XXX)
Date: Wed Jun 11 2003 - 16:13:04 EDT
Jared,you bet.I believe I understand what you're saying.Critique what I
think you're saying.One takes 4 sights in a round not spaced 90* apart but
each one at some degree of seperation.One then takes 2 sights of the same
body at each Zn and works the plot the same way as if takeing 8 sights
evenly spaced.
As for the spaceing of Zn's by divideing the number into 360*,it's a decient
proceedure used insure a workable Zn spread.I've encountered the same thing
on study material.I believe it is used to teach the student reduction
mechanics but is not very practical in real use.Even on a starry cloudless
night why would a person spend the time to do a 5,6,7,8 or an infinite
number of sights in a round when a 1 or 2 sight round combined with an
advance or a maximum 3 to 4 sight round would give a very workable MPP.It
would,in my opinion,be smarter to do a number of smaller number sight rounds
throughout the day instead of all at once.
-----Original Message-----
From: Jared Sherman [mailto:jared.sherman@XXX.XXX]
Sent: Wednesday, June 11, 2003 11:49
To: NAVIGATION-L@XXX.XXX
Subject: Re: How to choose among position lines?
Doug-
I wonder, if perhaps dividing the number of sites into 360 degrees and
spreading them out evenly is counterproductive? Consider that case of 8
sights. If I plot them evenly about I'll get one smudge on the chart. But if
I plot two sights each at 4 positions...The difference between the two lines
from any one direction will also tell me that I have an error of at least
that amount.
Wouldn't that information be just as useful?
Aside from star sights at night on a cloudless sea, who would have the
luxury to take 8 sightings in equidistant directions anyway?<G>
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