NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Need help writing a slope-fit excel sheet
From: Stan K
Date: 2014 Jan 25, 07:20 -0500
From: Stan K
Date: 2014 Jan 25, 07:20 -0500
Greg,
Even though it might not answer your specific question, there is a massive spreadsheet that includes sight averaging that you might be interested in checking out. It is available at
http://www.calmseas.org/boating_links/boating_links.html
It is under "Education" and is called "Celestial Navigator". Its User Guide is also there.
Celestial Tools also includes a sight averaging function, but the way it selects outliers is crude compared to a graph.
Stan
Even though it might not answer your specific question, there is a massive spreadsheet that includes sight averaging that you might be interested in checking out. It is available at
http://www.calmseas.org/boating_links/boating_links.html
It is under "Education" and is called "Celestial Navigator". Its User Guide is also there.
Celestial Tools also includes a sight averaging function, but the way it selects outliers is crude compared to a graph.
Stan
-----Original Message-----
From: Greg Licfi <cfi@licfi.com>
To: slk1000 <slk1000@aol.com>
Sent: Fri, Jan 24, 2014 8:02 pm
Subject: [NavList] Need help writing a slope-fit excel sheet
From: Greg Licfi <cfi@licfi.com>
To: slk1000 <slk1000@aol.com>
Sent: Fri, Jan 24, 2014 8:02 pm
Subject: [NavList] Need help writing a slope-fit excel sheet
Hi all,
I read a article by David Burch concerning sight averaging with (I
believe) the intent on improving
the sights taken with plastic sextants. Mr. Burch believes that this
technique should be applied to metal
sextants to improve overall accuracy. One of the things he suggested is
doing a slope-fit of the multiple
sight data to kick out not-so-obviously-bad data points. It all makes
sense to me. I started to write a slope-fit
excel sheet (which eventually I can use on my smart phone) There are two
plots: one is the sight data
in BLUE, the second is a Hc for the start & stop times of the sights it
is in RED. ultimately you will be able to
slide the RED Hc plot up or down to see if the sight data points fit the
slope. I'm stuck getting the buttons
to work. I would ask if there are any excel mavens on the list if they
could look at my attached sheet and
help me activate the cursor up/down buttons; I'm not super knowledgeable
on macros. Once that is figured
out it should be quite handy for isolating bad sights.
Many Thanks In Advance!
~Greg
P.S.
Typically how many sights on average should one take, and over what time
span?
