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    Re: The Accuracy of Astronomical Observations at Sea
    From: Gary LaPook
    Date: 2013 Mar 23, 21:52 -0700
    We have discussed this before Starting in September 2010 through December so look in the archives, http://www.fer3.com/arc/sort2.aspx?y=201009
    . I posted my results here:

    http://fer3.com/arc/m2.aspx/Accuracy-sextant-observations-sea-LaPook-sep-2010-g14008

    http://fer3.com/arc/m2.aspx/Transatlantic-on-Royal-Clipper-celnav-LaPook-nov-2009-g10827

    http://fer3.com/arc/m2.aspx/Accuracy-sextant-observations-sea-LaPook-sep-2010-g14025

    http://fer3.com/arc/m2.aspx/Accuracy-sextant-observations-sea-LaPook-nov-2010-g14398

    http://fer3.com/arc/m2.aspx/Accuracy-sextant-observations-sea-Huxtable-sep-2010-g14011

    http://fer3.com/arc/img/114011.100301.pdf

    http://fer3.com/arc/m2.aspx/Accuracy-sextant-observations-sea-JeremyC-sep-2010-g14020

    gl



    --- On Fri, 3/22/13, Brad Morris <bradley.r.morris---.com> wrote:

    From: Brad Morris <bradley.r.morris---.com>
    Subject: [NavList] Re: The Accuracy of Astronomical Observations at Sea
    To: garylapook---.net
    Date: Friday, March 22, 2013, 12:02 PM


    Chief Franklin

    I was hoping this topic would catch your eye.  It references a topic which, it is clear, you participated in!

    The data from  PVH Weems did seem very good (+/-0'.6 for an individual LOP), almost too good.  In your experience, what could one expect to achieve with celestial in deep water?  Is it +/- 3'.0 or some other value? 

    As an evaluator for US Navy navigation systems, you must have seen expected numbers for celestial navigation.  If its possible, can you share some of those numbers with us?

    I'm looking for coastal piloting and deep water celestial values.

    Thanks Chief!

    Brad Morris

    On Mar 22, 2013 1:46 PM, "Byron Franklin" <byronink---com> wrote:

    Byron:Very interesting for a quick read. I never knew my accuracy while Navigating any ship at in deep water, at sea, except the sub,s.and coming in to port. I didn't think my accurcy was as good as what I saw in the artical. It is interesting to read this checks on celestial accurcy, but, not important to the sea goer. If you obtain a celestial fix at sea and it's off 3.o miles and you are observing from a ship with eye,s 16 feet and above the water the horizon is about 4.4 miles away (distance to horizon)
    you should see the rocks in your line of sight. The accuracy of 0.something is not and should not be expected in deep water navigation. I evaluated and reported on new equipment for the Navy for many year, except for the sub's and close water piloting a fix off few miles were of no concern then?

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