Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    Name or NavList Code:
    Email:
       
    Reply
    Re: Accuracy of Bygrave
    From: Gary LaPook
    Date: 2009 Jul 7, 22:47 -0700

    See today's response on   Bygrave formula accuracy on 10 inch slide
    rule  thread.
    
    gl
    
    On Jul 5, 10:49�pm, Gary LaPook  wrote:
    > My experience with the accuracy of the models I made is that it is
    > consistently within two minutes of arc and most often within one minute.
    > This is consistent with what others have written about the instrument,
    > including Bowditch, article 2121. So the error doesn't exceed 2 nautical
    > miles, 2.3 sm.
    >
    > There are some rare special cases that require a slight change in
    > procedure but when the special procedures are followed the accuracy of
    > the computed altitude remains within 2 minutes of arc. See instructions at:
    >
    > http://www.fer3.com/arc/img/108719.revised%20form%206-18-09.pdf
    >
    > Regarding accuracy see the attached documents and:
    >
    > http://www.fer3.com/arc/img/106329.bygrave%20pages%20from%20naca-repo...
    >
    > http://fer3.com/arc/m2.aspx?i=107947&y=200904
    >
    > http://www.fer3.com/arc/img/106329.bygrave%20manual.pdf
    >
    > http://www.fer3.com/arc/img/106329.imgp5241.jpg
    >
    > gl
    >
    > �weems-bygravee.pdf
    > 1304KViewDownload
    >
    > �LykxxBygrave.pdf
    > 317KViewDownload
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To , email NavList-@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site