Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Re: "100 Problems in Celestial Navigation"
    From: Rodney Myrvaagnes
    Date: 2004 Apr 1, 18:19 -0500

    On Thu, 1 Apr 2004 14:21:30 -0800, David Weilacher wrote:
    >I bought this book years back and gave up on it because it lacks proofs for 
    the answers given.  I had considered using this forum to help but couldn't 
    figure out how to do that without infringing on the author's well deserved 
    >OTOH, answers 5-10nm different than his, aren't particularly unreasonable.  
    HO229, HO249, and various plotting programs, etc, can have that kind of 
    variation between them.  Even using the same tables, a sight reduction form 
    can introduce differences.
    Is that really so? I have always considered it to indicate
    sextant-reading errors if I came out more than a mile from actual (GPS)
    location. 5-10 seems excessive for different reduction methods from the
    same data. Am I taking your meaning correctly?
    I haven't tried all those table-based methods, but have used
    calculators and a spreadsheet program, the latter based on the analytic
    reduction method in the Nautical Almanac.
    Rodney Myrvaagnes     NYC                                               J36 Gjo/a
    "Accordions don't play 'Lady of Spain.' People play 'Lady of Spain."

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

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

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

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

    Email Settings

    Posting Code:

    Custom Index

    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