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
    or...
       
    Reply
    Pub. 249 and Pub. 229
    From: Bob Goethe
    Date: 2017 Dec 15, 18:40 -0800

    On page 45 of John Karl's book, Celestial Navigation in the GPS age, he says that:

    • Pub. 249 is tabulated to the nearest minute (an accuracy of +/- 0.5')
    • Pub. 229 is tablulated to the nearest 0.1' (implying an accuracy of +/-0.05')

    He goes on to say, "Unfortunately, that's not the case at all.  The best H.O. 229 can do is +/-0.2', which compared to H.O. 249's +/-0.5' accuracy, is only marginally better."

    I have pondered why this might be so...and have come up with nothing.  I would appreciate Karl (or anybody else for that matter) unpacking this for me a bit.

    Thanks.

    Bob

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting 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