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
    Re: What should I expect for a land based sight accuracy
    From: Randall Morrow
    Date: 2014 Jan 9, 15:57 -0800

    You should first check the index corrcetion for your Luna sextant to see if some of your error is there. Next, Don't judge the amount of intercept as the same the amount of error. Intercept values vary with the DR longitude chosen and also with the various methods of sight reduction you use. Publications 249, 229, 208 and direct solutions with the law of cosines may have diffrent intercepts with identical data. I would also withold judgement until you get a sight with absolutely no surface disturbance on the reflecting liquid. The judgement of the instant of tangency is always subjective and moreso when the brain has to "work around" a shaky image. The amount of error could be in something as simple as not holding the sextant vertially of aligning the images to far off to the side of the field of view. Other members may have more examples of error sources. Best of luck.
    Kind Regards, Randy
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    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