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: Consistent error question
    From: Marty Lyons
    Date: 2014 Oct 2, 10:01 -0700

    The sextant is a brand new Ogawa Seiki, clone or twin of a Tamaya. I have adjusted the index and side errors. Adjusted index error by shooting the sun with arm set at zero, made the two images coincident and read index error, 2' on arc. I take that off the double angle from the Art Hor siight. I reduce my sights using the HO 229 method, and check them with Navigator Light software. I am a little unclear on the Nav Light software, free version, as to how it handles A H shots.  My shots have been lower limb, in other words, I bring the reflected image down and make it tangent with the top of the image in the horizon glass from the A H. I believe the software asusmes lower limb shots, and I enter half the angle. The software corrects for semi diameter.

    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