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: Bubble sextant collimation
    From: Greg Rudzinski
    Date: 2015 May 21, 07:47 -0700


    The eye will do the centering for you. Line up the visual center of the bubble with the visual center of the Sun side by side. This should provide results of between +/- 2' to 4' on an Hs observation. Determining index error will be a trick. Using Polaris as per LaPook method works very well for index error determination (explanation is somewhere in the archives).

    Greg Rudzinski

    P.S. I like practicing just sitting in the passenger seat of a parked car. If your sailboat is moored in a slip then practicing from the cockpit will work pretty good.

    From: Andrés Ruiz
    Date: 2015 May 21, 14:23 +0200

    I am aware how the real situation was during WW2, or is when flying.
    But asking the question otherwise, avoiding Coriolis, on a steady situation, on land, using the limb of the Sun:
    how do you make the observation?
    how do you align the bubble and the Sun? alternatives to the pictures.
    expected accuracy? with 2' or 1' of resolution in the vernier
    Andrés Ruiz
    Navigational Algorithms
    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