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
    Name or NavList Code:
    Email:
       
    Reply
    Re: C&P bubble sextant - practical issues
    From: Tony Oz
    Date: 2022 Mar 22, 14:22 -0700

    David, I presume that people use the bubble sextants because they have no big open water space near-by. Most probably there could be some small pond or a lake. Then, to be able to use it as the reference, one must be as low as water itself, to hunker down completely. In such a case the Dip is negligible, well within the error of judgement where the bubble's center is.

    If one has access to the natural horizon as on the sea shore and wants to work comfortably - then, of course, the full-blown correction procedure is required: the HoE, the refraction - because the apparent horizon IS affected by atmospheric conditions significantly.

    Warm regards,
    Tony
    60°N 30°E

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

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

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

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

    Email Settings

    NavList ID 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