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: Zero Mag. Sight Tube
    From: Stan K
    Date: 2015 Oct 11, 20:33 -0400
    This discussion got me wondering.  I recently did some research trying to find the standard sextant with the longest usable arc.  I found it to be the Navy Mark II, with a usable arc of 145º.  If my calculations are correct, you would be able to, albeit with difficulty due to the index mirror being just a sliver in the horizon glass, take artificial horizon sights on the Sun any day of the summer up to a latitude of about 41ºN.

    BTW, I also have the bubble sight tube, and find it extremely difficult to use.


    -----Original Message-----
    From: Sean C <NoReply_SeanC@fer3.com>
    To: slk1000 <slk1000@aol.com>
    Sent: Sun, Oct 11, 2015 10:06 am
    Subject: [NavList] Re: Zero Mag. Sight Tube

    Frank A.,
    Yes, I also have the bubble sight tube, although I haven't tried using it much. I haven't even determined the correction to use with it. I have the same problem as you, running out of arc in the summer, being at 37° North. After reading your post, I think I'll give it another try, as well. Thanks!
    Sean C.
    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