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: Spotting scope technique, success wow!!...
    From: Hewitt Schlereth
    Date: 2015 Dec 13, 15:51 -0800
    Mark, I have the sticking phenomenon in two of my Davis Mk-15s. Never thought of oil, and would really appreciate it if you'd let me know the brand of lube you are using. 

    Thanks,
    Hewitt

    On Dec 13, 2015, at 2:55 PM, Mark Coady <NoReply_MarkCoady@fer3.com> wrote:

    Took a C & P  sextant today in the balmy december weather, and used Frank's technique (as  understand it) to up set the horizon mirror and set index correction. I used my stanley london 20x spyglass, a beautiful gift from a lovely lady now passed.

    I can only say the ease and results were spectacular. I used a far distant vertical flagpole in view of my boat dock, wth the sextant standing on its legs.  I had previously set this mirror for a .1 - .2 index correction using the sun SD method and distant roof edge checks. With the scope technique, I was able to literally zero this one out from this preliminary setup.  Later sextant checks with its own scope remounted proved out the initial happy results. 

    Can't wait to try it on my own Astra III and especially my old davis plastic.  THe plastic makes me totally waka waka because index vs precision error can be hard to evalaute at times. I find a tight hand grip on my Davis can distort the readings.

    PS I also find using a high grade low friction lube on plastic sextants to be key...as it reduces tiny little sticking errors and incremental jumps.

     

    View and reply to this message

       
    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