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: Bubbles at sea
    From: Hewitt Schlereth
    Date: 2008 Jul 13, 22:34 -0400

    I am absolutely astounded at the results Weems got. I tried my Navy
    Mark V a few times from a 40-foot yawl and my LOPs with the bubble and
    averager were never closer to the DR than 40 NM. Using the horizon
    prism and averager I got results comparable to what I got with my
    Ebbco - LOPs at distances from the DR of 5% to 10% of the distance run
    since the last fix. My guess is that Weems was on a true ship where
    the period of roll and pitch in decent going might be comparable to
    that of an aircraft.  -HewS
    On 7/13/08, d walden  wrote:
    > Attached is a table from Weems, Marine Navigation, 1940 showing accuracy of
    > bubble sextant measurements at sea.
    > It seems from the text Weems thought they would prove quite popular.
    >  >
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com

    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