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: U.S. government sextant specification
    From: Jared Sherman
    Date: 2003 Jan 9, 18:12 -0500

    Very interesting, Paul.
    In my limited experience I have never met a sextant that provides for a means 
    of disengaging the gear rack while in storage, as this spec calls for.
    The requirement for accuracy of +-8 seconds along the entire arc would seem to 
    exceed that guaranteed by any manufacturer, even C&P only guarantee 9 seconds 
    for the Horizon Ultra.
    They don't offer LED illumination, either, they still use a tungsten bulb.
    For what it is worth, the Annapolis (USN) 44's specify a Cassens & Plath 
    Horizon Ultra as a standard piece of equipment carried on board.
    I wonder if any commercial sextant can actually meet the specifications. If 
    none can, then any manufacturer with any instrument can obtain a special 
    contract as the "sole available source" with the standard itself actually 
    waived, I believe.

    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