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: [Fwd: Davis Sextants]
    From: Chuck Taylor
    Date: 1999 Jan 25, 9:56 AM

    On Mon, 25 Jan 1999, carl wrote:
    > The two major problems with the M25, are, 1) The full view mirror is
    > difficult to use with stars as nautical twilight approaches (as has been
    > noted--although it's fine for sun sights) and 2) the mirrors are very difficult
    > to adjust--the mounts are too light so the act of adjustments causes the mounts
    > to flex and the threads of the adjustment screws need to be finer to allow more
    > precision.
    With regard to problem #2 above: the power squadron I belong to owns
    several Mark 15's and 25's and I've also examined several belonging to
    others. The quality seems to vary from unit to unit. Some are pretty
    good. On one there is simply not enough travel in the mirror adjustment
    mechanism to adjust it properly. It just won't go far enough in the
    required direction. Also, the adjustment screws have too much play. So
    far I've only seen the one bad apple, but it pays to be careful when
    purchasing one, whether new or used.
    As for the optics, comparing the scope on a Davis sextant to the scope
    on an Astra is like comparing the brightness of a 15 watt bulb to that
    of a 100 watt bulb at 100 yards. The light-gathering ability (and hence
    the brightness of the image) is more critical than the magnification
    Still, I tell my students that the Davis is plenty good enough to find
    any port in the world and is a good learning tool for the price.
    Chuck Taylor
    Everett, WA
    =-=  TO UNSUBSCRIBE, send this message to majordomo@roninhouse.com:     =-=
    =-=      unsubscribe navigation                                         =-=

    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