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: Using sun compass for calibrating boat compass
    From: Gary LaPook
    Date: 2014 May 7, 12:43 -0700
    Yes.  And see:

    http://fer3.com/arc/m2.aspx/Removing-Deviation-from-Ships-Magnetic-Compass-LaPook-aug-2013-g24815

    gl


    From: Bill B <NoReply_BillB@fer3.com>
    To: garylapook---.net
    Sent: Wednesday, May 7, 2014 12:31 PM
    Subject: [NavList] Re: Using sun compass for calibrating boat compass


    Duh. Refraction only raise the object toward the zenith, and therefore
    should should not affect the azimuth. Yes no?
    >
    > When reducing a sight one would traditionally compute the Hc, then the
    > azimuth from the Hc (although the azimuth can be computed directly
    > without the Hc).
    >
    > This is fine for plotting an LOP, but it raised a concern for me. Is the
    > azimuth I obtain for the celestial object tied to its Hc, rather than
    > its observed position with refraction?
    >
    > Perhaps the accuracy of a shadow sun compass (as opposed to a William
    > Burt solar compass )on a light to medium displacement sail craft is such
    > that it is a moot point?
    > ----------------------------------------------------------------
    > NavList message boards and member settings: www.fer3.com/NavList
    > Members may optionally receive posts by email.
    > To cancel email delivery, send a message to NoMail[at]fer3.com
    > ----------------------------------------------------------------
    >
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=127691
    >
    
    
    View and reply to this message: http://fer3.com/arc/m2.aspx?i=127692


       
    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