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: Multiple LOP using one sun sight
    From: Marcel Tschudin
    Date: 2005 Aug 23, 14:58 +0300

    >> From T. Shanklin
    >>   Also, I've been trying to practice with the 2102-D starfinder lately-
    >> I've
    >> been having a real hard time having the calculated azimuths (as per 2102)
    >> correspond with the actual azimuth.  Maybe it's just my compass, but I
    >> always seem to be fairly far off (up to 20 degrees), even when I have the
    >> correct star.  I have been adjusting for local declination (true N to
    >> magnetic N).  Any tips?
    Reply from Peter Fogg
    > Sure you're not adding instead of taking away, or vice-versa, your
    > magnetic
    > variation? 20 degrees is a lot of deviation, or local error, but the
    > presence of magnets (eg, sound speakers) in the vicinity can do this.
    > Someone I know had a similar problem that was solved by removing the knife
    > in its sheath from the pillar holding the cockpit compass.
    As Peter Fogg mentions, 20 degrees is a lot. In order to find out how much
    error the boat contributes, I would suggest you compare compass readings
    with known azimuth values (calculated from a map using your known position
    and known reference points). Regarding declination, be aware that in North
    America this value does change within relatively short distances, this is
    due to the fact, that the magnetic pole is located at the moment in the
    north of Canada.
    Here some links which might help:
    On this Web page you can calculate the declination for a given location and
    Magnetic compass adjuster (30 days free tryal)
    Or the two general pages with a lot of links in it
    Hope it helps

    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