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: Emergency sun declination
    From: Doug Royer
    Date: 2004 May 20, 16:46 -0700
    Yes sir, thanks for catching that.
    Allow me to add any printed circle will work.Relative Motion Plotting sheets are also used.
    We are talking "emergency" navigation here.Not the fine points of theoretical calculations.If you know the limitations of any method you will be able to work within those limitations and get "passable" results."Passable" is relative to what is needed in a situation.
    In a real situation as one would be attempting to use these emergency methods there are other,environmental,physical and mental states etc,stimuli at work that can degrade whatever is trying to be accomplished.
    The new STCW training is great in that respect.You get practical problems to solve in adverse conditions.What looks easy to accomplish at the desk in the study can be almost insermountable when stressed and in an threatening situation.
    Simple little things may make the differance between life and death.

    Doug R wrote:
    "It is a straight forward procedure.But you must have a rose or universal plotting sheet."

    That's the nice thing about this approach compared to the draw your own circle approach. As Ken mentioned, the tricky part is dividing up the points around the hand-drawn circle. A printed compass rose at least gives you a reliable starting point.

    "6.Multiply that ratio by 22.50*(degree)"

    That's a typo, I assume (it was in Jim's post, too). It should be 23.5 degrees.

    Frank R
    [ ] Mystic, Connecticut
    [X] Chicago, Illinois
    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