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: astrocompass still in use
    From: JC Sutherland
    Date: 2002 Sep 27, 22:27 +0100

    Quoting Robert Eno :
    
    > Interesting application.
    >
    > How on earth did you manage to keep your astrocompass perfectly level
    > whilst
    > it was mounted on your boat?
    >
    > Robert
    >
    > > Hi.
    Yes, levelling is a problem but as it happened it was quite a calm day and we
    were in an enclosed harbour. Each mesurement was done several times (under
    engine with no sails up) and I chose the best steadiest moment for each
    observation. A particular difficulty was that on a couple of headings the sun
    was obscured by the mast. These readings were extrapolated from the others and
    I had to recheck them next day. It was satisfying that they came out as
    expected.
    Another useful trick was to calculate the magnetic co-efficients from the data
    (the program is quite simple) and then to synthesize the deviation curve from
    these. This results in a smooth curve to best fit the data.
    
    > > > Clive Sutherland.
    > > Wantage, (where King Alfred burnt the cakes).
    > > 51deg 38.2 min N 001deg 24.5min W
    
    
    

       
    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