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: Refilling a compass, was: Compass tilt
    From: Trevor Kenchington
    Date: 2004 Jun 21, 20:08 +0000

    Mr. Gurnell (Capt. Gurnell?) wrote:
    > Re change from quadrantal to 360 degree compass cards. -
    > I remember being on my first British ship in convoy from Liverpool to West
    > Africa early in September 1939 and the compasses were marked in quadrants. Then
    > early in 1940 they were in the 360 notation.  My guess was that the change was
    > made to avoid mistakes when complying with courses ordered by the Commodore of
    > the convoy.  Does anyone have any other ideas? n.s. gurnell
    I can remember reading something on this issue in the last few years but
    (as I indicated in my earlier message), I cannot recall the details. I
    _think_ that the RN adopted 360-degree notation during or shortly after
    the 1914-18 War. It is quite likely that most ships in the British
    merchant service continued using quadrantal notation. If so, the return
    of convoy late in 1939 would have strongly encouraged standardization,
    not so much for communication between the convoy commodore (often aboard
    a merchantman) and his ships as for communication between the escort
    commander (in a warship) and the convoy.
    It may also have been substantially easier to work out zig-zag courses
    in 360-degree notation: swapping about between North 80 degrees East and
    South 70 degrees East, either side of an average course of South 85
    degrees East, may come naturally to those who have thought in quadrantal
    terms since childhood but it can't be as easy for neophytes to pick up
    as zig-zagging between 080 and 110, either side of 095.
    Trevor Kenchington
    Trevor J. Kenchington PhD                         Gadus@iStar.ca
    Gadus Associates,                                 Office(902) 889-9250
    R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
                         Science Serving the Fisheries

    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