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: "Magnetic compass" program
    From: Lu Abel
    Date: 2014 Jun 04, 11:27 -0700
    Andres:

    In the North American English-speaking world, the usual convention is that T = true course, M = magnetic course, and C = compass course.

    This leads to the commonplace alphabetism  T V M D C,  where True course adjusted for magnetic Variation gives a Magnetic course, which is further adjusted for compass Deviation to give a Compass course.   

    I suppose TC, MC, and CC would be recognized, but I would go for the consistency of "C" at the end of each course designator rather than "MT" for magnetic.

    The traditional mnemonic for remembering TVMDC is "True Virgins Make Dull Companions" which, as you might guess, some find objectionable these days.    My favorite mnemonic goes the other way and harkens to the days of political corruption in Chicago where after an election the newspapers used to publish pictures of the residences of supposed voters -- graveyards.   So the mnemonic is Can Dead Men Vote Twice.     If you add "at Elections" you get a nice reminder to add easterly variation and deviation when going from compass back to true.   Oh, and "At Wild parties" added to the politically incorrect mnemonic for TVMDC  reminds one to add Westerly variation and deviation.

    Lu


    On 6/4/2014 1:46 AM, Andrés Ruiz wrote:

    Thanks Greg,

    for the variables used, please see screenshot: Magnetic compass
    is it correct to use TC for true course, MT for magnetic, and CC for compass course?
    and other variables.

    best regards,
    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/

    View and reply to this message: http://fer3.com/arc/m2.aspx?i=127901


       
    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