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
    Name or NavList Code:
    Re: New compact backup CELNAV system
    From: Martin T
    Date: 2009 Mar 17, 13:09 -0700

    I am another long time lurker, who got all excited about Gary LaPook's flat 
    Bygrave scales, and also got cracking on my own version of scales. 
    Unfortunately it took me a while to complete due to distractions like family 
    and job. So Dave beat me to it by a month or so.
    In any case I decided to publish my version of scales as well. Not because 
    they are better than Dave's, but because they are written in Postscript, and 
    can be easily customized by each individual user. It's easy to change width 
    of scales to the size of your sheet or cylinder, number of lines, font size, 
    frequency and thickness of tickmarks etc. 
    The files cot.ps and cos.ps can be edited with text editor like notepad, and 
    then converted to PDF using free Ghostview tool. To do that you also need to 
    install Ghostscript. Here are links to download page.
    You could even easily define other scales using this template e.g. sec()/csc() 
    for Ageton method like Andrew suggested in one of the previous posts. Though 
    this would require to write up the function in Postscript stack based form 
    using just (sin, cos, and atan) as these are only available trigonometric 
    functions in postscript. I would be glad to help, if somebody decides to do 
    Note that common procedures for drawing the scale are in scale.inc file and it 
    must be in the current directory when opening .ps files with ghostview.
    And I must also repeat Gary's warning, when printing PDF files make sure to 
    set Page Scaling to None. I wasted few transparent sheets before figuring 
    that out.
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To , email NavList-@fer3.com






    Browse Files

    Drop Files


    What is NavList?

    Get a NavList ID Code

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.

    Email Settings

    NavList ID 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