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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Traditional navigation by slide rule
    From: John Brown
    Date: 2016 Jan 20, 03:40 -0800

    Bob wrote:

    Podmore's trig scales are set up for degrees and minutes.  Having used those now, I am less convinced that they are better than decimal degrees.   The increments sometimes represent 30', sometimes 20', and sometimes 5', sometimes 2', 1', or 1/2'. A guy has got to think about his audience here... and I think people shift gears mentally to different increments  easier in decimal degrees than degrees and minutes.
    I am with Bob on this, given the attainable precision on a ten inch slide rule.  We don't seem to have a problem with the decimalisation of seconds of arc and mental interpolation.

     BTW, my C Plath sextant has no vernier on the micrometer screw.  I find it uncluttered and very easy to estimate the tenths.  

    John

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    NavList ID 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