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: Puzzled by Douglas Protractor Instructions
    From: Michael Koblic
    Date: 2016 Sep 3, 15:32 -0700

    I got the same problem having just discovered a very old Douglas protractor in my library. I found the instructions less than helpful. However, I believe the essential step is to actually draw a bearing line on the map and manoeuvre the protractor so it is lined up with the line ("the left edge") and the nearest meridian (or the grid). Another set of semi-helpful instructions is here:

    http://www.chamberssailing.org/Documents/Manual%20Douglas%20Protractor.pdf

    I am not sure how helpful this book is as it is still downloading :-)

    http://tortolasailingschool.com/wpress/wp-content/uploads/2015/04/ym-offshore-course-notes.pdf

       
    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