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: Where is the Prime Meridian?
    From: David C
    Date: 2021 Dec 10, 22:53 -0800

    The preface to the 1983 edition of Nories Tables includes the following comment about the Ports of the World section:

    "Over 6,000 entries were needed for the 4,000 ports, the position of each being checked on the chart."

     In the pre-gnss era  the questions 'what chart' and 'what datum' probably did not arise. Norie gives the lat and long to  one moa which I assume is adequate to locate an unknown port any where in the world. Raper (1906)  has a list of maritime positions rather than Ports of the World. That probably explains why Raper includes Elephant Island, South Georgia and Castle Point but Norie does not.

    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