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: Updated Transcript of Worsley's Log
    From: David C
    Date: 2017 Jan 25, 22:51 -0800

    Finally it was pointed out that by 1916 time sights were obsolete and had been replaced by intercept-azimuth LoP’s. Any thoughts as to the practicality of using the modern approach would be in a small boat in heavy seas while lying on a pile of ballast rocks?

    Nicholls's Concise Guide to Board of Trade Examinations 1917  is a guide to what British mariners were being taught in that period. Of course it does not prove what methods they were actually using. I have attached the contents pages from the 1917 Nicholls's.

    Note that the seaman were taught long by chron, meridian altitudes and sumner's method. Looking in the book the latter method was Sumner's chord (four point method). Position was found by plotting.  They were not taught intercept-azimuth LoP's. This is consistant with Blackburne's complaint (discussed in the Understanding a 1902 Sumner thread) that the Board of Trade did not examine candidates on either the alt/azimuth sumner or the Mark St Hilaire method.

    Changing the subject - what is the difference between a First Mate and an Only Mate?



    File:



    File:



       
    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