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: Death to the Intercept Method!
    From: David C
    Date: 2017 Jan 19, 11:37 -0800

    What is particularly interesting is that although Blackburne considers  the "New Navigation" a great improvement  he continues to promote  Sumner methods. The cynic in me says that is because he had devoted a significant proportion of his off-duty hours to calculating his tables and naturally he wanted to sell his books. Blackburne's books include many pages of testimonials from both RN and merchant navy officers. I have attached an example.

    Maybe some navigators had an aversion to plotting intercepts. The advantage of the Improved Sumner Method (according to Blackburne) was that  position could be determined by calculation rather than by plotting. The calculations could be done by plane trigonometry or - perhaps more importantly - by Blackburne's tables.

       
    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