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: The Geometry of Elliptical Probability Contours for a Fix using Multiple Lines of Position
    From: James F Campbell
    Date: 2019 Aug 16, 11:57 -0700

    I should like to know how to obtain a copy of the subject article.

    I was a member of the R.I.N. for years and finally gave up membership when the price got to be a wee bit to high.

    I have an interest in the subject because I share responsibility for a Search and Rescue Course based on the manual method outlined in Volume 2 of the International Aeronautical and Maritime Search and Rescue Manual (IAMSAR). When a mariner in distress gives a Rescue Coordination Center (RCC) their position, an error factor is assigned to that positon.  That factor, along with others, is used in the computations that lead to developing the Search Area into which a Search and Rescue Unit (SRU) is deployed. A position based on two Radio Direction Finding (RDF) bearings is a doozy to solve; see appendix Q Bowditch 1977 and 1984, volume 1 and the 2017/2019 Bowditch, Chapter 3, volume 2. The Admiralty Manual of Navigation, Chapter 16 and appendices thereto, give a 'quick and dirty' error calculation. But it has deficiencies when contrasted to the 95% ellipse that the Bowditch formulae give. A three bearing solution - well that sounds very interesting (apologies to Arte Johnson!

    James F. Campbell
    Instructor

    U.S. National SAR School

       
    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