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: Symmedian point -earliest reference in navigation
    From: David Pike
    Date: 2018 Oct 14, 15:17 -0700

    Bill Lionheart you wrote:

    I will eventually find a geometric construction for this I expect.

    How about joining the symmedian point to the DR position and splitting it in the ratio of the recognised bands of error of each.  That's roughly what we did in the V Force, but then there weren't many rocks to fly into at 40,000ft plus.  For a single PL we took the perpendicular from the PL to the DR posn, and for 2Pls we took a line from where they crossed to the DR posn.  DaveP. 

       
    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