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
    Zenith Fixes
    From: David Pike
    Date: 2019 Mar 21, 15:41 -0700

    Andres you wrote:

    for example in:
    Navigation and Piloting. Dutton. 14th ed. ISBN: 0-87021-157-9

    Manual de Navegación. Martínez Jiménez, Enrique, 1978. ISBN: 84-400-5327-4

    Manual de Nautica https://sites.google.com/site/navigationalalgorithms/Home/books
    ...
    http://fer3.com/arc/m2.aspx/Exercise-16-High-Altitude-Sights-near-Noon-Andr%C3%A9sRuiz-jul-2008-g5897
    The high_altitudes.obs file is an example that comes with my Navigation software. See high_altitudes.png


    Actually, all I was asking was, have I seen these fixes called ‘Zenith Fixes’, or did I just dream that name up?  Thanks anyway for showing me how your esteemed software deals with such fixes.  I’m afraid ‘digital’ is a bit above my pay grade.  I think Bill Lionheart was suggesting something like the first photo below done using chart and dividers.  Unfortunately, my fix position doesn’t quite fit with that given by your software.  That’s mainly because I thought I could get away with ignoring convergence; I couldn’t.  After tweaking my diagram to make latitude grow by approximately 63/60 I was nearer but still not correct.  Then I noticed your fix time was 12.00 not 11.21. After moving my position 39 minutes at 12 kts along 164 degrees, my position was about 1nm away from your digital one (see messy photo).  DaveP

    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