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: fix with the noon shot...
    From: Tony S
    Date: 1997 Oct 28, 7:20 PM

    PULEEZE ...folks!
    
            This same proposition (in many cases nicely thought out
    _in theory_) is proferred about every three months on this very list.
    
            I offer for your learned consideration:
    
            1. If a true "fix" were possible, it would be heralded in any
            and every navigation text you might have ever read.
    
            1a. A fix by definition is the most accurate position that
            can be attained by the navigator by (in this case) celestial
            means.
    
            1b. The sloppy navigator can, of course, obtain a _rough_
            _estimate_ of longitudinal position by making many compromises.
            If he has not the slightest idea of his longitude, it is better
            than nothing (Chuck was on the mark here with lifeboat nav).
    
            2. While theoretically possible, EVERYTHING near LAN depends
            on _absolute_ accuracy of the sextant altitude sight, time and
            related factors.  (delta declination, North/South, East/West
            sailing tracks are _only_ a very _minor_ part of the equation).
    
            The best method is to bow to well proved practices of
    well time-spaced running fix ...then one can call it an "Rfix".
    (But, still certainly not as good as a true celestial fix).
    
            Sorry to be so didactic, but the proposition keeps
    coming up as earlier mentioned ...with some folks proferring "a new
    revalation".
    
            Everything depends on what measure of innacuracy _you_ are
    willing to accept.  SURELY, NO ONE would accept such rough
    approximations in approaching atolls or landfall!
    	A Navigator's well kept DR since last true fix is very
    probably much better.
    
            Wasted words?  I hope not!  Bye.
    
            Tony    San Francisco, CA
                    (Home of NAVIG94)
    
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
    =-=  TO UNSUBSCRIBE, send this message to majordomo{at}ronin.com:     =-=
    =-=      unsubscribe navigation                                         =-=
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
    

       
    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