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 Maximum Probability Positions
    From: Hewitt Schlereth
    Date: 2013 Mar 25, 19:57 -0700

    Yeah well, as I suspected from the beginning, this is where we part company. I 
    prefer to base the DR solely on two things - course and distance - because 
    they are underpinned by instruments - course by the compass, distance by the 
    log. 
    
    I don't take into account factors like leeway, currents, sea state, etc till I 
    have an LOP. Then and only then, do I judge whether those other factors 
    reasonably account for the gap between DR and LOP. 
    
    Hewitt
    
    
    Sent from my iPad
    
    On Mar 25, 2013, at 7:02 PM, "John Karl"  wrote:
    
    > Hewitt,
    > 
    > As I said it's the best estimate of the the track over ground, which 
    includes all factors that the navigator has available, or cares to use -- 
    course steered, distance logged, currents set & drift, leeway....
    > 
    > Greg,
    > 
    > OK, great.  Then you've used the EPRF that I've been discussing, middle 
    figure in my post 23074.  So then you used that same offset to east to plot 
    the 1100/0900 sun line RFIX.  Right?
    > 
    > If so, then this particular traditional running fix gives good agreement 
    between the estimated-track made-good and the updated LOP.  The estimated 
    position running fix (EPRF) would give the same result in this case.   (They 
    would also agree when the two LOPs are are right angles.)  So I don't get the 
    point.  Are you showing how well the EPRF works?? 
    > 
    > It's when there's a disagreement that the TRF fails and the EPRF gives 
    superior results.  Check the 2nd and 3rd figures in my 23074 post. 
    > 
    > JK
    > 
    > 
    > 
    > ----------------------------------------------------------------
    > NavList message boards and member settings: www.fer3.com/NavList
    > Members may optionally receive posts by email.
    > To cancel email delivery, send a message to NoMail[at]fer3.com
    > ----------------------------------------------------------------
    > 
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=123085
    > 
    > 
    

       
    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