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: Lies, damn lies, and statistics...
    From: Jeremy C
    Date: 2013 Mar 19, 02:53 -0700

    Gary,

    I would qualify this. Make sure that you have high confidence in those two lines you shoot. I can "feel" when a line is good when I shoot it. I hope that others do as well. I therefore weigh those LOP's much heavier than others. If you shoot 2 LOP's (be them celestial or terrestrial) and you muck one of them up, you can be way off.

    I am one of those people who don't know statistics except in the broadest of terms. To compensate for this at sea, I remind myself that the celestial fix is approximate at best, and I know about what error of position I can expect based on the stars I manage to observe and the environmental conditions present at the time.

    This same concept flows through my thinking on all fixes. Celestial being the least accurate, followed by visual bearings, then radar ranges, and finally GNSS which can be further subdivided by things such as WAAS, DGPS, or multi-system (L2) receivers.

    While I applaud people's efforts to use statistics to boost fix confidence, I am well aware of the limits of precision and accuracy of the various means to determine position.

    Jeremy
    ----------------------------------------------------------------
    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
    ----------------------------------------------------------------

       
    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