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: Today's octant sights
    From: Antoine Couëtte
    Date: 2010 Mar 17, 15:36 -0700

    If no typos again ...


    15:29:10 35°00' +0.0 NM / 132.0°
    15:31:45 35°23' +1.7 NM / 132.6°
    15:33:41 35°38' +0.9 NM / 133.1°
    15:35:49 35°52' -2.4 NM / 133.7°
    15:37:59 36°12' +0.2 NM / 134.3°
    15:39:49 36°27' +0.6 NM / 134.7°
    15:41:54 36°44' +1.1 NM / 135.3°
    15:43:21 36°58' +3.8 NM / 135.7°
    15:45:49 37°13' -0.4 NM / 136.3°
    15:47:33 37°29' +2.3 NM / 136.8°

    What do you exactly call a "rapid-fire" fix ? I do not see how - which such "almost same azimut" shots, we can get anything more than taking the average value of all shots and their average azimut which gives - if no typo again ... - +0.78 NM (i.e. 0.78 NM Towards the Sun in your terminology) and an Azimut of 134.4°. This is already a quite reliably good LOP (actually within less than 1 NM error with an old instrument, but nonetheless ... an experienced observer)

    I would be higly interested to learn how we can deduce extra reliable information here, for example a so-called "fix" ... and what would be the confidence of such fix, or in other words, how would the confidence ellipse look like (quite flat probably ...)


    Thank you and Best Regards


    Antoine M. "Kermit" Couëtte
    ----------------------------------------------------------------
    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