Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: 3 Navaid Visual Fix WAS : Compass Error Correction
    From: Antoine Couëtte
    Date: 2010 Apr 23, 00:23 -0700

    Dear Byron,

    Thank you for your reply.

    Your Article about "Franklin Piloting Technique" is excellent and a very welcome complement to the use of the 2 closest Navaids Intersection as "Best Accuracy available Fix".

    It could be summarized as follows :

    "In the case of a 3 Navaid Visual Fix, and as long as the 2 closest Navaids Intersection (sufficient cut angle required) is CONSISTENT with the LOP derived from the 3rd most distant Navaid, then use this 2 closest Navaids Intersection as your Fix, and as "Cherry on the cake" get an indication on Compass error from the comparison between "observed-true" bearings difference taken from this 3 rd most distant Navaid.


    While Piloting in Danger Waters, when got my early training (1972-1975), and to the best of my knowledge then, the requirement was :

    - one Fix every Five Minutes, and

    - observe only "ahead up to abeam" *** (not to the aft), and

    - Shoot the fastest changing bearing LAST.

    I do not know the current French Navy requirements. I would assume that they have been tightened into some equivalent of your current US NAVY rules.


    Thank you and Congratulations again for the quality and innovation of your practical ideas. They are not just only "theory", and they can be implemented in True World Operations and that is why they are "something of value".

    Best Regards from

    Antoine M. "Kermit" Couëtte, CDR (FN) Ret.

    *** "Ahead up to abeam" : interestingly enough, it is one of the "4 rules" for Low level Airborne Visual Navigation, which I am going to cover in a separate post.

    Last Note : While in exchange in the US Navy as an A7(E) CORSAIR II Pilot, and when not flying at night I most often climbed all the way up to shoot stars on USS John F. Kennedy CV67.

    I recently (re)discovered in my personnal archives some observations made on board this same Aircraft Carrier in September 1986 with QMCS Stevens who was a very nice Gentleman, since for the occasion he had even lent me his own sextant !!! Since the Navy is a "small world" ... maybe you met him also in your carrier ?

    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

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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