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    Re: Navigation IFN
    From: Antoine Couëtte
    Date: 2026 Feb 27, 10:20 +0100
    Au RSL, le 27 Février 2026

    Dear Andrés,


    Wonderful ! and Thank you so much.

    I once had access to a full set of the earlier "IFN Navigation" publications (up until # 122 covering the years (1953 - 1983) - hence I most certainly missed [quite] a few interesting topics published afterwards - and from which I had retained and kept the following paper "earlier" issues:
    - #   55 : (P 319) Space Navigation Fix during a trip between Earth and Moon
    - #   56 : (P 449) Angular Momentum in Space Navigation
    - #   80 : (p 375) Fix from Heights rising velocities
    - #   94 : (p 193) The OMEGA station in La Réunion Island & (P 222) Principles of the Lunar Distances methods
    - # 114 : (p 221) Polar Orientation Azimuth Computer
    - # 117 : (p   81) Azimuth LOP's onboard SSBN's
    - # 121 : (p   39) Kalman Filtering on LOP's , (p 47) Integrated Navigation  Celnav and (p 105) CelNav Suitability of the HP41 Calculator, which I had identified just a couple of years earlier as soon as the HP41 appeared on the Market.
    - # 122 : (p 193) Royal Navy integrated Navigation system  as well as a few other interesting topics
    - # 205 : (p   39) Own Copy courtesy (Fall 2009) of late M. Yves Robin-Jouan, Former NavList Member and Contributor : A Treatment of Singularities with Astronomical Fix using the Method of Coplanar Vertices
    ... and Yes, the " isoazimuthal LoPs " are covered in # 117.

    Thanks again, and

    Best Friendly Regards,

    Antoine

    *******

    Le 27/02/2026 à 08:17, Andres Ruiz a écrit :
    My dear friend Antoine Couëtte will be happy,

    All the numbers of Navigation (Paris) Institut français de navigation, are available for free at https://gallica.bnf.fr/ark:/12148/cb34348918r/date&rk=236052;4

    Years ago we exchanged information that appeared in this publication about isoazimuthal LoPs.

    image.png

    Fair winds and following seas.
    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/

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