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    The future of Celestial Navigation...
    From: Andrés Ruiz
    Date: 2015 Oct 12, 16:22 +0200
    "Celestial navigation positioning methods are not
    reliant on any electronic systems, and the position in
    due accuracy (≤1 NM) can be obtained by using the
    sextant, compass and nautical almanac solely. Lines
    of position (azimuth and distances again) are derived
    by known locations and movements of celestial
    bodies – stars, planets – which are acting as reference
    objects. Astronomical positioning methods are still
    valid check in open sea navigation. However, with
    the rise of new technologies and real‐time
    positioning, there appears a possibility that these
    methods will slowly go into oblivion. The number of
    vessels where sextant is not anymore obliged
    increases, distancing celestial navigation methods
    from the common usage."

    Source: Navigation with ECDIS: Choosing the Proper Secondary Positioning Source

    Andrés Ruiz
    Navigational Algorithms
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