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    Re: 3 sights SR example
    From: Andrés Ruiz
    Date: 2017 Jun 30, 10:21 +0200

    The discrepancy between the cross of the two LoPs obtained with a plastic sextant and the position, was more or less as in “201508 summer fix.png”, and it was in the summer of 2015.



     


    Imágenes integradas 1


    Systematic Errors could be:

    ·         In the observed altitude. (Here simulated)

    ·         Uncertainty in deck-watch. (No)

    ·         Inherent in the method by which the sight is worked. (Here, I gave enough data accuracy)

    ·         In the reckoning between observations (Here SOG = 0)

    And are the same for all LoPs .



     

    Date

    UT

    Star

    GHA

    Dec

    Ho

    20/02/1990

    06:39:15

    Sirius

    148º 34.2'

    16º 42.2' S

    57º 58.6'

    20/02/1990

    06:40:54

    Capella

    171º 10.3'

    45º 59.6'

    32º 28.1'

    20/02/1990

    06:42:34

    Pollux

    134º 23.9'

    28º 3.1'

    30º 17.9'

     MSH intercept:

    Z

    p

    p [nm]

    Sirius

    103.4

    0.3347

    20.1

    Capella

    8.4

    0.5426

    32.6

    Pollux

    48.1

    0.5228

    31.4

     


    The Fix is:

    11º 06.1' S

    178º 35.6' E

    Distance( MSH solution, Fix ) = 22.3 nm



    Any attempt?



    regards,

    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/

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