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    Re: Obtain a fix when you don't have an clear AP?
    From: Andrés Ruiz
    Date: 2015 Jan 11, 12:43 +0100
    Stan, do not worry about the discrepancies.
    If full correction is used for Hs to Ho: oblateness, augmentation,...
    And the correct UT1 is taken into account:
    The solutions is:
     47º 28.9' N
    122º 14.0' W
    by vector solution and by MSH LoPs after 2 iterations if AP(47N, 122W)

    20/02/2010
    17:26:26 UT1

    Be = 47.000000 º =  47º  0.0'
    Le = -122.000000 º = -122º  0.0'

    ALMANAQUE NAUTICO - NAUTICAL ALMANAC
    Sun
    GHA = 78.183753 º =  78º 11.0'
    Dec = -10.773904 º = -10º 46.4'
    SD  = 16.174109 '
    HP  = 0.148219 '

    CORRECCION DE LA ALTURA - ALTITUDE CORRECTION
    Limb: upper 
    Ref: Artificial Horizon 
    Hs = 40.3033 º =  40º 18.2'
    ie = 0.0000 '
    heas = 0.0000 m
    T = 10.0000 ºC
    P = 1010.0000 hPa
    Hoi = 20.1517 º
    dip = 0.0000 º
    Ha = 20.1517 º =  20º  9.1'
    R = 0.0441 º
    OB = -0.00000612 º
    HP = 0.0025 º
    PA = 0.00231297 º
    SD  = -0.2696 º
    Aug = -0.00000400 º
    SDag = -16.174349 '
    Ho = 19.8403 =  19º 50.4' 

    21/02/2010
    00:16:02 UT1

    Be = 43.316667 º =  43º 19.0'
    Le = -2.000000 º =  -2º  0.0'

    ALMANAQUE NAUTICO - NAUTICAL ALMANAC
    Sun
    GHA = 180.591654 º = 180º 35.5'
    Dec = -10.671327 º = -10º 40.3'
    SD  = 16.173132 '
    HP  = 0.148210 '

    CORRECCION DE LA ALTURA - ALTITUDE CORRECTION
    Limb: lower 
    Ref: Artificial Horizon 
    Hs = 24.0733 º =  24º  4.4'
    ie = 0.0000 '
    heas = 0.0000 m
    T = 10.0000 ºC
    P = 1010.0000 hPa
    Hoi = 12.0367 º
    dip = 0.0000 º
    Ha = 12.0367 º =  12º  2.2'
    R = 0.0742 º
    OB = -0.00000209 º
    HP = 0.0025 º
    PA = 0.00241376 º
    SD  = 0.2696 º
    Aug = 0.00000242 º
    SDag = 16.173278 '
    Ho = 12.2345 =  12º 14.1' 

    Imágenes integradas 1

    Imágenes integradas 2
    solution and by MSH LoPs if AP(47N, 122W)

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

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