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    Re: A little cel nav in practice
    From: Jeremy C
    Date: 2022 Nov 29, 06:32 -0800

    Hi Frank,

    Would height of eye affect the accuracy, viz a viz distance to the horizon?  I see that his dip of -4' or so is consistant with the HoE of a Tanker bridge.  For the containership I'm on, my dip is usually closer to -9' which means a far more distant horizon.

    I am attaching a moonlight fix I did at the equator one time.  Fix error is about 2.5 nm, which is generally decent for a at sea position, but falls well short of my normal fix error of <1 nm.  The interecepts are also exceptionally high.

    I won't speak for other navigators, who may certainly have better eyes and/or skills than I do, but I have made enough observations at low altitudes to know they don't work well for me from the ships I've sailed on.



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