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    Harbor Markers
    From: Eamonn Sparling
    Date: 2018 Nov 24, 13:35 -0800

    Harbour Marker

    I came across this item in an article on celnav on the website tiititudorancea.com.

    " Traditionally, a navigator checked his chronometer from his sextant, at a geographic marker surveyed by a professional astronomer".

    Could the members throw some light on the method referred to here and its history. The marker is also referred to as a "Harbor marker"

    Do any of these markers still exist?

    Eamonn S

    53.3° N  06.3° W

       
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