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    Re: Calibrating a Bris sextant
    From: Marty Lyons
    Date: 2017 Aug 14, 06:42 -0700

    Thanks for the help Greg. After seeing your results and drawing myself a sketch, I understand the limb issue.

    I was failing to account for refraction also.

    When at the coast, with a real horizon I see I must account for dip. I think it is unnecessary to account for dip when using the hand level to sight a ficticious "horizon", because my height of eye and the point on the "horizon" are at the same level. 

       
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