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    Re: Davis MK III Index Error
    From: Greg Rudzinski
    Date: 2015 May 10, 10:49 -0700

    Herman,

    Pick a vertical tower, pole, or structure a few miles away to observe with the sextant held horizontally. Line things up and read index error on or off arc.

    Greg Rudzinski 

    From: Herman Dekker
    Date: 2015 May 10, 06:56 -0700

    How can you determine index error of a Davis Mark III sextant, if there is no free sight of a horizon? (I am in the backyard, with only a artificial horizon).
    NB:the filters off the horizon "mirror" are very light, so even with sunglasses not possible to look direct to the sun.

    regards,

    HermanD

       
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