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    Re: Systematic error and its resolution
    From: Geoffrey Kolbe
    Date: 2007 Apr 06, 19:20 +0100

    Sorry Alex, having written the first sentence, I then later amended it, so
    making it incorrect. It is easy to determine the Index Error of a marine
    sextant, but not of bubble sextants.
    
    Apologies for the confusion.
    
    Geoffrey
    
    At 17:24 06/04/2007, you wrote:
    
    
    
    >Geoffrey,
    >
    >How do you determine the index error of a bubble
    >sextant?
    >I understand that some bubble sextants have two
    >optical paths, one of them for the horizon observations.
    >But if I understand correctly what sextant you are using,
    >it does not have
    >this option. So how do you determine its index error?
    >
    >In particular, I don't understand the sentence in your message
    >"can be easily determined at the start of a round of sights".
    >How?
    >
    >Alex.
    
    
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