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    Re: A12 vs A8-A sextants
    From: Paul Hirose
    Date: 2020 Apr 27, 10:21 -0700

    On 2020-04-25 12:00, Geoffrey Kolbe wrote:
    > the bubble image is sharp and clear on the A8-A and there are a couple of 
    vertical tramlines up through the bubble chamber to help you centre the image 
    and bubble in the bubble chamber
    
    US Air Force Manual 51-40 ("Air Navigation") says best accuracy is
    achieved when the bubble and body are near the vertical centerline.
    Error increases as you depart from that line even if the sight picture
    looks good.
    
    http://sofajpl.com/airnav/index.html#COLLIMATIO
    

       
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