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    Re: Extremely poor conditions??
    From: Bill B
    Date: 2012 Mar 22, 01:50 -0400

    On 3/21/2012 4:51 AM, Marcel Tschudin wrote:
    > It would be interesting to estimate the size of this bias from
    > measurements. I expect this error to be negligible for measurements at
    > sea but larger for measurements made further inland.
    
    Thank you Marcel and others. I am out of my depth standing in a water
    puddle in a parking lot when it comes to lapse rates etc.
    
    Half my observations over the past five years have been taken from a
    light or medium displacement sailboat on the lake, which given my
    abilities are less precise and accurate than AH or shore
    observations--until now.
    
    I did mention to Alex off list I wish we could have made observations
    five miles off shore and see how they compared. I have seem some
    extremely strange conditions from shore and near shore, but nothing like
    this offshore.
    
    Even with a horrible horizon offshore, I can usually get intercepts
    within 5' to 7' of the GPS position (even with my first DIY cardboard
    sextant), which realistically is adequate to make ones away across an
    ocean, but not good feedback for techniques--nor a confidence builder.
    
    Again, I plaudit Alex for using many wretched horizons yet obtaining
    usable ocean intercepts, and pursuing answers to what he could not
    fathom as possible like a pit bull with mailman's leg in his jaws ;-)
    
    Bill B
    
    
    
    
    

       
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