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    Re: Table A4 + elevation?
    From: Marc Bernstein
    Date: 2003 May 3, 10:14 -0400

    The sight reduction tables for air navigation do have refraction tables. The
    altitudes are listed in 5000' increments up to 55,000' and there is a
    correction table for non-standard temperatures that goes from +47 to -95 C!
    
    For 2100' and 20C, a little interpolation shows you need to subtract about
    1.5' from Hs
    
    
    

       
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