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    Re: Change in Altitude Tables
    From: Bill Noyce
    Date: 2004 Mar 29, 12:04 -0500

    >  AP 3270, the British equivalent to HO 249 has a set of tables called
    > "Altitude Corrections for Change in Positon of Observer". The entry
    > arguments are ground speed in knots and relative bearing of the
    observed
    >  body. It's a neat little table except it is of no use for marine
    > applications because the lowest speed given is 50 knots.
    >
    > Robert
    
    If you look closely at the table, you'll see the entries in any row
    are directly proportional to the speed (though the rounding to whole
    minutes obscures this slightly).  Thus, you can simply divide both
    the speed and the correction by some convenient factor (ten?) for use
    on a boat.  In other words, you can pencil in decimal points in the
    speed headings and the table entries in the top table.
    
            -- Bill
    
    
    

       
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