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>  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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