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Thanks for the opportunity of amending the below: '... have tables accurate to 2
decimal places for each minute of arc for Meridional Parts ... etc'

As to Meridional Parts, the 1984 Bowditch has tables for M PARTS to one decimal
place for each minute of arc, my 1983 'Norrie's Nautical Tables' has them to 2
decimal places. Its important to realize that different tables may be based on
different spheroid models, and thus give slightly differing values.

As to M DISTANCES, if Bowditch has them its news to me, and welcome news if they
have been calculated to minutes of arc.


Chuck Taylor wrote:

> >
> > Although I have tables accurate to 2 decimal places for the Meridional
> > Parts, the Meridional Distances come only in whole degrees, so need to
> > be interpelated for in-between values.
>
> Peter,
>
> Bowditch has tables of Meridional Parts to quite a number of decimal places.
> The method for computing distances using Meridional Parts is called "Mercator
> Sailing" and is also described in Bowditch.
>
> The introduction to the tables in Bowditch gives a formula for computing
> Meridional Parts.  I have programmed this into a calculator.  One could also
> program it into a spreadsheet.  If memory serves me correctly (I'm away from my
> home library) there is a typo in the formula in Bowditch 95, but Bowditch 80/84
> Volume 2 has it right.
>
> Best regards,
>
> Chuck Taylor
> Everett, WA, USA

   

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