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Here are my two worksheets for the sights on the top two lines of "noon 1a".

The procedure I followed is exactly the same as that on the previous
sheet I submitted for the sights on "noon.xls".  On these two,
however, I summarized the results and the differences between mine and
George's, on two lines in BOLDFACE toward the bottoms of the pages.

For these two runs, the differences were 3.2' and 4.5' in the
Longitudes; 0.9' and 1.0' in the Latitudes.

Hewitt

On 4/24/09, Hewitt Schlereth  wrote:
> George, what I get from this is that the coordinates at the ends of
>  the top two rows of "noon1a" are Lat/Lons of the actual positions from
>  which the (perturbed) Hs's were generated. To me that means they are
>  in the same category as GPS fixes.
>
>  Comparing to GPS was something I was never able to do, because my
>  active sea days were over by the time it was in place. All I had to
>  judge my accuracy by was a DR. Also, my actual use of this
>  equal-altitude method was limited - perhaps a dozen or so times, as I
>  mentioned to Frank once when he asked.
>
>  As far as comparing to DRs goes, the technique gave me the same
>  results as advancing sun-lines did. So I trusted it. These "noon 1a"
>  Lat/Lons, though, give me a better standard- mathematically defined
>  positions - to gauge against.
>
>  So, what I plan to do is find equal (or nearly equal) altitudes from
>  the data in the top two rows of "noon1a" as I did before from your
>  ".xls" spread-sheet and see if the method continues to hold up against
>  what is, in effect, a virtual GPS fix.
>
>  I'll send the two worksheets in my next post.
>
>
>  Hewitt
>
>
>  On 4/24/09, waldendand@yahoo.com  wrote:
>  >
>  >  The DR is N56, W10.
>  >
>  >
>  >
>  >  >  >
>  >
>

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