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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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