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Andres wrote-

"If you print the plot on a printer without the "fit to page" option, the
angles, Z, are OK and distances are in scale. Do you have done this?
I cannot see any circle of position on the plot, are confused with the
confidence ellipse?"

Yes, indeed I was confused with the confidence ellipse. As I explained, I
could find no way to plot it on a printer. It appeared only as a picture on
my screen, not as a separate attachment, but included within the message in
Outlook Express. There was an attachment, "NavList_5388.obs (231 bytes)",
but I could find no way to open that. There was no way I could alter the
aspect ratio of that picture. If the x and y axes were indeed intended to
plot as equal scales in miles, then it's easier to understand. But on my
screen, they didn't plot that way, and so even if the error ellipse had been
in reality a circle, it wouldn't have shown up as one: therefore angles were
significantly distorted.

Thanks to Andres for making the intention clear.

George.

contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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