Walt writes:

That wasn't my point. I thought you were interested in navigation. Try
reading Dava Sobel's _Longitude_. Fascinating read if you're really
interested in navigation, whether 300 years ago or present time.

I did read it, but it talked too much about politics and other
matters, and not enough about technical stuff.

Nice putdown.

How so? I was alluding to the fact that some things in aviation have
not changed.

I gave you some tantalizing clues about navigation. Pursue them or
ignore them. Up to you.

At the moment I don't have time to investigate them, but I'll keep
them under consideration.

--
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