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Thank you everyone for answering my questions.

The invar question popped into my head when I read of the problems that
Geoffrey had with his A12 in the Sahara. I priced a small (1/4" x 6" x
12")sheet of super-invar at $450.00 US so I can see it has stayed out of
sextants.

I am still enjoying finding sextants on E bay armed with the new
information.  I might just go for a marine sextant, first, and try an
artificial horizon or the dip short method I learned of here.

The Sept Iles bay I wrote of was along the shore of the Gulf of St.
Lawrence in Canada. We were loading coal into a French carrier that
dwarfed our 730 foot lakers. It took 5 of us to fill it up, ans we
carried 28,000 short tons.
We were the first ships to do this type of cargo transfer. It was
interesting but meant no shore time.   Here is a picture link.  I think
my ship, The H.M. Griffith was the outside one. I am the slim good
looking fellow with a full head of hair running the aft winches. :-)
Haven't changed a bit.

http://www.csl.ca/new/suia_08.html

By the way, has RDF disappeared from the marine world?  I searched for
units for small boats and could find any. I thought they might be cheap
and accurate with modern electronics. I found them very useful when
piloting small aircraft in the pre- GPS days.

Any sign of an inexpensive fiber optic gyro on the market yet?  I read,
ages ago, that Hitachi was going to have an OEM one for cars for a cost
of around 100.00 US.  I loved a good ship's gyro as we did all our chart
work in true. The FOG has the same properties without the size.



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