NavList:

Alexandre E Eremenko wrote:
>
> Dear Red and Lu:


> A sextant with a stabilized telescope will be able to measure to single
> seconds, like a theodolite.
> Then I would add a stabilized dipmeter, and the whole combination
> of sextant/dipmeter will certainly have performance of
> a GPS:-)

Well, providing it's not cloudy out and there's a clear horizon.   For
all the joy we take in celestial, let's not forget this major problem
with it....


>>"4. Automatic height-of-eye calculation. "
>
>
> Interesting. How do you propose to do this?
> On what principle?

In my original note I speculated on two way to do this -- one by sonar
ranging to the water's surface, the other by actually lowering a device
to the surface of the water.  This would require direct vertical access
to the water such as one would get on a small boat, it wouldn't work on
the bridge of a large ship (unless one is on a full-beam set of wings)
or while taking observations shore-side.

Lu Abel

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