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George H, you wrote:
"If they have somehow succeeded in disentangling the "downward G force" from
all the other accelerations that apply to a sextant in a vessel in waves on
the sea, then there may be a future in it. But I doubt if they have. "

There are devices which can measure the local tidal field (which can
distinguish gravitational "down" from local accelerations, see, e.g.,
http://www.bellgeo.com/tech/measurements.html), but the device mentioned
earlier sounds like a relatively simpler electronic "level" built around a
set of accelerometers. And of course, electronic levels, just like ancient
fluid-based levels, detect the sum of the gravitational acceleration and the
acceleration of the observer (relative to an inertial frame).

 -FER

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