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frankreed@HistoricalAtlas.net wrote:
> Now there's been no great advance in all these 
> decades in artificial horizons. There's simply no way to get a vertical that 
> is not influenced by the motion of the airplane. 
There is one significant advance that was introduced some ten years ago: 
the FOG (Fibre Optic Gyro). Combined with acceleration sensors these 
produce very high quality motion reference units and even inertial 
navigation systems. Initially developed for military rocket application 
the downgraded versions of these instruments are widely used in 
hydrography and other businesses.

For examples/documentation you can check 
http://www.ixsea.com/en/systems/002.005.001/hydrographic.html and the 
space developments: 
http://www.ixsea.com/en/systems/002.006/_products-space.html

I am a regular user of these systems (and did several performance tests 
with them as well for the Dutch government) and know from experience 
that the direction of the vertical is not influenced by lateral 
motions/accelerations.

Nicol�s



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