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Very interesting, Paul.

In my limited experience I have never met a sextant that provides for a means 
of disengaging the gear rack while in storage, as this spec calls for.

The requirement for accuracy of +-8 seconds along the entire arc would seem to 
exceed that guaranteed by any manufacturer, even C&P only guarantee 9 seconds 
for the Horizon Ultra.

They don't offer LED illumination, either, they still use a tungsten bulb.

For what it is worth, the Annapolis (USN) 44's specify a Cassens & Plath 
Horizon Ultra as a standard piece of equipment carried on board.

I wonder if any commercial sextant can actually meet the specifications. If 
none can, then any manufacturer with any instrument can obtain a special 
contract as the "sole available source" with the standard itself actually 
waived, I believe.

   

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