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    Re: U.S. government sextant specification
    From: Jared Sherman
    Date: 2003 Jan 9, 18:12 -0500

    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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