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    Re: Advice on Sextant
    From: James N Wilson
    Date: 2009 Aug 3, 16:46 -0700

    Peter:
    
    I give out the following to my students from my learning about various
    sextants to help them choose.
    
    Jim Wilson
    
    
                                                     J. N. Wilson, SN
                                                               Balboa
    
    THE SEXTANT -- as seen by the small boat sailor
    
       Size -- small ones stow easily -- accuracy O.K.
       Telescope -- less than 4 power; 2x to 3x recommended:  6-7X -- NO! --
    12X??
         - remove in rough seas
         - big objective lens for lots of light
       Horizon Glass -- half clear, half silvered; not cut off at edge of
    mirror
         - large -- big round ones better (disadvantage of small sextant)
         - half silvered -- sometimes difficult to see horizon
       Vernier on micrometer drum -- not required
         - accuracy doesn't warrant
         - can lead to reading errors
       Shades -- all O.K. -- polarized may be easier or quicker
       Feel -- weight, ease of movement, etc. -- try it!
         - weight -- some heavy, [steadier] -- some light, [less fatigue]
         - personal preferences govern
       Built-in Light -- very handy, can be used to illuminate forms and
    watch
       Bubble Sextant -- no good for sights from boat
         - O.K. with natural horizon
       Astigmatizer -- I don't use
         - hard to hold body in field
       Plastic -- O.K., good spare -- accuracy questionable, but probably
    O.K.
       Fine points
         - shade interference with field
         - drum not pinned to shaft
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