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    Re: Advice concerning sextants
    From: James N Wilson
    Date: 2010 Feb 22, 15:45 -0800

    I've over the years put together some points to consider in buying a
    sextant. I'll offer it here again, just in case it might help.
    Jim Wilson
    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! --
         - remove in rough seas
         - big objective lens for lots of light
      Horizon Glass -- half clear, half silvered; not cut off at edge of
         - 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
      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
      Fine points
         - shade interference with field
         - drum not pinned to shaft
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