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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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