One other thing... Tayama and Plath make beautiful instruments, but are four times the price of a Astra IIB, which is a pretty decent, if relatively inexpensive sextant. About $500 retail, less if on sale. The plastic ones can be problematic as they can warp if left in the sun, and the warping is often not very noticeable but will throw your readings way off. Tania Aebi, of Varuna fame, had that problem.
The sextant handbook is a very good book on how to adjust and calibrate a sextant for side error, index error, etc.
Lots of good books on sextant use out there too. Blewitt's Celestial navigation for Yatchsmen is an old fallback. The Complete Celestial Navigator is another good one.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.