The Sextant Handbook The Sextant Handbook Adjustment, Repair, Use and History by Bruce Bauer

Here is the indispensable reference that should accompany the sextant aboard.

Cmdr. Bruce Bauer, a professional navigator and master mariner with the U.S. Merchant Marine, has distilled years of hands-on experience into an eminently readable guide to buying, adjusting, using, and repairing sextants.