Davis Instruments Celestial Navigation Quick Reference CardDavis
Celestial Navigation. A simplified, yet complete Celestial Navigation system. Includes everything you need: sextant use and corrections, starfinder for 18 stars, data entry form, and step-by-step sight reduction and plotting procedures. May be scored and separated; large portion fits in the sextant case for quick reference, and small part acts as a waterproof data reduction card.