Celestial Navigation Episode 9: The Sextant - Refraction, Semi-diameter and Parallax - YouTube
Illustrations of sextant and other navigational equipment. 'Tables de Navon Pl.11.' Fig.10 to 23 | Royal Museums Greenwich
Sextant: Why it Works and How to Use it
Understanding Marine Sextant - Principle, Readings and Maintenance
Celestial navigation series, part six - Ocean Navigator
GPS Backup with a Mark 3 Sextant: All Instructions and Tables Included; For Any Ocean, on Any Date; No Background in Celestial Navigation Required.: Burch, David, Burch, Tobias: 9780914025603: Books - Amazon.ca