John Karl's book is very good. My favourite is 'Self-contained Celestial Navigation with HO 208' by John Letcher. It's out of print but used copies show up on

John Karl's book is very good. My favourite is 'Self-contained Celestial Navigation with HO 208' by John Letcher. It's out of print but used copies show up on abebooks for a reasonable price at times. It's often recommended. I also like 'The Sextant Handbook' by Bruce Bauer. Also out of print. A very nice modern coffee-table book about the history of celestial navigation is 'Finding Longitude' by Richard Dunn e.a. : http://www.amazon.com/dp/B00HPMW95A http://www.amazon.com/dp/B00HPMW95A Finally, you could subscribe to NavList at fer3.com. There's enough in the archives to fill several books and the people there really know their stuff (well, not me so much, but others do!).