John Karl&#x27;s book is very good.<p>My favourite is &#x27;Self-contained Celestial Navigation with HO 208&#x27; by John Letcher. It&#x27;s out of print but used copies show up on abebooks for a reasonable price at times. It&#x27;s often recommended.<p>I also like &#x27;The Sextant Handbook&#x27; by Bruce Bauer. Also out of print.<p>A very nice modern coffee-table book about the history of celestial navigation is &#x27;Finding Longitude&#x27; by Richard Dunn e.a. : <a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;dp&#x2F;B00HPMW95A" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;dp&#x2F;B00HPMW95A</a><p>Finally, you could subscribe to NavList at fer3.com. There&#x27;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!).