Nailed it in one.
Damn, that didn't take nearly as long as I thought it would.
The New American Practical Navigator was published in 1802 and has NEVER gone out of print. There is at least one copy on every United States Ship. Almost all ship drivers have their own personal copies. I still have mine.
Nathaniel Bowditch
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
https://msi.nga.mil/Publications/APN
The American Practical Navigator, first published in 1802, was billed as the “epitome of navigation” by its original author, Nathaniel Bowditch. The text has evolved with the advances in navigation practices since that first issue and continues to serve as a valuable reference for marine navigation in the modern day.
The publication describes in detail the principles and factors of navigation, including piloting, electronic navigation, celestial navigation, mathematics, safety, oceanography and meterology. It also contains various tables used in typical navigational calculations and solutions, including the formulas used to derive the tabular data. Many of these solutions can also be found using the on-line calculators located in the Nautical Calculators section of this Web site.
The 2019 edition, updated to June 2021, of the American Practical Navigator is published in two volumes, which can be downloaded as complete PDF documents by selecting the hyperlinks below.