Twenty-four-week course covering use of the sextant, electronic navigation, the Nautical Almanac, sight reduction by formula and scientific calculator, the Pilot and Great Circle charts and more.
On-line tutorial in 16 chapters. Covers all the theory and trigonometry. The practical procedures are included but are definitely not presented for the mathematically challenged. Includes links to almanacs, sight-reduction freeware for the sun and moon,
Brief grab bag of facts and commentary on buying and using a sextant. Contains excerpts from hard-to-find bulletin board and newsgroup postings, as well as links to useful sites and vendor pages.
Fill-in-the-blanks calculator will produce calculated azimuth and altitude from your DR position and the declination and GHA of the celestial body. You need a nautical almanac to use with this information. Not downloadable. Includes an excellent history of celestial techniques for mariners.
The chapters on celestial navigation calculations from the 1995 edition of The American Practical Navigator, originally published in 1802 and updated by NIMA. Chapters 18 - 23, with diagrams and examples, on time, almanacs, and sight reduction - its mathematics, calculations, and errors.