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Sight Reduction Tables Required books for celestial navigation that last indefinitely as they are just tables of mathematical solutions to the navigational triangle. There are several styles available, the most popular amongst sailors are Pub. 249 Volumes 2 and 3 (used in this course). The set called Pub. 229 is used on USCG exams and by the Navy. For back-up or a viable alternative for your primary tables, the Davies Tables (now called NAO Tables) are the best bet. Regardless of the table style, however, all do the same job: you tell the tables three numbers (LHA, dec, a-Lat) and the tables tell you two numbers (Hc and Zn). Programmed calculators will do what these tables do, but you still need some set of tables on board to back-up the calculator. See Pub. 249, Pub. 229, Davies Tables, Navigational Triangle, and Calculators. Abbreviation:  SR Tables

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