The sextant, the noon sight, the sun line, and the star fix — practical guides to celestial navigation for sailors who want to go offshore prepared. Honest about the difficulty. Worth it.
The honest case: GPS is reliable, so why bother? Because celestial navigation is intellectually satisfying, makes you a better navigator, and when a lightning strike fries every instrument you own, it is the only thing that gets you home.
The index mirror, the horizon mirror, the arc, the micrometer drum — how a sextant brings the sun down to the horizon, why time is as critical as angle, and which instruments are worth your money.
Local Apparent Noon gives you latitude directly — no sight reduction tables, no complex calculation. The easiest and most useful celestial observation, and the one every offshore sailor learns first.
Beyond the noon sight: morning and afternoon sun lines, the intercept method, HO 249 sight reduction, the running fix, and the three-body star fix that gives you a triangle and real confidence in your position.