technique
7 min · 29 Mar 2026
From raw sextant angle to a plotted line of position, one worked solar example at a time.
Step-by-step guide to HO 249 sight reduction tables with a worked solar example. Learn to find Hc, Zn, and plot your line of position.
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comparaison
7 min · 29 Mar 2026
Accuracy, speed, weight, and which certifications require which tables.
HO 249 or HO 229? Compare both sight reduction methods — accuracy, speed, and which certifications require which tables.
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recit
6 min · 29 Mar 2026
GPS can fail. The sky cannot. What experienced ocean sailors know about electronic dependence.
GPS can fail at sea. Here's why experienced offshore sailors still practice celestial navigation — and how to start learning.
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certification
7 min · 29 Mar 2026
The six competencies, what the examiner tests, and how to prepare without going to sea first.
Preparing for the RYA Yachtmaster Ocean exam? Here's exactly what celestial navigation skills you need and how to practice them.
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technique
8 min · 29 Mar 2026
The simplest, most reliable celestial observation — and the one every ocean navigator should master first.
The noon sight is the simplest celestial observation. Learn to find your latitude from the Sun's meridian passage — formula, example, and tips.
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