CELESTIAL-L2.3

Altitude corrections

CELESTIAL-M2 · The sextant and the corrected altitude · CELESTIAL-M2-A The instrument, its errors and adjustment, taking a sight at sea, and turning sextant altitude into true altitude.

Sextant altitude to true altitude in two stages: **Hs to Ha** (index error and dip), then **Ha to Ho** (refraction, semi-diameter, parallax). Worked for our morning sun: +9.7' in total.

Independent study. xplor is not an accredited training provider and awards no certificate or Certificate of Competency. The MCA 'Celestial Navigation' examination must be sat at an MCA-approved examination centre, and the Yachtmaster Ocean certificate is awarded only by the RYA after its own oral and written examination. AI-drafted content pending subject-matter-expert review.