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- Q135 - Navigation Problems: Oceans
341. On 30 March in DR position LAT 20°26.2'N, LONG 131°17.9'E, you take an ex-meridian observation of the Moon's lower limb at upper transit. The chronometer time of the sight is 10h 36m 02s, and the chronometer error is 02m 06s slow. The sextant altitude (hs) is 48°21.4'. The index error is 2.0' on the arc, and your height of eye is 40 feet. What is the latitude at meridian transit?
The correct latitude at meridian transit is 2031.9'N, determined by correcting the sextant altitude for index and dip errors, applying Moon corrections from the Nautical Almanac, converting to a meridian altitude using ex-meridian tables, and then applying the latitude-declination-zenith-distance relationship.
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