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- Q127 - Navigation Problems: Oceans
107. On 16 June in DR position LAT 50°57.0'S, LONG 53°03.9'W (ZD+4), you take an ex-meridian observation of Acrux at lower transit. The chronometer time of the sight is 10h 08m 18s, and the chronometer error is 02m 12s fast. The sextant altitude (hs) is 23°49.0'. The index error is 1.1' off the arc, and your height of eye is 26 feet. What is the latitude at meridian transit?
An ex-meridian observation of Acrux, a circumpolar star south of the observer, requires correcting the sextant altitude using ex-meridian tables and applying the lower-transit meridian-altitude relationship Lat = Hmer + 90 — Dec, resulting in a latitude of 5041.2'S.
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