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- Master & Mate (Oceans or Near Coastal (Limited Tonnage: Less Than 200 GRT)) »
- Q159 - Navigation Problems: Oceans
35. On 11 March your 1846 zone time DR position is LAT 25° 05.7' N, LONG 124° 29.0' W. At that time you observe Polaris with a sextant altitude (hs) of 25° 59.1'. The chronometer time of the sight is 02h 44m 01s, and the chronometer error is 02m 15s slow. The index error is 3.9' on the arc, and the height of eye is 42.7 feet (13.0 meters). What is your latitude by Polaris?
The latitude by Polaris is 2517.9' N. This result is obtained by correcting the sextant altitude for index error, dip, refraction, and then applying the Polaris table correction based on the date, time, and LHA Aries.
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