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- Q135 - Navigation Problems: Oceans
150. On 16 February your 1845 ZT DR position is LAT 25°50.5'N, LONG 46°24.0'W. At that time, you observe Polaris with a sextant altitude (hs) of 26°25.5'. The chronometer time of the sight is 09h 47m 30s and the chronometer error is 02m 16s fast. The index error is 2.5' off the arc, and the height of eye is 55.0 feet. What is your latitude by Polaris?
The correct latitude by Polaris is 2538.0'N, determined by correcting the sextant altitude, accounting for index error and height of eye, calculating the Greenwich Hour Angle of Aries, and applying the Polaris correction from the Nautical Almanac.
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