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- Q127 - Navigation Problems: Oceans
248. On 3 January your 1759 zone time DR position is LONG 60°53.2' W. At that time you observe Polaris with a sextant altitude (hs) of 22°55.8'. The chronometer time of the sight is 09h 57m 10s, and the chronometer error is 02m 26s slow. The index error is 2.9' off the arc, and the height of eye is 52.5 feet. What is your latitude by Polaris?
The latitude is determined by correcting the sextant altitude of Polaris for index error, dip, refraction, and then applying the Nautical Almanac's Polaris correction, which is approximately -40'.
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