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- Q135 - Navigation Problems: Oceans
110. On 13 October at 1847 ZT, your vessel's DR position is LAT 42°17.4' N, LONG 138°46.2' W. At approximately this time, you obtain a sextant altitude (hs) of Polaris reading 42°16.8', with an index error of 3.2' on the arc. Your chronometer reads 03h 45m 20s and is 1m 32s slow. What is your latitude by Polaris, given a height of eye of 44 feet?
The correct latitude is determined by correcting the sextant altitude for index error, dip, refraction, and then applying the Polaris correction from the Nautical Almanac based on LHA Aries, resulting in a latitude of 4209.1' N.
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