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- Master & Mate (Oceans or Near Coastal (Limited Tonnage: Less Than 200 GRT)) »
- Q154 - Navigation Problems: Oceans
162. On 28 October at 1754 ZT, your vessel's DR position is LAT 28° 30' N, LONG 63° 24' W. At this time, you obtain a sextant altitude (hs) of Polaris reading 28° 42.6', with an index error of 2.4' on the arc. Your chronometer reads 09h 50m 00s, and is 4m 14s slow. What is your latitude by Polaris, given a height of eye of 28 feet (8.5 meters)?
The correct latitude is determined by correcting the sextant altitude of Polaris for index error, dip, and refraction, then using the Nautical Almanac's Polaris tables to apply a correction based on the date, time, and longitude.
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