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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q109 - Navigation Problems: Oceans
357. On 5 May at 1953 zone time, you take a sextant observation of Polaris. Your vessel's DR position is LAT 29°30.0'N, LONG 66°25.7'W, and your sextant reads 29°07.2'. Your chronometer reads 11h 51m 45s, and your chronometer error is 01m 36s slow. Your height of eye is 56 feet, and the index error for your sextant is 1.5' on the arc. What is the latitude of your vessel from your observation of Polaris?
The correct latitude is determined by reducing the sextant altitude of Polaris, applying index, dip, and star altitude corrections, and then using Polaris tables based on the date and Local Hour Angle Aries. This process yields a latitude of 2923.6'N.
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