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- Q135 - Navigation Problems: Oceans
187. On 18 October at 0518 ZT, morning stars were observed and the vessel's position was determined to be LAT 25° 31.0' N, LONG 146° 29.2' E. Your vessel is steaming at 19.0 knots on a course of 308° T. A sextant observation of the Sun's lower limb is made at 0915 ZT. The chronometer reads 11h 17m 11s, and the sextant altitude (hs) is 34° 51.4'. The index error is 2.0' off the arc, and the chronometer error is 01m 57s fast. Your height of eye on the bridge is 54.0 feet. What is the azimuth (Zn) of this sight using the assumed position?
The correct azimuth is 125.5 T, determined by accurately advancing the vessel's position, correcting chronometer error, and using the Nautical Almanac to find declination and local hour angle. Incorrect answers result from errors in these steps, such as mishandling time, using an incorrect assumed position, or misinterpreting the Nautical Almanac.
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