On 13 November at 0438 ZT, morning stars were observed and the vessel's position was determined to be LAT 22°14.0'S, LONG 79°23.0'E. Your vessel is steaming at 13.0 knots on a course of 242°T. A sextant observation of the Sun's lower limb is made at 0822 ZT. The chronometer reads 03h 20m 16s, and the sextant altitude (hs) is 45°49.7'. The index error is 1.0' on the arc, and the chronometer error is 01m 47s slow. Your height of eye on the bridge is 61.0 feet (18.6 meters). What is the azimuth (Zn) of this sight using the assumed position?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 092.6°T
Apply the intercept method using the Nautical Almanac and Pub. 229. Correct the sextant altitude for index error, dip, and refraction. Calculate the LHA of the Sun based on the corrected GMT. The azimuth angle (Z) is derived from the sight reduction process, then converted to Zn.
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