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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q109 - Navigation Problems: Oceans
223. On 22 July at 0448 ZT, morning stars were observed, and the vessel's position was determined to be LAT 21° 43.0' N, LONG 158° 39.0' E. Your vessel is steaming at 21.0 knots on a course of 028° T. A sextant observation of the Sun's lower limb is made at 0956 ZT. The chronometer reads 10h 54m 27s, and the sextant altitude is 54° 28.2'. The index error is 1.5' off the arc, and the chronometer error is 01m 38s slow. Your height of eye on the bridge is 56 feet. What is the azimuth (Zn) of this sight using the assumed position?
The correct azimuth of the Sun sight is determined by reducing the sight from an assumed position, using the Sun's GHA and declination obtained from the Nautical Almanac, and accounting for latitude, declination, and local hour angle. The resulting azimuth is 086.9 T.
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