On 10 January at 0550 ZT, morning stars were observed, and the vessel's position was determined to be LAT 25°16.0'N, LONG 123°18.0'W. Your vessel is steaming at 22.0 knots on a course of 295°T. A sextant observation of the Sun's lower limb is made at 0915 ZT. The chronometer reads 05h 14m 02s, and the sextant altitude is 24°00.7'. The index error is 2.6' off the arc, and the chronometer error is 01m 34s slow. Your height of eye on the bridge is 55.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Question

On 10 January at 0550 ZT, morning stars were observed, and the vessel's position was determined to be LAT 25&deg;16.0'N, LONG 123&deg;18.0'W. Your vessel is steaming at 22.0 knots on a course of 295&deg;T. A sextant observation of the Sun's lower limb is made at 0915 ZT. The chronometer reads 05h 14m 02s, and the sextant altitude is 24&deg;00.7'. The index error is 2.6' off the arc, and the chronometer error is 01m 34s slow. Your height of eye on the bridge is 55.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Accepted Answer

Option C: 131.9&deg;T. Following standard celestial navigation practices outlined in Bowditch, update the DR position for run time, determine GMT, apply corrections to sextant altitude, and solve the navigational triangle to determine the precise azimuth (Zn).