On 30 June at 0630 zone time, morning stars were observed, and the vessel's position was determined to be LAT 25°15.0'S, LONG 175°36.0'E. Your vessel is steaming at 16.0 knots on a course of 302°T. A sextant observation of the Sun's lower limb is made at 1015 zone time. The chronometer reads 10h 14m 38s, and the sextant altitude is 32°07.9'. The index error is 4.5' on the arc, and the chronometer error is 01m 25s slow. Your height of eye on the bridge is 58.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Question

On 30 June at 0630 zone time, morning stars were observed, and the vessel's position was determined to be LAT 25&deg;15.0'S, LONG 175&deg;36.0'E. Your vessel is steaming at 16.0 knots on a course of 302&deg;T. A sextant observation of the Sun's lower limb is made at 1015 zone time. The chronometer reads 10h 14m 38s, and the sextant altitude is 32&deg;07.9'. The index error is 4.5' on the arc, and the chronometer error is 01m 25s slow. Your height of eye on the bridge is 58.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Accepted Answer

Option A: 035.3&deg;T. In accordance with Bowditch, dead reckon position forward, convert chronometer to GMT, extract tabular ephemeris data, apply index error and height of eye corrections, and solve the navigational triangle to compute the true azimuth.