On 11 October at 0516 ZT, morning stars were observed, and the vessel's position was determined to be LAT 23°21.0'N, LONG 139°27.0'W. Your vessel is steaming at 14.0 knots on a course of 293°T. A sextant observation of the Sun's lower limb is made at 0927 ZT. The chronometer reads 06h 30m 21s, and the sextant altitude (hs) is 39°48.7'. The index error is 2.0' on the arc, and the chronometer error is 02m 56s fast. Your height of eye on the bridge is 63.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Question

On 11 October at 0516 ZT, morning stars were observed, and the vessel's position was determined to be LAT 23&deg;21.0'N, LONG 139&deg;27.0'W. Your vessel is steaming at 14.0 knots on a course of 293&deg;T. A sextant observation of the Sun's lower limb is made at 0927 ZT. The chronometer reads 06h 30m 21s, and the sextant altitude (hs) is 39&deg;48.7'. The index error is 2.0' on the arc, and the chronometer error is 02m 56s fast. Your height of eye on the bridge is 63.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Accepted Answer

Option B: 123.4&deg;T. Determine GMT from the chronometer reading and error. Extract GHA and Dec from the Nautical Almanac. Calculate LHA using the assumed longitude. Utilize Pub. 229 to find the azimuth angle (Z) based on the AP latitude and LHA, then convert to the true azimuth (Zn) of 123.4°T.