Navigation Problems USCG Question #308 (Set 8)

On 16 June 0612 zone time, morning stars were observed. The vessel's position was LAT 27°23.0'S, LONG 56°22.0'W. The vessel is steaming at 16.0 knots on a course of 212°T. A sextant observation of the Sun's lower limb is made at 0850 zone time. The chronometer reads 00h 53m 19s, and the sextant altitude is 22°58.6'. The index error is 2.0' off the arc, and the chronometer error is 02m 43s fast. Your height of eye is 61.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

Official USCG Answer & Rule Citation

Correct Answer: Option A — 044.3°

Determining the azimuth requires calculating the Local Hour Angle and declination of the sun at the time of observation. Using the assumed position and the standard celestial navigation formulas found in Bowditch, the azimuth is calculated to be 044.3°T.

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