At 0600 ZT on 24 July your DR position is LAT 22°37'N, LONG 32°45'W. You are steering 185°T at a speed of 20.0 knots. Determine the computed altitude (Hc) and azimuth (Zn) for an observation of the Sun's lower limb taken at 1030 ZT. At this time the chronometer reads 00h 30m 16s and is 0m 31s slow.

Correct Answer: Option B — Hc 64°41.7' Zn 087.8°

Applying chronometer corrections yields Greenwich Mean Time. Entering the Nautical Almanac with GMT provides GHA and declination. Solving the PZX triangle using an assumed position via Pub. 229/249 generates computed altitude (Hc) and true azimuth (Zn).