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.

Question

At 0600 ZT on 24 July your DR position is LAT 22&deg;37'N, LONG 32&deg;45'W. You are steering 185&deg;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.

Accepted Answer

Option C: Hc 64&deg;41.7' Zn 087.8&deg;. Per Bowditch methods, advance the DR position for the run interval, determine GMT, extract GHA and declination from the Nautical Almanac, apply altitude corrections, and solve the navigational triangle to obtain computed altitude (Hc) and azimuth (Zn).