On 29 April your 0530 zone time position was LAT 23°04.0'S, LONG 162°12.0'E. Your vessel was steaming on course 120°T at a speed of 9.0 knots. An observation of the Sun's upper limb was made at 0830 ZT. The chronometer read 09h 27m 32s and was slow 02m 24s. The observed altitude (Ho) was 24°58.0'. LAN occurred at 1205 zone time. The observed altitude (Ho) was 52°04.0'. What was the longitude of your 1200 zone time running fix?

Question

Accepted Answer

Option B: LONG 163°06.0'E. Advancing the 0530 DR position to the time of the LAN observation requires calculating the vessel's run along the course line. Applying the meridian passage longitude correction ensures the 1200 running fix is accurately placed at 163°06.0'E, consistent with standard celestial navigation practices.