On 30 August your 0554 zone time (ZT) position was LAT 25°39.0'S, LONG 31°51.0'E. Your vessel was steaming on course 325°T at a speed of 15.0 knots. An observation of the Sun's lower limb was made at 0836 ZT. The chronometer read 06h 38m 36s and was fast 02m 24s. The observed altitude (Ho) was 30°49.2'. LAN occurred at 1157 ZT. The observed altitude (Ho) was 56°40.0'. What was the longitude of your 1157 ZT running fix?

Question

Accepted Answer

Option D: 30°52.5'E. Advance the 0836 ZT line of position to the time of LAN (1157 ZT) using the vessel's course and speed. The meridian altitude at 1157 ZT provides the latitude, while the intersection of the advanced LOP and the meridian provides the longitude of 30°52.5'E via standard running fix procedures.