On 31 January your 0920 zone time DR position is LAT 24°16.0'S, LONG 151°33.0'E. Your vessel is on course 258°T at a speed of 18.5 knots. What is the zone time of local apparent noon (LAN)?

Correct Answer: Option D — 1211

Determine the longitude difference between the DR position (151°33.0'E) and the zone meridian (150°E). The vessel is 1°33.0' east of the meridian. Calculating the vessel's movement toward the meridian at 18.5 knots on course 258°T results in a LAN time of 1211, following standard celestial navigation time-keeping.