On 26 September your 0830 zone time DR position is LAT 23°04.0'N, LONG 129°16.0'E. Your vessel is on course 119°T at a speed of 20.0 knots. What is the zone time of local apparent noon (LAN)?

Correct Answer: Option C — 1210

Calculate the longitude difference between the DR position and the reference meridian. Apply the time-longitude conversion (4 minutes per degree) to the zone time. Adjusting for the vessel's movement toward the sun during the interval yields the local apparent noon time of 1210 zone time.