On 4 January your 0800 zone time DR position is LAT 25°25.0 S, LONG 16°09.0'W. Your vessel is on course 290°T at a speed of 13.5 knots. What is the zone time of local apparent noon (LAN)?

Correct Answer: Option D — 1213

Determine the longitude difference between the DR position and the reference meridian. Convert the difference to time (15° = 1 hour). Since the vessel is moving west, add the time difference to the 1200 zone time to find the Local Apparent Noon (LAN) at 1213.