On 12 June your 0400 ZT DR position is LAT 22°31.0'N, LONG 31°45.0'W. You are on course 240°T at a speed of 16.5 knots. What will be the zone time of sunrise at your vessel?

Correct Answer: Option C — 0523

Find the sunrise time for the DR position at the estimated time of occurrence. The Nautical Almanac provides the base time for the latitude; apply the longitude correction based on the vessel's position relative to the zone meridian. The calculated zone time for this specific date is 0523.