On 28 June your 1820 ZT DR position is LAT 16°00.0'N, LONG 31°00.0'W. You are on course 310°T at a speed of 18 knots. What will be the zone time of sunset at your vessel?

Correct Answer: Option A — 1840

Calculate the DR position at the approximate time of sunset. Use the Nautical Almanac to find the tabular sunset time for the latitude and date. Apply the longitude correction to adjust the tabular time to the vessel's zone time, resulting in 1840.