On 16 August your 1600 ZT DR position is LAT 26°17.0'N, LONG 165°17.0'E. You are on course 301°T at a speed of 15 knots. What will be the zone time of sunset at your vessel?

Correct Answer: Option C — 1838

Calculate sunset by interpolating the Nautical Almanac for the DR latitude. Adjust the tabular time for the vessel's longitude and the change in position due to the 301°T course at 15 knots. The vessel is moving toward the sunset line, resulting in an earlier zone time of 1838.