On 27 March your 0330 zone time DR position is LAT 23°32'N, LONG 154°47'E. Your vessel is on a course of 105°T at a speed of 20 knots. What will be the zone time of sunrise at your vessel?

Correct Answer: Option A — 0534

Calculate the time of sunrise at the DR position using the Nautical Almanac. Adjust for the vessel's longitude by converting degrees to time. Since the vessel is moving east at 20 knots, apply the time correction for the change in position to arrive at the correct zone time of 0534.