At 0500 zone time on 21 August, your DR position is LAT 47°00'N, LONG 125°15'W. You are steering 000°T at a speed of 9.8 knots. What is the zone time of sunrise?

Correct Answer: Option B — 0525

Find the LMT of sunrise for the DR latitude in the Nautical Almanac. Convert to ZT using the longitude difference from the zone meridian (120°W). Adjust for the vessel's movement toward the north. The calculated zone time of sunrise is 0525.