On 13 August your 0345 ZT DR position is LAT 21°35.0' N, LONG 135°26.0'W. You are on course 052°T at a speed of 14 knots. What will be the zone time of sunrise at your vessel?

Correct Answer: Option C — 0536

Extracting local mean time of sunrise from the Nautical Almanac for the given date and latitude, then applying the longitude correction (converted to time) and the zone description, determines the exact zone time of sunrise as 0536.