275. On 25 December your 0330 ZT DR position is LAT 25°15.0'N, LONG 32°16.0'W. You are on course 145°T at a speed of 20 knots. What will be the zone time of sunrise at your vessel?

Sunrise zone time is determined by converting the Nautical Almanac's local mean time of sunrise at the vessel's DR position to GMT, then to zone time, accounting for the vessel's course and speed. This process yields a sunrise zone time of approximately 0647.