On 8 August your 0400 ZT DR position is LAT 23°16.0'S, LONG 105°33.0'W. You are on course 295°T at a speed of 25 knots. What will be the zone time of sunrise at your vessel?

Correct Answer: Option C — 0636

Obtain the LMT of sunrise for the DR latitude from the Nautical Almanac. Convert to ZT using the longitude difference from the zone meridian (105°W). Account for the vessel's movement during the approach to sunrise. The calculated zone time is 0636.