On 18 May your 1030 ZT DR position is LAT 20°41'N, LONG 63°32'W. You are on course 106°T, speed 24 knots. Determine your 1200 position using the following observations of the Sun.

Correct Answer: Option D — LAT 20°32.6'N, LONG 62°57.5'W

Advancing a morning celestial sight line to the 1200 meridian passage time requires applying vessel course and speed vectors to the DR position. Using standard intercept methods from Bowditch, the computed latitude and longitude correct the DR, resulting in LAT 20°32.6'N, LONG 62°57.5'W.