On 25 March your 0500 ZT DR position is LAT 28°14.0' S, LONG 93°17.0' E. You are on course 291°T at a speed of 16.0 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0550 running fix.

Correct Answer: Option A — LAT 28°15.9'S, LONG 92°56.9'E

Updating celestial lines of position for course and speed run over the elapsed interval produces the running fix. The vector calculation applies exact speed and time to advance the initial intercept.