On 12 October your vessel is on course 081°T, speed 20 knots. Your 1800 zone time DR position is LAT 26°11.0' S, LONG 77°18.0' E. You observed 3 celestial bodies. Determine the latitude and longitude of your 1835 running fix.

Correct Answer: Option B — LAT 26°12.0'S, LONG 77°31.0'E

Advancing simultaneous celestial observations across a 35-minute run at 20 knots on course 081°T requires shifting intercept intercepts along the DR track. The resulting line intersections produce the running fix coordinates of LAT 26°12.0'S, LONG 77°31.0'E in accordance with standard navigational reduction protocols.