You are enroute to assist vessel A. Vessel A is underway at 5 knots on course 063°T, and bears 136°T at 78 miles from you. What is the course to steer and running time at 13 knots to intercept vessel A?

Correct Answer: Option B — 115°, 7h 20m

Relative motion analysis using a maneuvering board (MOBOARD) determines the intercept course. Plotting the target's vector (5 knots at 063°) and your speed (13 knots) yields a relative motion line. Solving the vector triangle confirms a course to steer of 115°T and a distance-to-run requiring 7 hours and 20 minutes.