You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 346°T at 68 miles from you. What is the course to steer at 13 knots to intercept vessel A?

Correct Answer: Option C — 327°

Solving this navigational intercept vector via maneuvering board principles establishes the relative motion triangle. Using own ship speed of 13 knots against vessel A's course of 233°T at 4.5 knots yields a calculated intercept true course of 327°.