If the final bearing is 345 and the Marshal radial is on the 180, what heading will the aircraft fly to correct to the final bearing at 20NM?

Answer: B — 030

To determine the correct heading the aircraft should fly to correct to the final bearing, we first need to analyze the information provided. The final bearing is 345 degrees, which is close to the northern direction, just 15 degrees west of true north. The marshal radial at 180 degrees indicates the direction is south. In this scenario, the aircraft is located south of the final approach path, so it needs to turn in a way that brings it back to the final bearing of 345 degrees. To correct from a position at 180 degrees (south) to a destination of 345 degrees (northwest), the aircraft must navigate left (making a counterclockwise turn). The aircraft should head in a direction that allows it to intercept the final approach path. The correct heading to fly is found by determining which angle will lead the aircraft northwest while still accounting for its current path (south). The 30 degrees heading is a suitable angle because it results in a heading that satisfactorily aligns the aircraft on a direct route towards the final bearing of 345 degrees after accounting for the corrective course adjustment. Thus, the aircraft should fly at a heading of 30 degrees to ensure it intercepts the final approach path effectively, making this the correct option.