Question 578Navigation General

The correct answer is C) 315.0°. The compass course of a vessel heading NW (northwest) is 315.0 degrees. This is because the four cardinal directions (N, E, S, W) are at 0°, 90°, 180°, and 270° respectively, and the intermediate directions (NW, NE, SE, SW) are exactly halfway between them, at 45° intervals. Therefore, the compass course for a vessel heading NW is 315.0°. The other options are incorrect because A) 274.5° is southwest, B) 292.5° is west-northwest, and D) 337.5° is north-northwest, which are not the correct compass course for a vessel heading northwest.