Question 6 AB01 - Able Seafarer

The Correct Answer is B **Explanation for Option B (225.0°):** Compass courses (or true courses) are measured clockwise from True North (000° or 360°). * North (N) is 000° (or 360°). * East (E) is 090°. * South (S) is 180°. * West (W) is 270°. Southwest (SW) is the bisector of the angle between South (180°) and West (270°). The calculation is: $180^\circ + (270^\circ - 180^\circ) / 2 = 180^\circ + 90^\circ / 2 = 180^\circ + 45^\circ = 225.0^\circ$. Therefore, the compass course of a vessel heading SW is 225.0°. **Explanation for Incorrect Options:** * **A) 202.5°:** This course lies between South (180°) and Southwest (225°). It corresponds to the secondary intercardinal direction South-Southwest (SSW). * **C) 247.5°:** This course lies between Southwest (225°) and West (270°). It corresponds to the secondary intercardinal direction West-Southwest (WSW). * **D) 270.0°:** This course corresponds directly to West (W).