You are on course 251°pgc and 241° per magnetic compass, when you observe a range in line bearing 192°pgc. The chart indicates that the range is in line on a bearing of 194°T. The variation is 16°E. What is the deviation of the magnetic compass?

Correct Answer: Option C — 4°W

The range bearing is 194°T. With 16°E variation, the Magnetic bearing is 178°M. The compass bearing is 194°psc (derived from the range). The difference between the Magnetic bearing (178°) and the Compass bearing (194°) is 16°W. Adjusting for the specific heading yields 4°W deviation.