You are proceeding up a channel at night. It is marked by a range which bears 185°T. You steady up on a compass course of 180° with the range in line dead ahead. This indicates that you(r) __________.

Correct Answer: Option D — compass has some easterly error

In USCG General Navigation principles (Bowditch, Light Lists, and Coast Pilots), regarding 'You are proceeding up a channel at night. It is marked by a range which bears 185°T. You steady up on a compass course of 180° with the range in line dead ahead. This indicates that you(r)', the verified fact is: 'compass has some easterly error'.