Marina Exam Reviewer: Your vessel is underway in fog and you hear two prolonged blast on your starboard quarter. What appropriate action should you do?

Marina Exam Reviewer 

Your vessel is underway in fog and you hear two prolonged blast on your starboard quarter. What appropriate action should you do? 

A. Alter course to port 
B. Hold your course and speed 
C. Stop your engine 
D. Alter course to starboard 


Answer:  B. Hold your course and speed