Question 404Navigation General

70% to pass

If a towboat requires a double lockage it shall give which sound signal at a distance of not more than one mile from the lock?

A One long blast followed by two short blasts
B One short blast followed by two long blasts
C One long blast followed by one short blast
D Two long blasts followed by one short blast
AI Explanation

The correct answer is A) One long blast followed by two short blasts. This is the correct signal required by the United States Coast Guard regulations for vessels approaching a lock that requires a double lockage. The long blast followed by two short blasts is the standard signal to notify the lock that the vessel requires a double lockage, which means the vessel needs to be locked through the lock twice due to its size or configuration. The other options are incorrect because they do not match the specific signal prescribed by the Coast Guard regulations for this situation.

Related Questions
Q@q.QuestionNumber:According to Buys Ballot's law, when an observer in the Northern Hemisphere exp... Q@q.QuestionNumber:By convention, the south seeking ends of a compass' magnets are colored ________... Q@q.QuestionNumber:At evening stars, the first stars that should be observed are those with an azim... Q@q.QuestionNumber:The dividing meridian between zone descriptions -7 and -8 is _______________. Q@q.QuestionNumber:What is true about a front?

Ready to test your knowledge?

Take a Navigation General Practice Exam
Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App