Question 404Navigation General

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.