Question 358Navigation General70% to pass
When approaching a lock and at a distance of not more than a mile, vessels desiring a single lockage shall sound which signal?
AI Explanation
The correct answer is B) One long blast followed by one short blast.
According to the U.S. Coast Guard Navigation Rules, when approaching a lock and at a distance of not more than a mile, vessels desiring a single lockage shall sound one long blast followed by one short blast as the signal. This indicates to the lock operator that the vessel is requesting a single lockage.
The other options are incorrect because they do not match the standard signal prescribed in the Navigation Rules for this situation. Two short blasts, one short blast followed by one long blast, and two long blasts are used for different purposes and would not be the appropriate signal when approaching a lock.
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#356 What are the colors of a mid-channel daymark? #357 What daymark shape is used in the lateral system? #359 You are in a channel inbound from sea. A daymark used to mark a channel junction, when the preferred channel is to port will have the shape indicated by what letter in illustration D045NG below? #360 In illustration D045NG below, a green-and-red banded daymark, with the uppermost band green, will have which of the following shapes? #361 In illustration D045NG below, what two shapes shown are used to indicate a preferred channel?