Question 1835Navigation General

70% to pass

You are outbound in a channel marked by a range astern. The range line is 133°T. You are steering 315°T and have the range in sight as shown in illustration D048NG below. What action should you take?

Diagram for USCG Navigation General: You are outbound in a channel marked by a range astern. The range line is...
A Come right until the range comes in line then alter course to 313°T.
B Come left to 313°T.
C Come right until the range comes in line then alter course to 317°T.
D Come left to close the range then when on the range steer 313°T.
AI Explanation

The correct answer is D) Come left to close the range then when on the range steer 313°T. This is the correct answer because when navigating a channel marked by a range astern, you want to steer a course that keeps the range in line. Since you are steering 315°T and the range line is 133°T, coming left will bring you closer to the range line, allowing you to steer 313°T once you are on the range. The other options are incorrect because A) and C) involve altering course to the wrong heading, while B) does not actually put you on the range line.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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