You are outbound in a channel marked by a...

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Question 1 of 2066636ee928f7522a1c519dce

You are outbound in a channel marked by a range astern. The range line is 309°T. You are steering 127°T and have the range in sight as shown in illustration D047NG below. What action should you take?

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Question 1 of 20

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🔍 Key Concepts

• Range lines and reciprocals – A range of 309°T means the reciprocal (for the opposite direction) is 129°T. • Range astern vs. range ahead – The way you interpret which side of the line you are on reverses when the range is behind you. • Open ranges – If the front (lower) mark appears off to one side of the rear (higher) mark, your vessel is off the range line in that direction.

💭 Think About

• First, decide: for an outbound vessel, what course should you be on when exactly on a 309°T range that is astern? Compare that to the courses given in the answers. • Look carefully at the illustration: is the front (lower) mark seen to the right or to the left of the rear (higher) mark? For a range astern, does that mean your vessel lies to the right or left of the range line? • Once you know which side of the range line you are on, which answer choice tells you to turn in the correct direction to bring the marks into line and then steer the proper outbound course?

✅ Before You Answer

• Verify which answer choices end with steering 129°T, the proper reciprocal of 309°T for outbound traffic. • Confirm from the picture whether the front (lower) range mark is to the right or left of the rear (higher) range mark as you see them from the vessel. • Eliminate any option that has you turning away from the side you need to move toward in order to bring the two range marks into line.

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