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

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Question 1 of 2066636ee928f7522a1c519980

You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown in illustration D047NG below. The range continues to open. What action should you take?

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Question 1 of 20

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🔍 Key Concepts

• How range markers appear visually when you are on the range line versus when you are off to one side • The meaning of a range that is opening or closing as you proceed inbound • How to decide whether to alter course toward the upper (rear) mark or away from it to regain the range line

💭 Think About

• Look carefully at the illustration: Is the rear (taller) range mark appearing to the left or to the right of the front (shorter) mark? What does that tell you about which side of the range line you are on? • If the range is continuing to open while you maintain 306°T, are you moving toward or farther away from the 309°T range line? • To bring the two marks back into line, would you need to steer your vessel’s heading closer to 309°T or farther away from 309°T?

✅ Before You Answer

• Identify clearly which way the rear mark is offset from the front mark in the picture and match that to the side of the range line you are on. • Confirm that your correction must temporarily put your heading on or slightly beyond 309°T to stop the range from opening and make it close. • Eliminate any option that tells you to steer further away from 309°T even though the range is already opening while you are left or right of the line.

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