During daylight hours black double-cone...

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Question 1 of 2066636ee928f7522a1c519506

During daylight hours black double-cone topmarks are the most important feature of cardinal marks. Which of the four topmarks shown in illustration D030NG below indicates the best navigable water lies to the west of the buoy?

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Question 1 of 20

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🔍 Key Concepts

• IALA cardinal marks and what they indicate about the location of safe water • The meaning of the double-cone topmark orientations (both up, both down, points apart, points together) • Association between each orientation and the compass direction (N, E, S, W) of safe water relative to the danger

💭 Think About

• First, recall or sketch the standard diagram that links cone directions to the four cardinals. Which pattern shows cones pointing toward each other, and what compass direction does that represent? • Match each labeled option (A–D) to its corresponding cardinal direction based solely on the cone orientation. Then ask: for which of those cardinals is the safe water on the west side of the buoy? • Eliminate any options whose cone pattern is used for north, south, or east cardinals, leaving the one that matches west.

✅ Before You Answer

• Be sure you remember that both cones point up = one specific cardinal and both cones point down = another; do not mix those two. • Confirm which pattern has the cones’ points together vs. bases together – this difference tells you west vs. east. • Before choosing, verify that the remaining option’s cone pattern matches the official IALA cardinal buoy diagram from your study materials.

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