Which topmark shown in illustration D023NG...

Question 1 / 2707066636ee928f7522a1c51a320

Question 1 of 2707066636ee928f7522a1c51a320

Which topmark shown in illustration D023NG below identifies an isolated danger?

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Question 1 of 27070

Q

Which topmark shown in illustration D023NG below identifies an isolated danger?

If the question has a related picture, it will appear here.

🔍 Key Concepts

• IALA buoyage system and the meaning of different topmarks • Difference between isolated danger marks and safe water marks • How pairs of shapes (balls or cones) are arranged to distinguish buoy types

💭 Think About

• Look at which option shows two identical shapes stacked vertically and compare that to what you remember for an isolated danger mark. • Ask yourself: which of these topmarks would logically mark a single hazard that you can pass all around, rather than indicating a preferred channel or a cardinal direction? • Think about where you have seen isolated danger symbols on charts — which symbol here most closely matches that chart symbol’s topmark?

✅ Before You Answer

• Verify which topmark in the IALA system for isolated danger uses two black shapes and note their form (balls vs cones). • Make sure you are not confusing the isolated danger topmark with the safe water mark, which uses a different number of shapes. • Confirm that the chosen topmark is used to show a danger with navigable water all around, not to indicate a quadrant (N, E, S, W) as cardinal marks do.

Question 1 of 27070

Q

Which topmark shown in illustration D023NG below identifies an isolated danger?

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Question 1 / 2707066636ee928f7522a1c51a320

Question 1 of 2707066636ee928f7522a1c51a320

Which topmark shown in illustration D023NG below identifies an isolated danger?

Back

Question 1 of 27070

Q

Which topmark shown in illustration D023NG below identifies an isolated danger?

If the question has a related picture, it will appear here.

🔍 Key Concepts

• IALA buoyage system and the meaning of different topmarks • Difference between isolated danger marks and safe water marks • How pairs of shapes (balls or cones) are arranged to distinguish buoy types

💭 Think About

• Look at which option shows two identical shapes stacked vertically and compare that to what you remember for an isolated danger mark. • Ask yourself: which of these topmarks would logically mark a single hazard that you can pass all around, rather than indicating a preferred channel or a cardinal direction? • Think about where you have seen isolated danger symbols on charts — which symbol here most closely matches that chart symbol’s topmark?

✅ Before You Answer

• Verify which topmark in the IALA system for isolated danger uses two black shapes and note their form (balls vs cones). • Make sure you are not confusing the isolated danger topmark with the safe water mark, which uses a different number of shapes. • Confirm that the chosen topmark is used to show a danger with navigable water all around, not to indicate a quadrant (N, E, S, W) as cardinal marks do.