You sight a spar buoy with the topmark shown...

You sight a spar buoy with the topmark shown...

Question 1 of 2707066636ee928f7522a1c51a0cd

You sight a spar buoy with the topmark shown in illustration D027NG below. You must take which of the following actions?

Question 1 of 27070

Q

You sight a spar buoy with the topmark shown in illustration D027NG below. You must take which of the following actions?

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🔍 Key Concepts

• IALA buoyage system – especially isolated danger marks • Meaning of a black spar buoy with two black spheres as a topmark • Difference between cardinal marks (N/S/E/W) and danger/safe-water marks

💭 Think About

• Look at the exact shape and arrangement of the two black topmarks – does this match any of the four cardinal marks? • Ask yourself what an isolated danger mark tells you about the water immediately around the buoy versus a little farther away. • Think about whether this topmark is directing you to a specific side, or simply warning you about something close to the buoy.

✅ Before You Answer

• Confirm that two black balls, one above the other, is NOT a north/east/south/west cardinal configuration of cones. • Recall that an isolated danger mark indicates danger at the buoy’s position but navigable water all around at a safe distance. • Decide whether the mark requires you to pass on a specific side (N/S/E/W) or just to give it a good berth and choose your own side.