You sight a buoy fitted with a double-sphere...

Question 1 / 2707066636ee928f7522a1c51a0c7

Question 1 of 2707066636ee928f7522a1c51a0c7

You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?

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Question 1 of 27070

You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?

🔍 Key Concepts

• IALA buoyage system and the meaning of a double-sphere topmark • Characteristics of an isolated danger mark (shape, color, topmark, and light) • Difference between lateral marks (port/starboard) and special/safe water/isolated danger marks at night

💭 Think About

• First, identify what kind of buoy uses a double black sphere as a topmark, then recall its standard light color and rhythm • Compare which of the answer choices match the typical light characteristics (color and flash grouping) for that specific type of mark • Eliminate choices that describe lights normally associated with lateral marks (port/starboard channel marks)

✅ Before You Answer

• Confirm which buoy type is marked by two black balls (double-sphere) on top • Verify the standard light color used for that buoy type in the IALA buoyage system • Verify the flash pattern (single, group, number of flashes) that is prescribed for that buoy type at night

Question 1 of 27070

You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?

A quick-flashing red light

A quick-flashing green light

A flashing red light showing a group of three flashes

A flashing white light showing a group of two flashes

Question 1 / 2707066636ee928f7522a1c51a0c7

Question 1 of 2707066636ee928f7522a1c51a0c7

You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?

Back

Question 1 of 27070

You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?