In the IALA Buoyage System, preferred-channel...

Question 1 / 2707066636ee928f7522a1c519909

Question 1 of 2707066636ee928f7522a1c519909

In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, when fitted with lights, will show a __________.

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Question 1 of 27070

In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, when fitted with lights, will show a __________.

🔍 Key Concepts

• IALA Buoyage System A and B – how preferred channel marks are shown on charts and in light lists • Difference between lateral marks (simple port/starboard) and preferred-channel marks (bifurcation marks) • How light characteristics indicate “main channel” vs “secondary channel” at a junction

💭 Think About

• Think about how a mariner can tell, at night, which way to steer at a junction when there are two possible channels. What special light pattern helps show the preferred channel? • Look at the choices: which of these is clearly different from the basic flashing patterns used on standard lateral buoys? • Ask yourself: which light characteristic is specifically designed to show a bifurcation (a split in the channel) rather than just a simple port or starboard side of the channel?

✅ Before You Answer

• Verify in an IALA buoyage reference which light characteristic is assigned to preferred channel marks (also called bifurcation marks). • Confirm that ordinary port or starboard lateral buoys usually have simple flashing or quick flashing lights, not this special pattern. • Make sure the option you choose specifically indicates a combined or ‘composite’ group pattern that stands out from basic flashing rhythms.

Question 1 of 27070

In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, when fitted with lights, will show a __________.

long flashing light

quick flashing light

group flashing

composite group flashing (2 + 1) light

Question 1 / 2707066636ee928f7522a1c519909

Question 1 of 2707066636ee928f7522a1c519909

In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, when fitted with lights, will show a __________.

Back

Question 1 of 27070

In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, when fitted with lights, will show a __________.