When a dual-purpose marking is used, how...

Question 1 / 2707066636ee928f7522a1c51962b

Question 1 of 2707066636ee928f7522a1c51962b

When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?

Question 1 of 27070

When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?

🔍 Key Concepts

• Intracoastal Waterway (ICW) aids and how they differ from standard lateral marks • Meaning of a dual-purpose marking in the U.S. Aids to Navigation System • How yellow markings are used on buoys and daybeacons along the ICW

💭 Think About

• Think about what extra feature is added to an aid when it needs to serve BOTH the regular lateral system and the ICW at the same time. • Ask yourself: when you see a standard red or green buoy that ALSO serves the ICW, what specific part of its appearance tells you the ICW direction? • Consider whether ICW guidance depends more on overall color and shape, or on a smaller, specially colored marking added for ICW use.

✅ Before You Answer

• Review how yellow symbols/marks are used on buoys in the ICW (e.g., triangles, squares, bands, or small marks). • Confirm whether ICW direction is determined by the overall lateral color/shape or by an additional colored feature on the aid. • Make sure you know the difference between using an aid’s main body/shape versus using a small added marking to interpret ICW information.

Question 1 of 27070

When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?

By the shape of the aid

By the shape of the yellow mark

By the color of the top band

By the color of the aid

Question 1 / 2707066636ee928f7522a1c51962b

Question 1 of 2707066636ee928f7522a1c51962b

When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?

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Question 1 of 27070

When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?