🔍 Key Concepts

• IALA Maritime Buoyage System – especially special marks vs lateral marks vs isolated danger marks • The purpose of an isolated danger mark (what it is marking and where it is located) • How color patterns help distinguish danger marks from safe water marks and channel marks

💭 Think About

• Ask yourself: What is an isolated danger (for example, a rock or wreck) and how should its buoy look so it clearly warns mariners? • Think about which color combinations are used for channel sides and safe water – then eliminate any options that match those instead of a danger mark. • Consider which color pattern would stand out clearly against the sea and sky while also being distinct from red/green lateral buoys.

✅ Before You Answer

• Verify which option matches the standard IALA isolated danger mark color scheme. • Eliminate any color schemes you recognize as lateral channel marks (port/starboard) or safe water marks. • Confirm that the remaining choice is associated with a buoy that often has two black spherical topmarks and a white light showing a group of 2 flashes.