🔍 Key Concepts

• Special purpose marks in the IALA buoyage system • Color and light characteristics used for special marks • Difference between "may" and "must" in buoy light requirements

💭 Think About

• What color is a special purpose (special) mark, and what is its topmark shape? • What is the standard light color and rhythm used for special marks when they are lighted? • Does every special mark have to be lighted, or can some be unlighted depending on location and need?

✅ Before You Answer

• Verify the standard light color associated with special purpose marks • Check whether regulations say special marks must be lighted or only may be lighted • Confirm if red or white lights are normally used for special purpose buoys in the IALA system