These special-purpose buoys have orange symbols on white pillars, cans, or spars. They are used to:
- Give directions and information.
- Warn of hazards and obstructions.
- Mark controlled areas.
- Mark keep-out (closed) areas.
Information Buoys: Squares provide information such as places to find food, supplies, and repairs. They also give directions, distances, and other non-regulatory information.
Hazard Buoys: Diamonds warn of hazards such as rocks, shoals, or turbulent waters. Always proceed with caution and keep a safe distance. Never assume that every hazard will be marked by a buoy.
Control Buoys: Circles indicate a restricted boating area such as no wake, idle speed, speed limit, or wash restrictions. You must obey the restriction inside the circle.
Keep-Out Buoys: Crossed diamonds indicate areas where pleasure craft are prohibited such as dams and spillways.