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Bouys are floating aids to navigation and are used to indicate possible dangers and obstacles to navigation such as sandbanks, rocks and wrecks, and for marking the areas of safe waters and the edges of channels and  fairways at the entrance to ports.

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The different types of buys are made distinctive as possible and can be easily identified from a distance. The can have different shapes, different colours and topmarks  indicating the specific purpose or "meaning" of the buoy

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Here is a brief description of each buoy's main purpose:
• Lateral marks indicate the edges of a channel.
• Cardinal marks indicate the direction of safe waters at a dangerous spot.
• Safe water marks indicate deep waters and the open end of a channel.
• Isolated danger marks indicate a hazard to shipping.
• Special marks indicate an area used for special purposes.

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DISTINGUISHING OF DIFFERENT TYPES OF BUOY

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DISTINGUISHING OF DIFFERENT TYPES OF BUOY

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All marks within the IALA System are distinguished by: shape, colour, topmark  and light.

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Lateral marks indicate the part-hand side and the starboard-hand side of a channel or harbour.
In the System Region A, port-hand side marks are red, while starboard-hand marks are green.

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The countries that use the red colour for the left-hand sign or portside mark are included in Region A (IALA System A).
The countries that use the green colour for the portside mark are included in Region B (IALA System B).