Definition

Noun: A can buoy is a type of navigational buoy, characterized by its flat top and cylindrical or can-shaped body, which is used to mark the left side of a channel or harbor entrance when entering from the sea. It is distinct from a "nun buoy," which has a conical top and marks the right side.

Usage

The term "can buoy" is used specifically in maritime navigation and charting. It refers to the physical object itself and its standardized shape and color (typically green or black in the IALA system).

Examples

• The captain steered to port, keeping the can buoy on the left side of the vessel.
• The nautical chart indicated a can buoy at the entrance to the cove.
• Mariners must be able to distinguish between a can buoy and a nun buoy.

Advanced Usage

• In the IALA-B system (used in the Americas and some other regions), can buoys mark the port (left) side of a channel when returning from sea. They are often, but not always, green.
• The term is precise; using "buoy" alone is generic, while "can buoy" specifies the shape and, by implication, its navigational meaning.

Variants and Related Words

• Buoy (n): The general term for a floating object anchored in water to mark a location, warn of danger, or indicate a navigational channel.
• Nun buoy (n): A buoy with a conical top, used to mark the starboard (right) side of a channel when returning from sea.
• Lateral mark (n): A system of buoys (including can and nun buoys) that indicate the sides of a navigable channel.

Synonyms

• Port-hand buoy: A more functional synonym describing its purpose (marking the port/left side) rather than its shape.
• Channel marker: A broader term that could include can buoys.

Related Phrases/Idioms

• "Red, right, returning": A common mnemonic in the IALA-B system to remember that red, conical-top (nun) buoys should be kept on the starboard (right) side when returning to harbor. Conversely, can buoys (green/black) are kept on the port (left) side.

Noun

1. a buoy with a round bottom and conical top