Glossary

A unique identifier assigned to a vessel or maritime station for communication purposes, typically used in radio transmissions.

A call sign is...

A mechanical device with spring-loaded, opposing cams that grip a rope or line to hold it securely while allowing for quick adjustments. 

A...

Cancel (or Disregard) informs the receiver to disregard the previous message or cancel the signalling. There is no specific attachment to...

An overturning of a boat so that the hull or keel becomes exposed.

This can happen when a small craft is overpowered by wind, hit by a wave,...

Cardinal Bearings are the main points on a compass, expressed by their name. There are four main cardinal points, North, South, East, and West...

Buoy or pillar placed North, East, South or West side of an obstruction to warn vessels away.

Cardinal marks indicate that the deepest water...

Releasing a rope or line so a vessel can move away.

This is commonly used when leaving a berth, buoy, tow or alongside position. Lines should...

A type of multihulled vessel featuring two parallel hulls of equal size, connected by a deck or framework, offering stability, speed, and...

A vessel whose ability to deviate from its current course is significantly restricted due to the depth of water relative to its draught.

A...

A navigational situation where two vessels maintain the same relative bearing to each other while the distance between them diminishes, often...

The International Maritime Signal Flag Charlie.

Meaning

Affirmative.
If appended with a Numeral Pennant, a Magnetic Bearing.

The wear or damage caused to a rope, sail, or other material due to continuous rubbing or friction against a surface.

Chafing is a common...

A strong metal plate, usually stainless steel, bolted to a boat’s hull or deck to which the shrouds or stays of the rigging are attached. 

A supplier or dealer specialising in providing equipment, provisions, and supplies for ships and their crews.

A chandler refers to a...

A navigable waterway, often a natural or dredged passage, that allows vessels to travel between larger bodies of water or through shallow...

Pronounced: CHAR-lee

The term for the letter C in the NATO Phonetic Alphabet.

A detailed map used in marine navigation, showing water depths, hazards, and other critical information for safe passage.

A marine chart...