Glossary Archive

A type of multihulled vessel featuring two parallel hulls of equal size, connected by a deck or framework, offering stability, speed, and efficiency in the water. A catamaran is a distinctive type of watercraft that stands out due to its twin-hull design. Unlike traditional monohull boats, which rely on a single hull for buoyancy and stability, a...

A vessel whose ability to deviate from its current course is significantly restricted due to the depth of water relative to its draught. A vessel "Constrained by Draught" refers to a specific situation under the International Regulations for Preventing Collisions at Sea (COLREGs), where a ship's manoeuvrability is severely limited because of the relationship between...

A navigational situation where two vessels maintain the same relative bearing to each other while the distance between them diminishes, often indicating a potential risk of collision. Constant bearing, decreasing range (CBDR) is a concept in maritime navigation, used to assess collision risks between vessels at sea. When two vessels are on a CBDR trajectory,...

The International Maritime Signal Flag Charlie. Meaning Affirmative.If appended with a Numeral Pennant, a Magnetic Bearing.

The CEVNI Test Online is a certification required for those navigating inland waterways in Europe. The test covers the European Code for Inland Waterways (CEVNI), including navigation rules, signage, and operational requirements. This online exam ensures participants understand the specific regulations governing inland navigation, making it a vital qualification for those seeking the International Certificate...

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 issue in the marine environment, where ropes, lines, sails, and other materials are constantly subjected to movement and friction. This friction occurs when these materials rub against hard surfaces such...

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.  Chainplates are critical structural components of a sailing vessel, serving as the secure attachment points for the standing rigging that supports the mast. They are typically made of stainless steel...

A supplier or dealer specialising in providing equipment, provisions, and supplies for ships and their crews. A chandler refers to a professional or business entity that caters specifically to the needs of ships and their crews. Historically, chandlers were essential figures in the maritime world, ensuring that vessels were well-stocked with everything required for their...

A navigable waterway, often a natural or dredged passage, that allows vessels to travel between larger bodies of water or through shallow areas. A channel in maritime contexts refers to a specific route or passage in a body of water that is deep enough for vessels to navigate safely. Channels can be naturally occurring, such...

Pronounced: CHAR-lee The term for the letter C in the NATO Phonetic Alphabet.