Glossary Archive

Ropes or cords used to reduce the sail area by securing a portion of the sail to the boom or mast, thereby making the vessel more manageable in strong winds. Reefing lines are a critical component of a sailboat's rigging system, designed to facilitate the process of reefing, which involves reducing the size of a...

When the sender is not actively sending messages, both flags are held by their side. The same shape is also used for Space (Flag Semaphore) & Ready (Flag Semaphore).

A ship that, due to the nature of its work, is unable to keep out of the way of other vessels as required by the International Regulations for Preventing Collisions at Sea (COLREGs). A vessel classified as "Restricted in Ability to Manoeuvre" (RAM) is one that cannot deviate from its course or alter its movements...

Conditions in which a vessel's ability to see is significantly reduced due to environmental factors such as fog, heavy rain, snow, or mist. Restricted visibility is a critical term in maritime navigation, as it describes situations where a vessel's crew cannot see as far as they normally would, making it difficult to navigate safely. This...

A line on the surface of the earth that cuts all meridians at the same angle.  On a standard Mercator chart the rhumb line appears as a straight line

A loop of rope that crosses over itself on a winch drum or cleat, often causing friction or jamming. A riding turn is a term commonly used in the context of rope handling aboard vessels, particularly when dealing with winches, cleats, or other devices used to secure or manage lines. It occurs when a rope...

The system of ropes, cables, chains, and other apparatus used to support and control the sails and masts of a sailing vessel. Rigging is essential to any sailing vessel, enabling the crew to manipulate the sails to harness wind power for propulsion. There are two primary categories of rigging: standing rigging and running rigging. Standing...

Verb - The process of setting up and adjusting the sails, lines, and other necessary equipment on a boat or ship to ensure it is ready for sailing. Rigging refers to preparing a vessel for navigation by arranging and securing its various components, such as sails, ropes (also known as lines), masts, and spars. This...

A vessel that has both a solid part and inflatable part to its structure

An internationally renowned professional institution representing naval architects and marine engineers worldwide. It was founded in 1860 and is based in London, United Kingdom. RINA provides professional accreditation, training, and technical support to individuals and organisations involved in the design, construction, and operation of ships and marine structures. The institution plays a key role in...