Glossary Archive

A line or tackle rigged to the boom or spar to prevent unwanted movement, particularly to stop a boom from swinging dangerously during an accidental gybe. A preventer is an essential safety feature in sailing, designed to stabilise the boom and reduce the risk of injury or damage during certain manoeuvres or in challenging conditions....

The zero-degree longitude line that is the starting point for measuring longitude and dividing the Earth into the Eastern and Western Hemispheres. The Prime Meridian is an essential global navigation and cartography reference line, particularly for marine navigation. It runs from the North Pole to the South Pole, passing through the Royal Observatory in Greenwich,...

The RYA Professional Practices and Responsibilities (PPR) course is a mandatory online qualification for individuals seeking a Commercial Endorsement on their RYA certificates. The course covers key topics such as legal obligations, safety management, and customer service in the marine industry. Participants learn how to operate professionally and responsibly, ensuring compliance with international regulations. This...

A propeller is a fan-like device that propels a boat or ship through the water by converting rotational motion into thrust. Propellers typically have multiple blades shaped to efficiently move water and create forward motion for the vessel. They are commonly found on the stern (back) of boats and ships and can be powered by...

A propeller shaft is a long, cylindrical metal shaft that connects the boat's transmission or gearbox to the propeller. It transmits power from the engine to the propeller, allowing it to spin and propel the boat through the water. The propeller shaft is typically made of stainless steel or other durable materials to withstand the...

The lateral movement of a boat's stern caused by the rotational forces of the propeller, typically noticeable when operating at low speeds or in reverse. Propeller walk, also known as "prop walk," is a phenomenon that occurs due to the asymmetrical thrust generated by a propeller as it rotates in the water. This effect is...

The turbulent flow of water generated by a vessel's propeller as it moves through the water, often creating strong currents and turbulence behind the boat.  Propeller wash is the disturbed water flow caused by the rotation of a vessel's propeller. As the propeller spins, it accelerates water backwards, generating thrust that propels the boat forward....

A raised structure at the bow of a vessel, often made of metal, designed to provide safety for crew members working at the front of the boat. The pulpit, also known as the bow pulpit, is a safety feature found on many types of vessels, particularly sailboats and some motorboats. It is typically constructed from...

A sturdy, protective railing or guardrail located at the stern of a boat, often forming part of the vessel's safety framework. The pushpit, sometimes referred to as the stern pulpit, is an integral safety feature on many sailing yachts and motorboats. Positioned at the aft (rear) end of the vessel, it serves as a protective...

A device or material designed to produce light, heat, smoke, or sound through a chemical reaction, commonly used in marine signalling for emergency or distress situations. Pyrotechnics in the maritime context are essential safety tools used primarily for signalling distress or attracting attention during emergencies at sea. These devices typically include hand-held flares, parachute flares...