Yacht Industry Glossary — 60 Essential Terms

Vessels & Yachts12 terms

Superyacht: A privately-owned luxury yacht of 24 metres (79 feet) length overall or greater. Generally crewed and built to commercial-class standards even when used privately.
Megayacht: An informal industry term for a superyacht over 50 metres (164 feet) in length overall.
Gigayacht: An informal term for a superyacht over 100 metres (328 feet) in length overall. Roughly 100 vessels worldwide qualify.
LOAalso: Length Overall: Length Overall — the maximum length of a vessel from the foremost permanent fixture to the aftermost permanent fixture. The standard measurement used to classify yacht size.
Beam: The width of a vessel at its widest point. Determines berth requirements and Panama Canal passage eligibility.
Draftalso: Draught: The vertical distance between the waterline and the lowest point of the hull. Determines what depths a yacht can navigate and what marinas it can enter.
Displacement: The weight of water a vessel displaces when floating. Synonymous with the yacht's actual weight; expressed in tonnes.
Gross Tonnagealso: GT: A measure of a vessel's overall internal volume, not weight. Used to determine regulatory category, manning requirements, and port fees.
Expedition Yacht: A purpose-built or converted yacht designed for long-range voyaging in remote regions including polar waters. Features extended fuel range, ice-strengthened hulls, and self-sufficiency systems.
Sportfish: A yacht built for offshore sportfishing — typically 25–35 metres, with a flying bridge, fighting cockpit, and powerful engines for chasing pelagic species.
Tender: A smaller boat carried by or assigned to a yacht for transporting passengers, crew, or supplies between yacht and shore.
Refit: Major works performed on a yacht beyond routine maintenance — typically including hull repainting, engine overhauls, interior renewal, and systems upgrades. Often performed at dedicated refit yards.

Crew Roles & Ranks10 terms

Captain: The most senior officer onboard, holding ultimate responsibility for vessel safety, crew management, navigation, and compliance. Holds a Master Mariner certificate appropriate to the yacht's tonnage and trading area.
First Officeralso: Chief Officer, First Mate: Second in command. Oversees deck operations, navigation watches, and crew supervision when the captain is off-duty.
Chief Engineer: The senior engineering officer. Responsible for all mechanical, electrical, and propulsion systems onboard. Holds a Y-class or commercial engineering certificate.
ETOalso: Electro-Technical Officer: An engineer specialising in the yacht's electrical, electronic, and AV systems. Increasingly common on large yachts due to integration complexity.
Bosun: The most senior deckhand, responsible for deck maintenance, tender operations, and supervising junior deck crew.
Deckhand: A junior deck crew member responsible for cleaning, polishing, line handling, tender driving, and watersports operations.
Chief Stewalso: Chief Stewardess, Purser: The senior interior crew member managing service standards, guest experience, provisioning, and interior staff.
Stewardess: Interior crew responsible for guest service, cabin housekeeping, table service, laundry, and floral arrangements.
Yacht Chef: The vessel's culinary lead, responsible for menu planning, provisioning, dietary requirements, and meal preparation for owner, guests, and crew. Often holds Michelin or fine-dining experience.
Rotation: A crew working pattern alternating onboard and off — typically 2:2 (two months on, two off) on private yachts or 8:8 weeks on commercially-operated charter yachts.

Operations & Equipment8 terms

Dynamic Positioningalso: DP: An automated system using GPS, sensors, and thrusters to hold a yacht's exact position and heading without anchoring. Required for diving operations and sensitive seabed environments.
Stabilizers: Mechanical fins or gyroscopic systems that reduce a yacht's roll motion at sea (underway) and at anchor (zero-speed stabilizers). Critical for guest comfort.
Bow Thruster: A small propeller mounted laterally near the bow, used for low-speed manoeuvring in tight marinas without rudder steering.
Gyro Compass: A non-magnetic compass that finds true north via gyroscope, unaffected by magnetic interference. Standard on all commercial yachts.
AISalso: Automatic Identification System: A VHF-broadcast tracking system identifying vessels, course, and speed. Mandatory on yachts above 300 GT and used for collision avoidance.
ECDISalso: Electronic Chart Display: Electronic Chart Display and Information System. The digital, regulatory-approved replacement for paper navigation charts on yachts above 500 GT.
Tender Garage: An enclosed compartment within the yacht's hull for storing tenders, jet skis, and watersports equipment, accessed via a hydraulic side or transom door.
Beach Club: A guest amenity space at the waterline, typically at the transom, including platforms, swim ladders, and water-toys storage. Can include a fold-down balcony or sauna.

Regulation & Compliance11 terms

MCAalso: Maritime and Coastguard Agency: The UK government agency regulating commercial vessels including charter yachts. Sets crew certification standards widely adopted across the yacht industry.
USCGalso: United States Coast Guard: The US federal maritime authority enforcing US-flagged yacht regulation, navigation rules, and pollution standards in US waters.
MLC 2006also: Maritime Labour Convention: The International Labour Organization's convention establishing minimum working conditions, contracts, hours, accommodation, and welfare for seafarers. Mandatory on all commercial yachts.
SOLASalso: Safety of Life at Sea: The IMO convention setting minimum safety standards for vessel construction, equipment, and operation. Applies to most commercial yachts above 500 GT.
ISM Codealso: International Safety Management Code: The IMO framework requiring shipping companies and yacht management firms to implement a documented Safety Management System (SMS) onboard.
MARPOL: The International Convention for the Prevention of Pollution from Ships. Sets discharge limits for oil, sewage, garbage, and air emissions. All yachts must comply.
Flag State: The country whose laws govern a yacht — determined by where it is registered. Common yacht flags include Cayman Islands, Marshall Islands, Malta, and the British Virgin Islands.
Port State Controlalso: PSC: Inspections by foreign port authorities verifying that visiting vessels comply with international conventions including SOLAS, MLC, and MARPOL.
Y3 / Y4 Captain: MCA Yacht-route engineering and master licence categories. Y3 covers yachts to 500 GT; Y4 covers smaller. Higher numbers = larger tonnage limits.
ENG1: The UK MCA-recognised seafarer medical certificate, mandatory for working on commercial yachts. Valid two years; widely accepted across yachting.
STCWalso: Standards of Training, Certification and Watchkeeping: The IMO convention setting baseline training requirements for all seafarers — basic safety training, fire-fighting, first aid, sea survival, and security awareness.

Charter & Brokerage9 terms

Charter Yacht: A yacht offered for hire to paying guests, with crew included. Typically operates under commercial registration, MLC compliance, and a charter management company.
MYBA Agreement: The Worldwide Yachting Association charter contract — the global industry standard governing yacht charters, including APA, delivery, redelivery, and force majeure clauses.
APAalso: Advance Provisioning Allowance: A deposit of typically 25–35% of the charter fee covering fuel, provisions, dockage, and incidentals during the charter. Reconciled at the end with receipts.
Bareboat Charter: A yacht charter without crew or provisions — the charterer takes full operational responsibility. Contrast with crewed charter.
Central Agency: An exclusive listing arrangement where one yacht broker represents the owner, with all other brokers commission-sharing through that agent.
Sea Trial: An on-water test of a yacht's systems and performance, typically conducted before purchase or after a refit. Includes engine performance, manoeuvring, and stability checks.
Survey: A pre-purchase technical inspection of a yacht's hull, machinery, and systems by an accredited marine surveyor. Required for insurance and financing.
Brokerage Listing: A yacht offered for sale through a yacht brokerage. Listings include central agency, open listing, and net listing arrangements depending on the broker-owner relationship.
Closing: The final step of a yacht sale where ownership formally transfers, registration changes hands, and funds are released from escrow.

Marina & Dockage10 terms

Berth: An assigned space in a marina or harbour where a yacht is moored. Berth size, water depth, and shore-power supply determine which yachts a marina can accommodate.
Mediterranean Mooringalso: Med Mooring: A docking technique used in European marinas where the yacht's stern (or bow) is brought to the dock and held by an anchor or laid mooring line at the opposite end.
Stern-To: A Mediterranean mooring orientation with the yacht's stern facing the dock — most common because it provides easier guest access via the swim platform.
Bows-To: A Mediterranean mooring orientation with the yacht's bow to the dock — used in shallow stern conditions or when the yacht's design makes stern access impractical.
Lazy Line: A pre-laid mooring line attached to the seabed and run to the dock by marina staff, used in Mediterranean mooring instead of the yacht's own anchor.
Slip: A US/Caribbean term for a marina berth — typically a parking-bay style space between two finger piers, with shore power, water, and pump-out.
Shore Power: Electrical power supplied dockside, allowing a yacht to shut down its generators while berthed. Requires matching voltage, frequency, and current capacity.
Pump-Out: A facility for emptying a yacht's blackwater (sewage) holding tank. Mandatory in many no-discharge zones including most US coastal areas and the Mediterranean.
Provisioner: A specialised supplier delivering food, beverages, cleaning supplies, and yacht equipment to charters and private yachts at port.
Yacht Agent: A local representative arranging berthing, customs, immigration, fuel, provisioning, and itinerary logistics for visiting yachts in foreign ports.