Extended Operational and Trade Vocabulary

Offshore Wind O&M, CTVs and SOVs glossary

The offshore-wind O&M vocabulary: walk-to-work service operation vessels (Acta Auriga, Acta Centaurus), accessibility as a sea-state metric, active heave compensation on gangways, and the technician-transfer and DP terms. Grounds each term in the O&M campaign or the named SOV/CTV it belongs to.

393 defined terms.

Showing 250 on this page (page 1 of 2).

A

Accessibility: The percentage of time during which sea state and weather permit safe technician transfer from a CTV or SOV to a wind turbine boat landing or gangway.
Acoustic Doppler current profiler: Hull mounted instrument used during wind farm site surveys to measure water column current profiles for vessel approach planning.
Acta Auriga: Walk-to-work service operation vessel owned by Acta Marine, delivered in 2018 with an Ampelmann gangway and DP2 station keeping for North Sea wind farm support.
Acta Centaurus: Acta Marine W2W SOV delivered in 2019, sister to Acta Auriga, deployed on Borssele and Hollandse Kust wind farm O&M campaigns.
Acta Marine: Den Helder based Dutch shipowner operating a fleet of walk-to-work vessels, multicats, and CTVs serving North Sea offshore wind operations.
Active Heave Compensation: Crane/winch system that counters vessel heave in real time using hydraulics.
Active motion compensated gangway: Telescoping bridge between an SOV and a turbine transition piece whose actuators continuously cancel vessel roll, pitch, and heave to maintain a stationary tip.
Advanced Rescue Training: GWO ATR module qualifying wind technicians to perform vertical and confined space rescues from hub, nacelle, tower, and blade locations.
AEP: Annual energy production, the total electrical energy a wind turbine or wind farm delivers to the grid in a calendar year, expressed in megawatt hours or gigawatt hours.
Aerodynamic balance: Condition in which a turbine rotor produces equal lift across each blade, monitored during O&M to detect pitch misalignment.
Air gap: Vertical distance from the fuel surface to the top of the tank, used in ullage measurement.
Alignment laser: Optical tool used by service technicians to verify gearbox to generator coupling alignment after drivetrain repair.
Ampelmann A-type: Original parallelogram motion compensated gangway designed by Ampelmann Operations of Delft, widely used aboard SOVs for offshore wind technician transfer.
Ampelmann E1000: Electrically actuated motion compensated gangway with 1,000 kilogram payload rating used on smaller SOVs and CSOVs.
Ampelmann L-type: Long reach motion compensated gangway variant designed for high freeboard SOV to turbine transfers.
Ampelmann Operations: Delft based gangway manufacturer founded in 2008 supplying the Ampelmann family of motion compensated walkways to the offshore wind sector.
Anchor handling tug supply: Vessel class used to position spread moorings for cable-lay barges and floating accommodation units.
Anemometer: Instrument for measuring wind speed.
Annual service: Scheduled maintenance visit performed each calendar year on every wind turbine, comprising oil sampling, torque checks, and component inspections.
Approach angle: Heading at which a CTV pushes onto a turbine boat landing, typically within plus or minus 15 degrees of the prevailing wave direction.
Approach speed: Forward velocity of a CTV against the boat landing fenders, normally between two and four knots depending on swell and bow puffer design.
As-Built Drawings: Original construction plans used as reference for structural and gauging surveys.
ASN Marine: Submarine cable repair vessel operator providing fault locating and joint replacement services on offshore wind array and export cables.
Asset integrity management: Systematic program of inspections, monitoring, and interventions that preserves turbine and balance of plant reliability through the operating life.
Availability energy based: Reliability metric expressing the fraction of theoretical energy a turbine could have produced that it actually delivered, accounting for downtime weighted by wind resource.
Availability time based: Reliability metric expressing the fraction of clock hours during which a turbine was technically capable of generating, regardless of wind conditions.
Awareness training: Short induction module covering site specific risks and emergency procedures before any technician boards a CTV or SOV.

B

Backfilling: Post lay seabed restoration over a buried export or array cable, often performed by trailing suction hopper or jet sled.
Balance of plant: Wind farm assets other than the turbines themselves, including foundations, inter array cables, offshore substation, and export cable.
Barge Master: Dutch supplier of motion compensated platforms and cranes used aboard feeder barges and SOVs in wind O&M.
Basic Safety Training: BST, the combined STCW Regulation VI/1 package of PST, FPFF, EFA, and PSSR.
Basic Technical Training: GWO BTT modular course covering mechanical, electrical, hydraulic, and installation fundamentals for entry level wind technicians.
Bayards: Dutch aluminum structures specialist supplying gangways, helidecks, and accommodation modules to SOVs and CSOVs.
Beaufort scale: Empirical wind force scale 0-12.
Berthing pocket: Dedicated quayside space at an O&M port reserved for CTV moorings between shifts.
Bibby Marine: Liverpool based shipowner operating the WaveMaster class of motion compensated SOVs for offshore wind service.
Bibby WaveMaster 1: First in class Bibby Marine SOV delivered in 2017, equipped with an Uptime gangway and 90 technician berths.
Bibby WaveMaster Horizon: Bibby Marine SOV delivered in 2020, deployed on long term charter to East Anglia and German Bight wind farms.
Bilfinger Service: Multidiscipline industrial service contractor providing electrical and mechanical maintenance to offshore wind substations and turbines.
Blackout test: Annual exercise verifying that an offshore substation can re energize after total loss of auxiliary supply.
Blade bearing: Large slewing bearing connecting the blade root to the rotor hub, a recurring fault category requiring borescope inspection.
Blade inspection drone: Unmanned aerial vehicle equipped with high resolution cameras used to image rotor blades for leading edge erosion and laminate defects.
Blade leading edge erosion: Progressive surface degradation of the windward edge of a rotor blade caused by rain, hail, and particulate impact, repaired by leading edge tape or polyurethane shell.
Blade pitch motor: Electric or hydraulic actuator that rotates a rotor blade about its longitudinal axis for power and load control.
Blade repair rope access: IRATA qualified work at height technique used to perform leading edge, lightning receptor, and laminate repairs without external scaffolding.
Blade root: Cylindrical interface section bolting a rotor blade to the pitch bearing on the hub.
Blade tracking: Optical measurement of the relative tip positions of the three blades, used to detect aerodynamic imbalance.
BMT Nigel Gee: UK naval architecture practice (now part of BMT) active in large yacht design.
BOA: Basic O&M agreement, a Vestas service contract tier limiting the manufacturer's scope to scheduled maintenance and selected unscheduled work.
Boa Sub-C: Norwegian subsea contractor operating cable lay and repair vessels chartered into the offshore wind sector.
Boat landing: Steel ladder and fender structure on a turbine transition piece against which a CTV pushes for technician transfer.
Borescope: Flexible optical probe used by service technicians to inspect gearbox internals through a small access port without disassembly.
Bourbon: French offshore vessel operator whose subsea fleet supports wind farm cable repair and survey campaigns.
Bow puffer: Pneumatic rubber fender at the bow of a CTV that absorbs impact during high speed push on to a turbine boat landing.
Brake disc: Steel disc mounted on the high speed shaft of a wind turbine gearbox, gripped by calipers during rotor parking.
Bremerhaven: German port and industrial cluster supporting offshore wind logistics and increasingly green hydrogen demonstrators.
Brest: French Atlantic naval port and arsenal developed under Richelieu and Colbert in the seventeenth century.
Briggs Marine: Burntisland based marine services contractor offering subsea cable repair and aids to navigation work to offshore wind clients.
BST: Basic Safety Training, mandatory STCW VI/1 short course bundle for all seafarers with designated safety duties.
BTT: Basic Technical Training, the GWO module set covering mechanical, electrical, hydraulic, and installation skills.
Bunkering: supplying fuel to a vessel by barge, truck, or shoreside pipeline.

C

Cable burial assessment: Survey campaign verifying that an array or export cable remains buried to its target depth of cover.
Cable depth of burial: Vertical distance between the seabed surface and the top of the cable armor, typically targeted at one to three meters.
Cable fault locator: Time domain reflectometer or pulse echo instrument used to pinpoint a break or insulation failure on an offshore cable.
Cable laydown area: Quayside zone at an O&M port for storing spare cable lengths and joint kits ahead of repair campaigns.
Cable repair vessel: Specialized ship equipped with cable tanks, jointing chambers, and a stern wheel or chute for recovering, jointing, and re laying subsea cables.
Calibration certificate: Document certifying calibration of cargo or bunker measurement systems.
Capacity factor: Ratio of actual annual energy production to the maximum possible if a turbine operated at rated power continuously.
Catamaran: Twin-hull vessel with high transverse stability.
CBM: Cubic meter, freight volume measure.
Centreline shaft alignment: Optical or laser based check of the geometric alignment of generator and gearbox shafts on a turbine drivetrain.
Charter day rate: Daily fee paid by a wind farm owner to the CTV or SOV owner under a time charter.
CO2 fire suppression: Fixed fire fighting system in turbine nacelles, charged with carbon dioxide and inhibited during technician occupancy.
Cold work: Maintenance activity performed without spark or flame sources and outside hot work permit controls.
Commissioning SOV: CSOV variant of the service operation vessel optimized for the commissioning phase, with enhanced spare parts storage and tool workshops.
Condition based monitoring: See CBM, the predictive maintenance philosophy using real time sensor data to schedule interventions.
Confined space entry: Permit controlled procedure for technicians entering turbine towers, hub, or transition piece voids classified as confined spaces.
Confined space rescue: GWO ATR competency covering casualty extraction from hub, nacelle, and tower confined spaces.
Coupling change out: Replacement of the flexible coupling between gearbox and generator, often the trigger for major drivetrain interventions.
Crane swap: Replacement of the service crane in the nacelle, a routine major operation requiring an external jack up or SOV.
Crew change: Replacement of crew members in port.
Crew Transfer Vessel: Small high speed catamaran transferring technicians from port to turbines during construction and O&M.
CSOV: Commissioning Service Operation Vessel, a category emerging in the late 2010s for vessels supporting the commissioning phase of new wind farms.
CTV: Crew transfer vessel; small catamaran transferring wind technicians.
CTV operator: Company owning or chartering CTV tonnage and providing crewing, scheduling, and HSE management to wind farm clients.
Cuxhaven: German pilot station at the mouth of the River Elbe where Elbe pilots board for the Hamburg passage.
CWind: Global Marine subsidiary providing CTVs, including the hybrid Pioneer class, and turbine high voltage commissioning services.
CWind Pioneer: Hybrid hydrogen and diesel CTV operated by CWind, demonstrating low emission propulsion in the wind farm transfer role.
Cyclic loading: Repeated load actions on offshore wind structures from wind, wave, and operational moments considered in fatigue design.

D

Damen FCS 2710: Damen Fast Crew Supplier of 27 meter length used widely as a workhorse CTV in European wind farms.
Damen FCS 3008: 30 meter Damen Fast Crew Supplier with extended range and accommodation for longer transit O&M routes.
Damen FCS 3508: 35 meter aluminum CTV in the Fast Crew Supplier line, designed for distant offshore wind sites.
Damen Shipyards: Dutch shipbuilder supplying CTVs, multicats, and SOVs to the offshore wind sector from Gorinchem and partner yards.
Day rate: See charter day rate.
Deep cycle battery bank: Battery installation aboard hybrid CTVs and SOVs providing peak shaving and harbor maneuvering power.
DEME Subsea: Subsea services arm of the DEME Group offering ROV survey and cable burial assessment to wind farms.
Departure window: Period each morning during which a CTV may sail to meet the technician shift start at the turbines.
Deutsche Windtechnik: Independent service provider known as DWT, performing multi brand turbine maintenance across European offshore wind farms.
Differential GPS: Augmented satellite positioning system used by CTVs and SOVs to achieve sub meter accuracy near turbine structures.
Dock master: Officer responsible for dock operations.
Doppler velocity log: Acoustic sensor measuring ship's speed over ground.
DP1: Dynamic positioning class with no redundancy; loss of one element can cause position loss.
DP2: Dynamic positioning class tolerant to any single fault excluding loss of compartment.
DP3: DP class tolerant to any single fault including fire or flood in one compartment.
Drivetrain: Mechanical assembly of main shaft, main bearing, gearbox, and generator inside a wind turbine nacelle.
Drone Inspection: Use of unmanned surface vehicles and AUVs to inspect pipeline corridors and cable landfalls without dedicated DSVs.
DWT: Deadweight tonnage; conventional LNG carriers typically 80,000 to 100,000 DWT.

E

Edda Brint: Edda Wind CSOV equipped for low emission operations including ammonia readiness, delivered in the early 2020s.
Edda Mistral: Edda Wind SOV delivered in 2018, operated under long term charter to North Sea wind farm clients.
Edda Passat: Edda Wind SOV delivered in 2018, sister to Edda Mistral, supporting German Bight projects.
Edda Sun: Edda Wind CSOV from the next generation series with hybrid propulsion and a motion compensated gangway.
Edda Wind: Norwegian shipowner specializing in SOVs and CSOVs for offshore wind, headquartered in Haugesund.
Eemshaven: Dutch port serving as offshore wind marshaling base for German and Dutch North Sea projects.
Eidesvik: Norwegian shipowner with SOV tonnage on long term charter to offshore wind operators in the North Sea.
Endoscopy: Borescope based internal inspection of a gearbox or hub without major disassembly.
Energy based availability: See availability energy based.
Engine room watchkeeping: Continuous monitoring of an SOV's main and auxiliary plant by marine engineers on a watch rotation.
Enhanced First Aid: GWO module extending BST first aid to advanced casualty care for offshore wind technicians.
Environmental monitoring: Collection of metocean, marine mammal, and benthic data during operations as required by the wind farm consent.
EPC handover: Formal transfer of the wind farm from the construction contractor to the operations team after performance testing.
Esbjerg: Danish North Sea port acting as a primary marshaling base for European offshore wind installation.
Escape Route: Required under SOLAS II-2/13.
Esvagt: Danish vessel owner providing service operation vessels to offshore wind operators including Orsted and Siemens Gamesa.
Esvagt Faraday: ESVAGT SOV delivered in 2015, the first purpose built service operation vessel constructed for offshore wind.
Esvagt Mercator: ESVAGT SOV delivered in 2017, deployed on Belgian wind farm cluster support.
Esvagt Njord: ESVAGT SOV delivered in 2016, supporting North Sea wind farm O&M campaigns.
Excursion: Maximum motion amplitude of cargo permitted before lashing failure.
Export Cable: High-voltage submarine cable carrying power from an offshore substation to the onshore grid connection point.

F

Fast Crew Supplier: Damen product family of aluminum monohull and catamaran CTVs in 19 to 35 meter lengths.
Fault category: Standardized classification used in O&M reliability reporting, covering gearbox, generator, blade, control, electrical, and other systems.
Fault tree analysis: Top-down deductive technique mapping how a casualty could occur from contributing failures.
FCS 2710: See Damen FCS 2710.
FCS 3008: See Damen FCS 3008.
FCS 3508: See Damen FCS 3508.
Fender pad: Replaceable rubber section on the CTV bow puffer in contact with the turbine boat landing.
Field service representative: Manufacturer's technician dispatched to a wind farm to perform specialist repairs and warranty interventions.
Fire Awareness: GWO BST module covering fire prevention, detection, and first response in offshore wind environments.
First Aid: STCW Regulation VI/4 paragraph 1 medical first aid for officers with designated duties.
Flag State: State of the ship's nationality, with jurisdiction under UNCLOS Article 94.
Forklift truck: Quayside lift truck used at O&M ports to handle spare parts, tooling crates, and consumables.
Foundation inspection: Periodic survey of monopile, jacket, or gravity base structures, including corrosion, fatigue, and scour checks.
Freeboard: Distance from waterline to freeboard deck, governed by the Load Lines Convention but referenced in SOLAS.
Frequency converter: Power electronic equipment converting AC to AC at variable frequency for shaft generators and motor drives.
Full Service Agreement: Highest tier of OEM service contract under which the manufacturer assumes most O&M activities and a guaranteed availability.

G

Gangway: Movable ramp or bridge for boarding.
Gangway tip: Distal end of the gangway resting against the turbine landing, maintained stationary by motion compensation.
GE Vernova OPS: Operations and Performance Services business of GE Vernova providing service to GE wind turbines under FSA and LTSA contracts.
Gearbox endoscopy: See endoscopy.
Gearbox failure: Recurring fault category in wind turbines involving bearings, gears, or lubrication systems and often requiring component change out.
Gearbox oil sample: Periodic lubricant sample drawn from the turbine gearbox and analyzed for wear metals, water, and viscosity.
General Arrangement: Top-level 2D plan and section drawing produced from NAPA Designer, AVEVA Marine, or Foran.
Generator bearing: Rolling element bearing supporting the generator rotor, a common fault category in megawatt class turbines.
Generator change out: Major replacement operation removing and installing a turbine generator, normally requiring a jack up or heavy lift SOV.
Generator slip ring: Rotating electrical contact in doubly fed induction generators, requiring brush inspection at scheduled intervals.
Geographic information system: Digital mapping environment used by O&M planners to manage assets, cables, and exclusion zones.
Global Wind Organisation: International standards body that publishes the GWO training requirements adopted across the offshore wind industry.
Global Wind Service: Independent multi brand wind turbine service contractor headquartered in Denmark, supplying technicians worldwide.
Grease unit: Automatic lubrication system in a turbine pitch or main bearing, refilled during scheduled visits.
Great Yarmouth: UK port on the Norfolk coast supporting offshore wind, tidal, and CCS-related logistics in the southern North Sea.
Grimsby Royal Dock: Lincolnshire dock complex serving as the O&M base for several major UK offshore wind farms, including Hornsea and Race Bank.
GWO: Global Wind Organisation; sets BST and BTT wind training standards.
GWS: See Global Wind Service.

H

Hartshorn Marine: UK CTV operator providing crew transfer services to East Coast wind farms.
Heave Compensation: Correction for vertical platform motion in multibeam surveying.
Heavy lift crane: Large capacity crane aboard a jack up or floating heavy lift vessel used for component change outs on operating turbines.
Helicopter hoisting: Technique by which a helicopter winches technicians directly to a turbine nacelle roof platform.
Helideck: Flight deck on surface combatant sized for embarked helicopter.
Hi Force: Hydraulic equipment supplier providing tensioning, torquing, and cable repair tools to the offshore wind sector.
High speed shaft: Output shaft of the turbine gearbox driving the generator, subject to alignment and bearing inspection.
Hoglund: Norwegian marine automation supplier providing energy management systems to hybrid SOVs and CSOVs.
Hot work permit: Yard/onboard permit before welding/cutting.
Houlder Aktiv Gangway: Motion compensated gangway designed by Houlder, deployed on several SOVs for offshore wind work.
HSE management plan: Project specific document governing health, safety, and environmental controls during wind farm O&M.
Hub: Major transhipment port served by multiple feeder services.
Hull King George Dock: Humberside dock hosting O&M operations for Yorkshire and Lincolnshire coast wind farms.
Hybrid Propulsion: Combination of multiple propulsion sources for efficiency.
Hydraulic power unit: Pump and tank assembly providing pressurized fluid to gangway, crane, and pitch system actuators.
Hydrogen Fuel Cell: Electrochemical device producing electricity from hydrogen.

I

In service training: On the job familiarization for new technicians joining a wind farm operations team.
Incident investigation: Structured root cause analysis carried out after a near miss, lost time injury, or equipment damage event.
Induction: Formal site briefing covering hazards, emergency procedures, and local rules for all personnel before first attendance.
Inflatable life raft: Survival craft carried by every CTV and SOV in capacity sufficient for all persons on board.
Infrared thermography: Inspection technique used on transformer windings, switchgear, and electrical connections to detect hot spots.
Insulation resistance test: Routine electrical IR test in PMS.
Inter-array cable: Synonym for array cable.
Interface management: Coordination of contracts, schedules, and technical boundaries between OEMs, owners, vessel operators, and authorities.
IRATA Level 1: Industrial Rope Access Trade Association entry level certification for working at height under supervision.
IRATA Level 2: Intermediate rope access certification authorizing rigging of anchors and rescue of an injured Level 1.
IRATA Level 3: Supervisory rope access certification required of any rope access team leader on offshore wind blade work.

J

Jacket inspection: Structural inspection of a steel jacket foundation, including joints, anodes, and grouted connections.
Jacket transition piece: Connecting structure between a jacket foundation and the turbine tower flange.
Job hazard analysis: JHA or JSA, task risk analysis tool.
Joint integrity management: Discipline governing the verification and recording of bolted and flanged joints on turbine and balance of plant equipment.
Joint kit: Pre assembled materials needed to remake a subsea cable joint, stored ashore until a repair campaign.
Jumper cable: Temporary cable bridging two switchboard points during repairs, controlled by permit.

K

Kenz Figee: Dutch crane and lift equipment supplier providing cranes and gangways to SOVs and offshore wind installation vessels.
King post crane: Vertical pedestal crane mounted on the deck of an SOV or CSOV for tool and parts handling.
Knot: One nautical mile per hour.

L

Laydown deck: Open deck area aboard an SOV used to store spare parts, containers, and tooling for offshore campaigns.
Leading edge protection: Polyurethane tape, shells, or coatings applied to blade leading edges to resist erosion.
Leading edge repair: Process of restoring a degraded blade leading edge using filler, laminate, and protective coating.
Lessons learned: Documented insights captured after a campaign or incident and circulated within the O&M organization.
Life jacket: Personal flotation device worn during embarkation, transfer, and outdoor work aboard CTVs and SOVs.
Lifeboat: Boat carried for emergency abandonment.
Lifting plan: Documented procedure for any nonroutine crane lift, covering loads, rigging, and exclusion zones.
Light off: Initial powering and synchronization of a wind turbine to the grid after commissioning.
Lightning protection system: Receptor, down conductor, and earthing arrangement protecting turbine blades and electronics from strike damage.
Lightning strike: Recurring blade fault category producing damage at receptors, in laminate, or via internal arcing.
Lloyd's Register: LR, UK-headquartered classification society and IACS member founded 1760.
Lockout tagout: Energy isolation procedure controlling work on machinery.
Long term service agreement: LTSA, multiyear contract under which the turbine OEM delivers scheduled and corrective maintenance to defined performance levels.
Lowestoft: UK port serving operations and maintenance bases for southern North Sea offshore wind farms.
LTSA: See long term service agreement.
Lubricant analysis: Laboratory testing of oil and grease samples for wear metals, water content, and additive depletion.

M

Main bearing: White metal lined bearing supporting crankshaft journals in the bedplate.
Main shaft: Slow speed shaft transmitting rotor torque to the gearbox or directly to the generator in direct drive machines.
Maintenance plan: Document defining the scheduled and condition based interventions applied to each turbine and balance of plant asset.
Manor Renewable Energy: UK CTV and personnel supplier providing wind farm support across Europe.
Manual Handling: GWO BST module covering safe lifting and handling techniques for wind technicians.
MaXccavator: Mass flow excavation tool used to expose or rebury subsea cables on wind farm sites.
Mean time between failures: MTBF, reliability metric averaging the operating time between consecutive failures of a component.
Mean time to repair: MTTR, average elapsed time to complete a corrective intervention and return a turbine to service.
MEDIVAC: Medical evacuation flight to remove casualty from offshore installation.
Metocean data: Combined meteorological and oceanographic dataset used in O&M planning, including wind, wave, current, and visibility statistics.
MHI Power: Mitsubishi Heavy Industries power business providing service support for legacy MHI Vestas turbines.
MingYang Service: Service arm of MingYang Smart Energy supporting installed MingYang wind turbines in China and Europe.
Monopile: Single tubular steel pile foundation driven into the seabed, the dominant offshore wind foundation type to date.
MOTION: Trade name applied to certain motion compensated systems used on offshore wind support vessels.
Motion compensation: Generic term for systems that cancel vessel motion to maintain a stationary platform, gangway tip, or crane hook.
MPI Discovery: MPI Workboats CTV deployed on UK and European wind farm operations.
MPI Offshore: Atlas Renewable subsidiary operating jack ups and supporting wind farm O&M from UK ports.
MPI Workboats: CTV operator and naval architecture practice supplying catamaran crew boats to the wind sector.
MTBF: See mean time between failures.
MTTR: See mean time to repair.
Multi brand service: Independent service provider model offering O&M across turbine makes rather than tied to a single OEM.

N

Nacelle: Housing on top of a wind turbine tower containing the drive train, generator, and converter.
National Hyperbaric Centre: UK facility used for some specialist subsea intervention training relevant to cable repair campaigns.
Nautical mile: 1852 m international nautical mile.
Near miss: Event with potential for casualty avoided by chance or intervention; ISM Code 9.1 reporting expected.
Negative pitch: Blade pitch angle past the feather position, used in controlled stopping sequences.
Network operations center: Onshore facility monitoring turbine SCADA, condition data, and vessel positions for a wind farm portfolio.
New Bedford: Massachusetts whaling port that surpassed Nantucket as the leading American whaling base by the 1820s.
New London: Connecticut port developing O&M infrastructure for southern New England offshore wind farms.
Nigel Gee: See BMT Nigel Gee.
No-go area: Area on passage plan excluded from passage.
Noise survey: Acoustic measurement campaign verifying compliance with marine mammal protection requirements during operations.
Northern Offshore Services: Frederikshavn based CTV and SOV operator known as NOS, providing wind farm support across Europe.
NOS: See Northern Offshore Services.
NOS Sigyn class: Series of CTVs operated by Northern Offshore Services, designed for North Sea conditions.
Notice to mariners: NM, updates to nautical charts and publications.