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# KRM Yacht Refit & Rebuild: KRM Yacht Refit is Türkiye’s first and leading professional facility exclusively dedicated to the refit and rebuild of superyachts. Established in 2010, the company has developed a strong reputation for delivering high- quality services tailored to the specific needs of superyacht owners. With over 15 years of experience and more than 200 successfully delivered projects, KRM Yacht is recognized for its reliability, innovation, and commitment to excellence in the global superyacht refit sector.
KRM Yacht operates in Tuzla, Istanbul, one of the world’s premier maritime hubs offering, fast and efficient service thanks to its proximity to top suppliers, subcontractors, and authorized services. The company’s team of over 100 professionals, including project managers, engineers, naval architects, and skilled craftsmen, ensures that every project is completed to the highest standards. Conveniently located just 15 minutes from Sabiha Gökçen International Airport, the Tuzla-based facility is surrounded by restaurants, hotels, shopping malls, and other amenities, providing easy access and acomfortable environment for captains and crew during refit projects.
KRM Yacht is the sole member of the prestigious ICOMIA Superyacht Refit Group in Türkiye, aligning itself with the world’s top refit and repair yards. Furthermore, KRM Yacht is the only facility in Türkiye with all three major ISO certifications, ISO 9001, ISO 14001, and ISO 45001, in the fields of refit, repair, and maintenance, awarded by LRQA, demonstrating its commitment to quality, safety, and environmental responsibility.
KRM Yacht’s state-of-the-art facility in Tuzla, Istanbul, offers tax-free services for foreign-flagged vessels, making it an ideal choice for international clients. The facility is equipped with:
– 900-ton travel lift
– 300-ton travel lift
– 40,000 m² hard-standing area, accommodating up to 50 vessels
– 2500 m² workshop area and 800 m² storage space
– Repair quays for up to 15 superyachts.
## Sitemaps
[XML Sitemap](https://krmyacht.com/sitemap_index.xml): Includes all crawlable and indexable pages.
## Posts
- [KRM Yacht Appointed as Baglietto Service Point in Turkey](https://krmyacht.com/news/baglietto-service-point-turkey/): KRM Yacht Refit & Rebuild is pleased to announce that it has been appointed as Baglietto’s Service Point in Türkiye, providing Baglietto owners, captains, and representatives with a dedicated local point of contact for after-sales support, technical coordination, and warranty-related services.
- [Paint Inspection in a Yacht Refit](https://krmyacht.com/blog/paint-inspection/): Paint inspection is the control layer that checks whether surface preparation, application conditions, film build, cure, and final coating condition are good enough for the yacht to leave the yard with a defensible finish standard.
- [Owner’s Representative in Yacht Refit: Meaning and Responsibilities](https://krmyacht.com/blog/owners-representative/): An owner's representative is the person or team appointed to speak for the yacht owner during a refit, rebuild, or new-build project The role keeps the owner's brief clear, carries decision authority within agreed limits, and follows that position through scope reviews, variations, approvals, testing, and handover.
- [Hull Extension on a Yacht](https://krmyacht.com/blog/hull-extension/): A hull extension is a structural conversion that increases the yacht’s length and adds new buoyancy, new structure, and usually new usable volume. In yacht projects, the extension is often carried aft, though the technical burden depends on where the new section is inserted and how far the original platform is being reworked.
- [Port State Control (PSC): What It Means After a Yacht Refit](https://krmyacht.com/blog/port-state-control-psc/): For yachts moving internationally under the relevant statutory framework, PSC matters because the yacht can leave the yard looking finished while still being operationally exposed at the next port call. A refit only closes cleanly when the physical works, certificate trail, onboard records, and crew readiness all line up. That is why PSC readiness sits inside both the wider superyacht refit path and the project’s tests and surveying path.
- [Distress Signaling at Sea, Explained For Yachts](https://krmyacht.com/blog/distress-signaling-at-sea/): When mariners talk about distress signaling, they mean the internationally recognized ways a vessel or person at sea communicates that immediate assistance is required. These signals are not casual attention-getters. They are a tightly defined set of visual, sound, and radio alerts that activate the fastest possible search-and-rescue response while helping rescuers home in on your position. The legal backbone for these signals sits under the International Regulations for Preventing Collisions at Sea (COLREG) and the International Maritime Organization (IMO), with carriage and performance requirements reinforced by SOLAS for commercial shipping. COLREG Rule 37 and Annex IV compile the list of signals that indicate distress and need of assistance.
- [Corrosion Protection on Yachts](https://krmyacht.com/blog/corrosion-protection/): Salt, oxygen, warmth, and dissimilar metals make yachts a perfect laboratory for corrosion. Left alone, they quietly pit shafts, blister coatings, and thin plating, then they show up as costly surprises during refit. Corrosion protection is the coordinated strategy that keeps your hull, appendages, and onboard systems safe, efficient, and presentable, whether you run a busy charter superyacht or a family cruiser. It blends coatings, cathodic protection, smart materials, and inspection into one practical program, not a single product.
- [Yacht Fuel Polishing System: Stored Fuel Recovery and Release Evidence](https://krmyacht.com/blog/fuel-polishing-system/): A yacht fuel polishing system is a recirculation and cleanup loop used to recover stored fuel condition before that fuel is asked to support engines or generators under real demand. The system works on contamination that lives in storage: water, sludge, particulate load, unstable tank bottoms and the wider residue pattern that builds during lay-up, low-use periods and neglected tank housekeeping.
- [What is a Shore Transformer?](https://krmyacht.com/blog/shore-transformer/): A shore transformer is a purpose-built isolation transformer installed between the marina pedestal and your yacht’s AC distribution. It performs two main jobs. First, galvanic isolation, it breaks the direct metal path between shore earth and the yacht’s bonding system. This helps prevent stray-current and galvanic corrosion of underwater metals. Second, voltage adaptation, it steps voltage up or down so the yacht’s system sees the correct line voltage, for example adapting 230 V single phase or 400 V three phase supplies to the boat’s design voltage.
- [Yacht Insulation Resistance Testing: Readings, Risk and Yard Use](https://krmyacht.com/blog/megger-test/): An insulation resistance (megger) test checks whether electrical insulation is still separating conductors from each other and from earth. A megohmmeter applies a controlled DC test voltage to an isolated circuit, then reads the resistance in megaohms. High resistance supports confidence in the insulation condition. Low resistance points toward moisture, contamination, damaged cable, tired windings, poor terminations or connected equipment affecting the result.
- [Flag State Rules in a Yacht Refit](https://krmyacht.com/blog/flag-state-rules/): Flag state rules are the statutory rules and certification obligations that apply to a yacht through the Administration whose flag the vessel flies.
- [Yacht Main Engine Alignment: Mounts, Chocks and Running Proof](https://krmyacht.com/blog/main-engine-alignment/): Yacht main engine alignment sets the installed relationship between the main engine, mounts, chocks, foundation, gearbox or output flange and the shaftline that receives power. It is a machinery-side alignment decision, but the effect reaches the whole propulsion train.
- [Cybersecurity on Yachts](https://krmyacht.com/blog/cybersecurity-on-yachts/): Cybersecurity on yachts is no longer optional. With the increasing reliance on advanced navigation systems, onboard Wi-Fi, and interconnected technologies, yachts have become floating digital hubs. This makes them attractive targets for hackers, and the consequences can range from minor disruptions to full-scale operational shutdowns.
- [What is PTO (Power Take-Off)?](https://krmyacht.com/blog/power-take-off/): If you spend time around yachts, whether as a crew member, engineer, or simply someone passionate about how these complex vessels work, you’ve probably heard the term PTO or Power Take-Off. It’s one of those technical phrases that might sound intimidating at first, but understanding it can give you a deeper appreciation of the engineering that keeps a yacht operating smoothly.
- [Yacht Bow Thruster: Low-Speed Control, Integration and Redelivery Proof](https://krmyacht.com/blog/bow-thruster/): A bow thruster is a low-speed manoeuvring device that gives lateral control at the bow when the yacht is docking, leaving berth, holding position against wind or current, or working through tight marina movements. In yacht refit terms, the useful definition is stricter than "extra pushing power." A bow thruster is an installed control package whose real value depends on tunnel or retractable geometry, drive condition, power supply, control response and the proof gathered after the work is complete.
- [Future of superyacht refits: Sustainability and smart tech](https://krmyacht.com/press/future-of-superyacht-refits-sustainability-and-smart-tech/): With the yacht refit market evolving faster than ever, shipyards are under pressure to keep up with rising client expectations. Sustainability, advanced technology, and operational transparency have shifted from being optional extras to defining factors in determining where and how yacht owners choose to refit.
- [Why Rebuild is Better Than Newbuild in Yachting](https://krmyacht.com/blog/why-rebuild-is-better-than-newbuild/): For yacht owners, captains, and naval architects, the choice between commissioning a newbuild yacht or investing in a rebuild project is one of the most critical decisions they face. While newbuilds have traditionally symbolized the ultimate expression of custom yacht ownership, rebuilds are increasingly proving to be the smarter, faster, and more sustainable path.
- [Antifouling on a Yacht](https://krmyacht.com/blog/antifouling/): Antifouling is the underwater coating system used to control marine growth on the hull and appendages. On a yacht, that means reducing the drag, fuel penalty, performance loss and cleaning burden that come with algae, slime, barnacles and other attached organisms.
- [What is a Redressor?](https://krmyacht.com/blog/redressor/): If you hear the word redressor on a yacht, in a yard conversation, or in some supplier language, the equipment being described is usually a rectifier or a rectifier-based battery charger. That distinction matters. In English-language marine manuals, specifications, and fault reports, rectifier or battery charger is the term you are far more likely to see.
- [Yacht Propulsion System: From Engine Power to Proven Thrust](https://krmyacht.com/blog/propulsion-system/): A yacht propulsion system is the chain that turns engine power into controlled thrust. It includes the prime mover, gearbox or transmission route, couplings, shaftline, bearings, seals, stern gear, propeller or thrust device, controls, cooling support, lubrication support, monitoring and the test evidence that proves the yacht is ready to leave the yard.
- [Classification Society: Class, Flag, and Refit Approval Explained](https://krmyacht.com/blog/classification-society/): A classification society is a technical organisation that sets rules for the design, construction, and survey of ships and yachts, then verifies whether a vessel meets those rules. In yacht work, "class" usually covers the hull structure, machinery, electrical systems, stability-related items, and other safety-critical parts of the vessel.
- [What is Paint System Application?](https://krmyacht.com/blog/paint-system-application/): Whether you’re involved in yacht ownership, maintenance, or refit planning, the finish of a yacht says a lot. A sleek, mirror-like hull or superstructure isn’t just about style, it’s about protection, performance, and value. That’s where paint system application comes in. It’s not just “painting the boat,” but a carefully planned, layered process that plays a key role in both aesthetics and long-term durability.
- [Yacht Engine Overhaul: Internal Condition Reset and Redelivery Proof](https://krmyacht.com/blog/engine-overhaul/): Yacht engine overhaul is a controlled rebuild of the engine's internal wear condition. The scope reaches far enough into the machinery to inspect, measure, renew, reassemble and prove the engine as a service-ready unit inside the yacht's wider propulsion route.
- [What is Ballast Water Treatment?](https://krmyacht.com/blog/ballast-water-treatment/): If you’ve spent time around yachts or commercial vessels, you may have heard about ballast water and increasingly, ballast water treatment systems. While it might sound like a niche technical detail, it's actually a topic with serious environmental and operational implications, especially for those involved in yacht operations, management, or refits. In fact, ballast water is more than just water in the hull; it’s part of a global conversation about protecting marine ecosystems and meeting international regulations.
- [NDT in a Yacht Refit](https://krmyacht.com/blog/ndt/): NDT, or non-destructive testing, is a group of inspection methods used to check the condition of a material, weld, component, or structure without damaging it. In yacht refit and repair, NDT is used to find cracks, corrosion loss, weld discontinuities, laminate issues, and other hidden defects before work is closed out.
- [Hull Thickness Measurement in a Yacht Refit](https://krmyacht.com/blog/hull-thickness-measurement/): Hull thickness measurement is the process of checking how much metal remains in the yacht’s plating and related structural areas after years of corrosion, wear, coating breakdown, impact, or localized damage.
- [Yacht Shaft Alignment: Geometry, Load and Redelivery Proof](https://krmyacht.com/blog/shaft-alignment/): Yacht shaft alignment sets the working relationship between the gearbox or output coupling, shaftline, bearings, seals, stern tube, brackets and propeller. The aim is to let the shaftline carry torque and thrust through the yacht without forcing abnormal load into bearings, seals, couplings, gearbox output, mounts or foundations.
- [New Build vs Refit: Choosing the Right Superyacht Project Route](https://krmyacht.com/blog/new-build-vs-refit/): New build and refit solve different ownership problems. A new build starts with a fresh platform, a full specification path and a long design-to-delivery route. A refit starts with an existing yacht and asks how much value, reliability, capability and owner fit the yard period can recover or create.
- [Refit vs Retrofit: How Each Word Shapes a Yacht Yard Brief](https://krmyacht.com/blog/refit-vs-retrofit/): Refit and retrofit both describe change on an existing yacht, yet they point to different project boundaries. A refit is the wider yard period: renewal, repair, upgrade, correction, reconfiguration, testing, close-out and redelivery across a defined scope. A retrofit is a more targeted integration: a new or modified capability fitted into a yacht after the original build.
- [Yacht HVAC: Climate Control, Humidity Management and Commissioning Proof](https://krmyacht.com/blog/hvac/): Yacht HVAC is the climate-control system that keeps cabins, guest areas, crew spaces and technical zones inside a usable temperature and humidity envelope while the yacht moves through changing sea, weather and occupancy conditions. In refit work, HVAC means far more than cold air. It is an installed system of plant, pumps, seawater cooling, air handling, ducting, controls, drains and operating proof.
- [Custom Yacht vs Production Yacht: Which One Is Right for You?](https://krmyacht.com/blog/custom-yacht-vs-production-yacht/): One of the most important decisions a prospective yacht owner will face is this: Should you build a custom yacht from scratch, or choose a production yacht from an established model line? While both paths lead to ownership, they offer vastly different experiences, capabilities, timelines, and risks. Understanding the real distinctions is key to aligning your investment with your expectations.
- [Osmosis Treatment on a GRP Yacht](https://krmyacht.com/blog/osmosis-treatment/): Osmosis treatment is the repair process used when a GRP or GFRP hull develops osmotic blistering and related laminate degradation after long exposure to water. In yacht work, the subject sits somewhere between composite diagnosis, repair planning and underwater coating rebuild.
- [Yacht Refit Cost: How Budget Forms Before the Yard Period](https://krmyacht.com/blog/cost-to-refit-a-yacht/): The cost to refit a yacht forms around scope, condition, access, proof and redelivery expectation. Length matters, but length alone gives a weak budget picture. A cosmetic refresh, a paint period, a machinery renewal, an interior rebuild and a class-sensitive superyacht refit do not create the same commercial exposure.
- [Sea Trial: What it Proves After a Yacht Refit](https://krmyacht.com/blog/sea-trial/): A sea trial is the controlled underway verification phase that confirms whether the yacht performs as expected after the relevant works, repairs, renewals, or modifications have been completed.
- [Yacht Stabilizer: Roll Control, System Integration and Sea Trial Proof](https://krmyacht.com/blog/stabilizer/): A yacht stabilizer is a roll-control system that reduces vessel motion and protects comfort, operability and confidence on board. In yacht work the term most often points to fin-based or gyroscopic systems, but the useful engineering meaning sits above product type: the stabilizer is an installed motion-control package that senses roll, generates correcting force and keeps doing it in the yacht's real operating environment.
- [Yacht Refit Brief: How Owner Intent Becomes a Yard Plan](https://krmyacht.com/blog/refit-brief/): A yacht refit brief gives the owner side and the yard a shared starting point before pricing, planning and execution begin. It explains the project objective, affected areas, known condition, constraints, priorities, decision structure and expected handover condition. The brief turns intention into a yard conversation that can be tested, priced, sequenced and governed. Where the package is already widening into a larger commercial yard period, the service-level route sits under superyacht refit.
- [Dry Docking: What It Means in a Yacht Refit](https://krmyacht.com/blog/dry-docking/): Dry docking is the controlled process of taking a yacht out of the water so the underwater body, appendages, shell openings, coatings, and related systems can be inspected, maintained, repaired, and verified.
- [Fairing in a Yacht Refit](https://krmyacht.com/blog/fairing/): Fairing is the surface-correction work that brings a hull or superstructure back to a clean, controlled shape before the coating system is built over it.
- [Superyacht Refit Planning Guide](https://krmyacht.com/blog/superyacht-refit-planning-guide/): Superyacht refit planning turns an owner objective into a controlled yard period. It gives the owner, captain, yacht manager, representative and yard a shared route through scope maturity, tender assumptions, procurement, approvals, live execution, commissioning and redelivery.
- [Yacht vs Boat vs Ship](https://krmyacht.com/blog/yacht-vs-boat-vs-ship/): In maritime circles, the terms "yacht," "boat," and "ship" are often used interchangeably, but for professionals and stakeholders in the yachting industry, these distinctions are more than semantics. Whether you're overseeing fleet operations, advising clients on vessel acquisitions, or designing next-generation watercraft, understanding the fundamental differences between a yacht, a boat, and a ship is crucial.
- [Types of Yachts Explained](https://krmyacht.com/blog/types-of-yachts-explained/): The term “yacht” often conjures images of luxury, freedom, and cutting-edge design but not all yachts are created equal. For owners, charterers, and industry stakeholders, understanding the different types of yachts is critical when making operational, financial, or lifestyle decisions. From high-performance motor yachts to transoceanic sailing vessels, the variety of yacht categories reflects a diversity of functions, aesthetics, and technical configurations.
- [What is Yacht Refit?](https://krmyacht.com/blog/what-is-yacht-refit/): Yacht refit is a planned yard period that renews, upgrades or reconfigures part of an existing yacht so the vessel returns to service in better technical, operational or presentation condition.
- [KRM Yacht Launches a New Digital Experience: Our New Website is Live!](https://krmyacht.com/news/our-new-website-is-now-live/): We are proud to announce the launch of KRM Yacht’s brand-new website — a fresh, modern, and fully optimized digital platform that reflects our commitment to transparency, user experience, and excellence in the superyacht refit industry.
- [First glimpse at redesign of classic 36m Heesen yacht Opus II](https://krmyacht.com/press/first-glimpse-at-redesign-of-classic-36m-heesen-yacht-opus-ii/): The first renderings of the 35.9-metre Heesen superyacht Opus II – now renamed Red Phoenix – have been revealed. The classic build is undergoing an 18-month refit at KRM Yacht, with Turkish studio Red Yacht Design leading the exterior and interior redesign.
- [Renderings of 35m Heesen yacht Opus II post-refit](https://krmyacht.com/press/renderings-of-35m-heesen-yacht-opus-ii-post-refit/): Late last year, the 35-metre Heesen motor yacht Opus II arrived at the KRM Yacht Refit & Rebuild facility for a refit, after which she will be named Red Phoenix. Red Yacht Design has released renderings of Red Phoenix’s redesigned exterior areas, providing a first look at how the vessel will appear once her transformation is complete.
- [What is Naval Architecture?](https://krmyacht.com/blog/what-is-naval-architecture/): The shimmer of a custom superyacht drifting off Cap Ferrat. The silent power of a hybrid explorer cruising the Antarctic Circle. The commanding presence of a 90-metre Feadship at anchor during the Monaco Yacht Show. These are spectacles of wealth, craftsmanship, and innovation. But behind each breathtaking vessel is a discipline as rigorous as it is creative, Naval Architecture.
- [What is a Marine Survey?](https://krmyacht.com/blog/what-is-a-marine-survey/): A marine survey is a professional inspection of a vessel carried out to assess condition, identify defects, and document findings for a specific purpose. On a yacht, that purpose may be purchase, insurance, class or statutory compliance, damage review, or refit planning.
- [What is a Yacht Management Company?](https://krmyacht.com/blog/what-is-a-yacht-management-company/): A yacht management company is a specialist shore team that keeps a vessel safe, compliant, crewed, maintained, insured, budgeted, and ready to sail. Think of it as the owner’s proxy and the captain’s support system. On modern yachts, the web of technical systems, regulations, and logistics grows quickly with size, passenger count, and range. Management brings the right expertise together so owners, captains, and crew can focus on the experience at sea.
- [What is a Superyacht?](https://krmyacht.com/blog/superyacht/): A superyacht is a large luxury yacht, usually understood as a yacht from around 24 metres upward, where professional crew, more complex onboard systems, and stricter operational requirements become normal.
- [KRM Yacht leads Turkish superyacht industry with key milestones](https://krmyacht.com/press/krm-yacht-leads-turkish-superyacht-industry-with-key-milestones/): KRM Yacht, a leading superyacht refit and rebuild facility based in Turkey, has reinforced its dominant position in the sector by securing three significant milestones. Founded in 2010 and based in Tuzla, Istanbul, KRM Yacht has completed over 200 projects with a skilled team of more than 100 professionals. Now, the company has added to its accolades by becoming the first Turkish refit facility to achieve triple ISO certification and gain membership in a prestigious global superyacht group.
## Pages
- [Facilities](https://krmyacht.com/facilities/)
- [Yacht Interior](https://krmyacht.com/services/superyacht-interior/)
- [Terms of Use](https://krmyacht.com/terms-of-use/)
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- [Yachting Glossary](https://krmyacht.com/glossary/)
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## Portfolio
- [M/Y ALMA](https://krmyacht.com/portfolio-item/my-alma/)
- [M/Y DEJA TOO](https://krmyacht.com/portfolio-item/m-y-dejatoo/)
- [M/Y ENIGMA](https://krmyacht.com/portfolio-item/m-y-enigma/)
- [M/Y PHILOSOPHY](https://krmyacht.com/portfolio-item/m-y-philosophy/)
- [M/Y HOPE & LOVE](https://krmyacht.com/portfolio-item/m-y-hope-love/)
- [M/Y OPUS II](https://krmyacht.com/portfolio-item/m-y-opus-ii/)
- [M/Y CLOUD ATLAS](https://krmyacht.com/portfolio-item/m-y-cloud-atlas/)
- [S/Y LADY M](https://krmyacht.com/portfolio-item/s-y-lady-m/)
- [M/Y SERENITY II](https://krmyacht.com/portfolio-item/m-y-serenity-ii/)
- [M/Y APRIL](https://krmyacht.com/portfolio-item/m-y-april/)
- [M/Y SEQUELP](https://krmyacht.com/portfolio-item/m-y-sequelp/)
- [M/Y AGA 6](https://krmyacht.com/portfolio-item/m-y-aga-6/)
- [M/Y LARA](https://krmyacht.com/portfolio-item/m-y-lara/)
- [M/Y LET IT BE M](https://krmyacht.com/portfolio-item/m-y-let-it-be-m/)
- [M/Y POLAR STAR](https://krmyacht.com/portfolio-item/m-y-polar-star/)
- [M/Y YANNINA](https://krmyacht.com/portfolio-item/m-y-yannina/)
- [M/Y ELEDA](https://krmyacht.com/portfolio-item/m-y-eleda/)
- [M/Y MY FALCON](https://krmyacht.com/portfolio-item/m-y-falcon/)
- [M/Y RUYA](https://krmyacht.com/portfolio-item/m-y-ruya/)
- [S/Y APHRODITTE A](https://krmyacht.com/portfolio-item/s-y-aphroditte-a/)
- [M/Y SANDS](https://krmyacht.com/portfolio-item/m-y-sands/)
- [M/Y MIAMI BLUES](https://krmyacht.com/portfolio-item/m-y-miami-blues/)
- [M/Y SANTA ANNA B](https://krmyacht.com/portfolio-item/m-y-santa-anna-b/)
- [M/Y RAHIL](https://krmyacht.com/portfolio-item/m-y-rahil/)
- [M/Y CHARADE](https://krmyacht.com/portfolio-item/m-y-charade/)
- [M/Y AERO](https://krmyacht.com/portfolio-item/m-y-aero/)
- [M/Y WILDCAT](https://krmyacht.com/portfolio-item/m-y-wildcat/)
- [M/Y JUST4US](https://krmyacht.com/portfolio-item/m-y-just4us/)
- [M/Y STERN](https://krmyacht.com/portfolio-item/m-y-stern/)
- [M/Y LIONESS](https://krmyacht.com/portfolio-item/m-y-lioness/)
- [M/Y COSTA MAGNA](https://krmyacht.com/portfolio-item/m-y-costa-magna/)
- [M/Y NEWAL](https://krmyacht.com/portfolio-item/my-newal/)
## Glossary Terms
- [Lockout/Tagout (LOTO)](https://krmyacht.com/glossary/lockout-tagout-loto/): Shipboard guidance treats LOTO as part of safe control of work rather than as a stand-alone label. IMO guidance on in-water cleaning says lock-out and tag-out procedures should follow the ship’s safety procedures and the service provider’s requirements, and that divers or dive supervisors should witness the locking and tagging of relevant equipment before entry into the water. OCIMF vessel inspection guidance sets out the wider isolation logic: agree the isolation method, discharge stored energy, use locks and tags at isolation points, test that isolation is effective, and monitor the isolation while the work remains active.
- [Permit to Work](https://krmyacht.com/glossary/permit-to-work/): OCIMF’s vessel inspection guidance describes a permit to work system as one that covers all areas of the vessel, addresses crew and contractor scopes, defines the work, identifies hazards, establishes controls, links related permits or simultaneous operations, requires authorization by responsible persons, communicates the controls to those involved, and ensures control over the return to normal operations. That framework matches how PTW is used on refit-heavy yachts with many concurrent jobs.
- [Docking Plan](https://krmyacht.com/glossary/docking-plan/): Class guidance describes the docking plan as the place to state the arrangement of docking blocks, the maximum permissible loading during docking, and the corresponding load at each block. The same guidance notes that the docking plan is recommended and does not require class approval as a condition of classification. That distinction matters on yachts: the plan is a technical basis for safe support, but the actual docking setup still has to reflect the yacht’s current condition, weight state, trim, appendages, and yard method.
- [Blackout Test](https://krmyacht.com/glossary/blackout-test/): DNV states that a proper blackout test involves both the main power system and the emergency generator start-up, because blackout recovery depends on those parallel processes working correctly without operational delay. On a yacht, that sequence may include automatic start of standby generation, recovery of essential switchboard sections, emergency lighting, alarms, automation, steering support, and orderly return of selected services once the system is stable.
- [Propeller Polishing](https://krmyacht.com/glossary/propeller-polishing/): IMO biofouling guidance states that regular polishing of uncoated propellers helps maintain operational efficiency and minimizes macrofouling accumulation. The same guidance treats propellers as niche areas that may require special cleaning equipment and procedures, and recommends that sea chests and similar areas be assessed when divers are already in the water for routine propeller polishing.
- [Sea Chest](https://krmyacht.com/glossary/sea-chest/): The term also carries a maintenance meaning because sea chests are classic trouble spots for fouling, blockage, corrosion, and coating breakdown. IMO biofouling guidance identifies sea chests as niche areas that are especially susceptible to biofouling, recommends that they be targeted during inspections, and notes that their design should allow inspection, cleaning, anti-fouling treatment, and, where fitted, growth-prevention measures. The same guidance recommends taking the opportunity during routine propeller polishing to assess sea chests for macrofouling.
- [Rudder Bearing](https://krmyacht.com/glossary/rudder-bearing/): Bearing condition shows up through clearance, alignment, wear pattern, noise, vibration, and steering feel. Excess clearance can let the rudder move beyond its intended running geometry, which may affect response, create knocking, increase seal wear, or overload related parts in the steering train. Class survey practice treats clearance as a meaningful indicator of condition. ClassNK's survey rules state that rudder bearing clearance is to be measured, and that the rudder may not need to be lifted or removed if the surveyor is satisfied by that measurement.
- [Steel Renewal](https://krmyacht.com/glossary/steel-renewal/): The decision to renew steel is normally driven by condition evidence: ultrasonic thickness readings, visual corrosion findings, cracking, deformation, impact damage, or repeated coating failure in critical areas. Classification practice ties thickness measurement closely to structural survey compliance, and condition records are used to support repair planning and the extent of renewal. DNV notes that thickness measurements support the planning of steel renewal, while LR describes thickness measurement as fundamental to structural periodical survey compliance.
- [Close-Out](https://krmyacht.com/glossary/close-out/): A technical close-out usually includes completed work records, test results, red-marked drawings, revised schematics, equipment settings, certificates, service reports, and confirmation that temporary protections or bypasses have been removed. On a larger superyacht refit, it also includes the handover logic for unfinished items: who owns them, what the deadline is, what evidence is still missing, and whether operation is allowed before final completion.
- [Approval Mapping](https://krmyacht.com/glossary/approval-mapping/): The value of approval mapping sits in sequence. Before materials are ordered or work fronts are opened, the project team can match each modification to the drawings, calculations, manuals, method statements, inspections, and tests it will require. A well-built map separates information-only submissions from approval-required submissions and shows which items need prior acceptance before fabrication, which can proceed under approved standards, and which need witnessing only after installation. It also gives shape to the engineering and design package by showing what documents must exist early enough to support procurement and yard execution.
- [Shaftline](https://krmyacht.com/glossary/shaftline/): A healthy shaftline depends on geometry as much as on hardware condition. Shaft straightness, coupling face accuracy, bearing fit, lubrication arrangement, seal condition, and engine-to-gearbox-to-shaft alignment all affect how the load moves aft. Any work on foundations, hull supports, brackets, stern tube areas, or nearby machinery can alter that alignment path. Much of the related service falls under wider mechanical drivetrain support and may also involve survey input when tolerances or classed components are concerned.
- [Class Approval](https://krmyacht.com/glossary/class-approval/): On refit projects, class approval is tied to the submitted basis of design and to the yacht as actually delivered. Drawings, calculations, material details, equipment data, and revised schematics need to line up with the installed condition. If the yard changes routing, scantlings, foundation details, cable protection, or equipment arrangement during execution, the submission set usually needs to be updated as well. That is one reason a disciplined technical drawing package remains central even when experienced trades and OEM technicians are involved.
- [Flag State](https://krmyacht.com/glossary/flag-state/): For owners, captains, and managers, flag state requirements shape the certificates the yacht must carry, the surveys it must complete, and the rules it must follow for manning, radio licensing, safety equipment, pollution prevention, and operational limitations. On commercial yachts and large private yachts, the flag state also sits behind the application of relevant IMO conventions, large yacht codes, and national implementing rules. Class and flag are connected but separate. Class checks compliance with class rules and, when authorized, may also carry out statutory surveys on behalf of the flag. Port state control is different again: it inspects a visiting yacht’s compliance when the vessel is in a foreign port.
- [Retrofit](https://krmyacht.com/glossary/retrofit/): The scope can range from a single-system upgrade to a major superyacht refit that affects multiple disciplines at once. A retrofit is shaped by the yacht that already exists: installed cable runs, tank locations, machinery space clearances, structural limits, fire zones, accommodation layout, and the vessel’s current class and flag status. A new component may fit on paper yet still require new foundations, revised ventilation, extra electrical load capacity, piping changes, software integration, or updated drawings before it can be installed properly.
- [Dynamic Positioning (DP)](https://krmyacht.com/glossary/dynamic-positioning/): DP matters because it improves control in sensitive operating areas, but it still has limits. Its performance depends on the vessel’s layout, available thrust, sensor quality, redundancy level, and operating conditions. It is also different from ordinary autopilot: autopilot follows a course, while dynamic positioning is designed to maintain position.
- [Net Tonnage (NT)](https://krmyacht.com/glossary/net-tonnage/): NT is commonly confused with gross tonnage, but the two figures answer different questions. Gross tonnage reflects total enclosed volume, while net tonnage is intended to represent the vessel’s usable capacity under the convention’s rules. For yacht discussions, NT is usually a paperwork and compliance term, not a shorthand for carrying ability or physical size.
- [Deadweight (DWT)](https://krmyacht.com/glossary/dwt/): On yachts, DWT matters most on larger expedition programs, shadow vessels, support craft, and conversion projects where load planning has a direct effect on endurance and handling. It is also relevant during loading studies and survey work, because the available carrying capacity influences trim, stability margin, and how the yacht behaves once tanks and stores are full.
- [Freeboard](https://krmyacht.com/glossary/freeboard/): The term matters in load assessment, seaworthiness, and design review because reduced freeboard usually means less margin before water reaches exposed deck areas. Yacht designers and engineering teams also look at freeboard in relation to hull form, stability, and operating profile, especially on vessels expected to carry large quantities of fuel, water, or equipment.
- [Air Draft](https://krmyacht.com/glossary/air-draft/): Air draft is different from draft, which measures depth below the waterline. A yacht may have relatively shallow underwater depth and still face serious clearance limits above the water because of tall superstructure elements or mast arrangements.
- [Draft](https://krmyacht.com/glossary/draft/): Draft governs whether a yacht can safely enter marinas, cross shallow channels, anchor close inshore, or approach certain yards and lifting facilities. Captains use it together with charts, tide data, and survey information when planning passages through areas with limited under-keel clearance.
- [Beam](https://krmyacht.com/glossary/beam/): Beam affects initial stability, internal volume, deck arrangement, and the practical limits for berthing, lifting, transport, and yard access. Naval architects and engineering teams also assess beam in relation to hull form, displacement, and the yacht’s intended operating profile, because width influences both usable space and behavior in the water.
- [LWL (Length at Waterline)](https://krmyacht.com/glossary/lwl/): Naval architects and engineering teams use LWL in performance calculations because it affects resistance, trim, and the speed-length relationship of the hull. As a general rule, a longer LWL supports more efficient passage through the water for a given hull form and displacement.
- [LOA (Length Overall)](https://krmyacht.com/glossary/loa/): LOA is used for berth allocation, yard access, transport planning, and vessel paperwork, and it commonly appears on drawings, certificates, and survey records. It is one of the first dimensions checked when a yacht is entering a marina, booking a lift, or being compared against size limits.
- [Shadow Vessel](https://krmyacht.com/glossary/shadow-vessel/): A shadow vessel often carries tenders, water toys, spare parts, extra fuel, provisions, dive gear, security staff, or even helicopter support arrangements. This lets the main yacht preserve guest space, reduce clutter on deck, and operate with more flexibility during longer voyages or remote cruising.
- [Chase Boat](https://krmyacht.com/glossary/chase-boat/): Typical tasks include guest transfers, crew runs, tow-sports support, dive drop-offs, filming, security observation, and carrying equipment needed away from the mothership. The term describes the boat’s role more than a single design type, so a chase boat may be a rigid inflatable, centre-console, or another high-performance tender. It sits below a shadow vessel in scale and endurance, but has a more active operational role than a basic tender used only for short trips.
- [Day Boat](https://krmyacht.com/glossary/day-boat/): The label covers several layouts, including open sport boats, walkarounds, and luxury day cruisers. Some day boats include a small cabin, head, or compact galley, but extended onboard living is usually secondary to day use. In the yacht market, the term is broad, so size, styling, and onboard features can vary significantly between builders.
- [Pocket Explorer](https://krmyacht.com/glossary/pocket-explorer/): These yachts usually emphasize fuel capacity, storage, tender handling, deck utility, and dependable machinery for extended passages or remote cruising. The appeal is that an owner can access the explorer-yacht style of use in a platform that is easier to crew, berth, and operate than a much larger vessel. The term overlaps with "explorer yacht," but size and scale are what change the feel of the concept. A pocket explorer typically keeps the rugged brief, range focus, and practical layout of the explorer genre while staying in a more manageable package for private ownership or lighter operational programs.
- [Long-Range Cruiser](https://krmyacht.com/glossary/long-range-cruiser/): In practical terms, long-range cruisers are shaped around tankage, storage, motion comfort, weather capability, and serviceable machinery systems. Some are full-displacement yachts built for efficient lower-speed passagemaking, while others use more advanced hull concepts to add speed without giving up the cruising brief. The label does not belong to one exact hull type or one fixed size range. What defines it is the operational profile: a yacht meant to stay self-sufficient for longer legs, carry meaningful stores and fuel, and support serious cruising plans beyond short coastal hops.
- [FDHF (Fast Displacement Hull Form)](https://krmyacht.com/glossary/fdhf/): For owners, the attraction is flexibility: the yacht can cruise economically at lower speeds yet still deliver higher-speed performance when required. Achieving that balance depends on hull geometry, displacement control, weight distribution, and engineering choices, so the result is very design-specific and cannot be judged by the acronym alone. FDHF is usually discussed alongside displacement, semi-displacement, and planing behavior because it sits between those familiar expectations. In practice, the term signals a yacht designed to preserve comfort and range-minded efficiency while still offering a faster top end than a traditional passagemaker.
- [Trawler Yacht](https://krmyacht.com/glossary/trawler-yacht/): Modern trawler yachts usually prioritize economy, tankage, onboard comfort, and straightforward machinery layouts. Many use full-displacement or semi-displacement hulls, depending on whether the design brief leans more toward traditional slow-speed efficiency or a faster cruising profile. The name can mislead people into thinking the yacht has a commercial role, but in yacht language it mainly describes a style and operating philosophy. A trawler yacht is best understood as a cruising platform built for comfort, endurance, and practical use over long periods aboard.
- [Flybridge Yacht](https://krmyacht.com/glossary/flybridge-yacht/)
- [Open Yacht](https://krmyacht.com/glossary/open-yacht/)
- [Sportfisher](https://krmyacht.com/glossary/sportfisher/)
- [Motor Sailor (MS)](https://krmyacht.com/glossary/motor-sailor-ms/)
- [Toy Garage](https://krmyacht.com/glossary/toy-garage/)
- [Jet Ski Dock](https://krmyacht.com/glossary/jet-ski-dock/)
- [Tender Lift](https://krmyacht.com/glossary/tender-lift/)
- [Wastage](https://krmyacht.com/glossary/wastage/)
- [Rudder Drop](https://krmyacht.com/glossary/rudder-drop/)
- [Bearing Clearance](https://krmyacht.com/glossary/bearing-clearance/): Clearance is one of the simplest measurements with the biggest mechanical consequences. Too little and the bearing may overheat, wipe, seize, or lose its intended oil film. Too much and the component can start to move in ways it was never meant to, creating vibration, edge loading, leakage, unstable alignment, or poor steering and shaft behavior. Class rules also use bearing-clearance measurement directly in survey work. For rudders, ClassNK rules and related unified requirements set minimum or standard clearance logic and treat clearance measurement as an accepted basis for judging condition.
- [Propeller Cavitation](https://krmyacht.com/glossary/propeller-cavitation/)
- [Harmonics](https://krmyacht.com/glossary/harmonics/)
- [Load Study](https://krmyacht.com/glossary/load-study/)
- [Liquidated Damages](https://krmyacht.com/glossary/liquidated-damages/)
- [Snagging](https://krmyacht.com/glossary/snagging/)
- [Spot Repair](https://krmyacht.com/glossary/spot-repair/)
- [Feather Edge](https://krmyacht.com/glossary/feather-edge/)
- [Pinholes](https://krmyacht.com/glossary/pinholes/)
- [Runs / Sags](https://krmyacht.com/glossary/runs-sags/)
- [Orange Peel](https://krmyacht.com/glossary/orange-peel/)