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Yacht Classifications

• By Dudley Dawson
• Updated: July 17, 2009

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Let’s take a peek into the dark back corner of a London pub a couple hundred years ago, when Britain was the unquestioned ruler of the sea, as a group of Lloyd’s of London insurance underwriters licked their financial wounds from the latest loss of a cargo ship to Davy Jones’s locker. They’d had enough, and proposed to form an independent society to make ships safer by developing standards for construction, operation, and maintenance. Thus was born Lloyd’s Register of Shipping, no longer affiliated with Lloyd’s of London, but still the granddaddy of maritime classification societies.

The concept was so successful in improving safety and cutting losses that spinoffs and imitators soon appeared in other seagoing nations. There are now ten full members and one associate member of the International Association of Classification Societies ( www.iacs.org.uk ). Not all of them class yachts, and of those who do, not all class smaller yachts. The American Bureau of Shipping (ABS), for instance, does not class yachts under 24 meters, or about 79 feet, in overall length.

Each society also has different sets of rules and guides, several of which will be applicable to any given yacht. While national codes, such as the U.S. Coast Guard regulations, and international treaties, such as SOLAS, are mandatory, classification is in most cases voluntary. A shipowner or yachtowner elects to have his vessel classed in order to better assure a certain level of sound design and construction, and consequently, to reduce insurance premiums and losses.

Although there are differences in the details, the societies have much in common. Each issues written rulebooks and guides for use by designers, reviews and approves the vessel plans in advance of construction, and employs dedicated surveyors to assure that the vessel is built in accordance with the plans. There are also periodic inspections by this same corps of surveyors throughout the vessel’s service life to check that it is being maintained to the required standards.

The voluntary nature of classification creates a number of possibilities for a yacht owner. He can pick and choose from the several classification societies that cater to yachts. For instance, an American owner having a fast yacht built in Holland could choose to have it classed by the Norwegian society, DNV (Det Norske Veritas). This is where those detail differences come in, as some designers consider the DNV construction rules for high-speed vessels to be more realistic than those drafted by some other societies. Such shopping for classification is commonplace, and that’s why you’ll find surveyors for each society in each shipbuilding nation. In an Italian yard, for instance, you might find an ABS surveyor working on one vessel and a Lloyd’s inspector working on another, alongside the first. In some cases, where the surveyors are independent, or “non-exclusive” in society parlance, you might find him wearing a DNV jumpsuit one day and ABS coveralls the next.

In addition to choosing his classification society, an owner can choose the level of involvement he wants with classification. Full classification means plan approval before construction, inspection and approval of both construction and installed equipment (anchors, engines, generators, etc.), and periodic inspections and required maintenance after delivery. An owner can also add various options, including most recently, an environmentally based endorsement of the yacht as “green.”

All of this comes at a price, of course, both in meeting the initial requirements and in continuing costs. Some owners view any financial outlay as justified in protecting their vessel and those aboard; others elect to have the yacht designed and built to class, and then drop the class designation when fees and mandated maintenance expenses begin to exceed the savings in insurance premiums.

Finally, an owner can opt to have his designer and builder use the written classification standards as a guide in the construction of his new vessel, without actually contracting with the society. This avoids some of the expenses of questionable value, such as factory testing and equipment certification. Then an independent non-society surveyor or project manager can oversee the construction up to delivery, and the captain, vessel management firm, or favorite boatyard can track maintenance requirements. It’s not official, but it’s still classy.

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Class Notations on Yachts – Classification Guide

9 December 2016

INTRODUCTION TO YACHTS CLASSES

Classification.

Rules are developed to establish standards for the structural strength of the large yacht’s hull and its appendages, and the suitability of the propulsion and steering systems, power generation and those other features and auxiliary systems which have been built into the ship to assist in its operation, and even pollution protection systems. A yacht may be maintained in class provided that, in the opinion of the Society concerned, it remains in compliance with the relevant Rules, as ascertained by a periodic or non-periodic survey(s). Today a vessel either meets the relevant Class Society’s Rules or it does not. As a consequence, it is either “in” or “out” of “Class”.

In summary, Class Notations on Yachts will tell you a lot about the building quality and condition of each vessel and its components on an annual basis, according to the excellence of its construction and its adjudged continuing soundness. A yacht that has been designed and built to the appropriate Rules of a Society may apply for a Certificate of Class from that Society or for a periodical survey (generally required every 5 years) meant for the Renewal of Class Certificate . Class Societies have often developed two separate sets of Rules for Commercial and Private Yachts . They can be applied to New Construction as well as Existing Yachts .

Classification Societies

Classification Societies play a fundamental role in today’s marine industry. A Society will act on behalf of ship-owners and builders to ensure high build quality and the safety of a ship’s main structural parts . Classification also provides a point of reference with regard to those who were involved in the supply chain including builders, charterers and insurers.

As an independent, self-regulating, externally audited, body, a Classification Society has no commercial interests related to ship design, shipbuilding, ship ownership, ship operation, ship management, ship maintenance or repairs, insurance, or chartering.

The process begins with the design and construction phases, focussing on the implementation and manufacture of key components as well as technical specifications. The standards which must be adhered to are dictated by the regulations of the chosen society and are published as rules, evolving continuously to incorporate new technologies and client requests via the advice of highly competent engineers and architects.

All Classification Societies waive liability for future faults as a surveyor can only record a vessel’s quality at the time of inspection; it is then the responsibility of the yacht owner to maintain the vessel and inform the society in the event of damage or structural alteration. Although the surveys are thorough, they do not cover all aspects of a ship’s build and operating service. This can include crew qualifications, navigational aids and manoeuvrability.

Classification Societies are often simply referred to as “Class Societies” or just “Class”. There are currently 13 members of the International Association of Classification Societies (IACS) , each with a unique set of rules, classification layouts and notations. Five of the biggest Classification Societies are listed below, along with their identifying signature, to denote a ship constructed under special survey in compliance with the Society’s rules, suitable for unrestricted sea-going service:

The marks following the Society’s standard signature are not interchangeable between organizations, meaning each letter or number will represent a different characteristic for each society. Each mark can be broken down to highlight a yacht’s capabilities, equipment or restrictions.

Each of the Classification Societies has developed a series of notations that may be granted to a vessel to indicate that it is in compliance with some additional voluntary criteria that may be either specific to that vessel type or that are in excess of the standard classification requirements.

The Classification of a yacht does not absolve the Interested Party from compliance with any requirements issued by Administrations and any other applicable international and national regulations for the safety of life at sea and protection of the marine environment such as SOLAS, ILLC, MARPOL, ILO or IMO.

Smaller vessels are categorized differently, adhering to different requirements and statutory regulations. With a heavier focus on passenger numbers and distance of operation from shore, the Maritime and Coastguard Agency (MCA) outlines guidance for UK vessels (up to 24 meters in length) which are used for charter or commercial use.

As RINA is today the most reputed Classification Society in the Mediterranean and a leader in the yachting certification business, developing and offering services of ships classification, certification, verification of conformity, inspection, and testing, we will hereby provide you with a summary of their more common Class Notations on Yachts , this will be helpful to identify these most peculiar symbols :

CLASS NOTATIONS – RINA

Main class symbol.

The main class symbol C is assigned to ships built in accordance with the requirements of the Rules or other rules recognized as equivalent and maintained in a condition considered satisfactory by the Society. The period of class (or interval between class renewal surveys) assigned to a ship is a maximum of 5 years.

Except for special cases, a class is assigned to a ship only when the hull, propulsion and auxiliary machinery installations, and equipment providing essential services have all been reviewed in relation to the requirements of RINA’s Rules.

With the 5 year class period is to be understood as being the highest class granted by the Society.

Construction Marks

The construction mark identifies the procedure under which the yacht and its main equipment or arrangements have been surveyed for the initial assignment of the Class.

Construction marks defined below are assigned separately to the hull of the yacht and its appendages, to the machinery installation.

The construction mark is placed before the symbol HULL for the hull, before the symbol MACH for the machinery installations, and before the additional Class Notation granted, when such a notation is eligible for a construction mark.

When the same construction mark is assigned to both hull and machinery, the construction mark is assigned globally to the ship without indication HULL and MACH after the main class symbol.

Hull Construction Mark (HULL)

• Construction mark ✠ is assigned to the hull when it has been surveyed by RINA during its construction in compliance with the new building procedure.
• Construction mark ✠ is assigned to the hull when it was built under the survey of another Society.
• Construction mark ● is assigned to the hull in all cases other than those listed above.

Machinery Construction Mark (MACH)

• The construction mark ✠ is assigned when the propelling and auxiliary machinery has been designed, constructed, certified, installed and tested in accordance with RINA Rules.
• The construction mark ✠ is assigned when the propelling and auxiliary machinery has been designed, constructed and certified in accordance with the rules of another society and installed and tested under the survey of RINA.
• Construction mark ● is assigned in all cases other than those listed above.

Navigation and Operating Notations

The navigation notation UNRESTRICTED NAVIGATION is assigned to a ship intended to operate in any area and any period of the year.

Restricted operating area notations are optional and will be marked accordingly like, for example, on a specified operating area or operation service within “x” miles from shore.

Additional Class Notations

An additional Class Notation expresses the classification of additional equipment or specific arrangement, which has been requested by the Interested Party. The assignment of such an additional Class Notation is subject to the compliance with additional rule requirements.

Some additional Class Notations, due to the importance of relevant equipment or arrangements, are assigned a construction mark. This is indicated in the definition of the relevant additional Class Notations. Class Notations which may be assigned to a ship are listed according to the category to which they belong:

Automated Machinery Systems (AUT)

AUT notations are relevant to automated machinery systems installed onboard ships.

Automated machinery systems (AUT – UMS (Y))

The additional Class Notation AUT-UMS (Y) may be assigned to yachts that are fitted with automated installations enabling machinery spaces to remain periodically unattended in all sailing conditions including manoeuvring.

Integrated Ship Systems (SYS)

SYS notations are relevant to the operation of integrated systems regarding navigation, machinery, communication and specific cargo, as applicable.

Centralised Navigation Equipment (SYS-NEQ)

The additional Class Notation SYS-NEQ is assigned to yachts which are fitted with a centralized navigation control system so laid out and arranged that it enables normal navigation and manoeuvring operation of the ship by two persons in cooperation.

Centralised Navigation Equipment (SYS-NEQ-1)

The additional Class Notation SYS-NEQ-1 is assigned when, in addition to the above, the installation is so arranged that the navigation and manoeuvring of the yacht can be operated under normal conditions by one person, for a periodical one-man watch. This notation includes specific requirements for the prevention of accidents caused by the operator’s unfitness.

Integrated Bridge System (SYS-IBS)

The additional Class Notation SYS-IBS is assigned to yachts which are fitted with an integrated bridge system which allows simplified and centralized bridge operation of all main functions of navigation manoeuvring and communication, as well as monitoring from the bridge of other functions related to specific cargoes and pollution; for passenger ships, heating, ventilation and air conditioning are also included in the monitored functions

Communication System (SYS-COM)

The additional Class Notation SYS-COM is assigned to yachts which are fitted with a local area network including the alarm, monitoring and control systems and computers used for management operations and external communication devices for reporting ashore navigation, maintenance and operational information.

Damage Stability (DMS)

The additional Class Notation DMS may be assigned to yachts complying with the damage stability requirements.

STAR Notation

General STAR is a System of Trace and Analysis of Records integrating rational analysis with data and records from ship-in-service concerning planned inspection and ship maintenance.

The additional Class Notation STAR-HULL is assigned to ships on which an Inspection and Maintenance Plan (IMP) for the hull is implemented.

The notation may be completed by the suffix NB when a structural tridimensional analysis has been performed for the hull structures, at the new building stage. The suffix NB is removed when the ship enters the STAR-HULL survey program through the implementation of the Inspection and Maintenance Plan (IMP).

The additional Class Notation STAR-MACH is assigned to yachts on which an Inspection and Maintenance Plan (IMP) for the machinery is implemented. This plan is based on a risk analysis review of the installation.

STAR Notation (STAR)

When yachts are granted both STAR-HULL and STAR-MACH, the two separate notations are superseded by the cumulative additional Class Notation STAR.

Crew Accommodation and Recreational Facilities (MLCDESIGN)

According to the Maritime Labour Convention 2006 Notation:

The additional Class Notation MLCDESIGN is assigned to yachts having crew accommodation and recreational facilities complying with the Maritime Labour Convention 2006 (MLC).

GREEN PLUS Notation (Eco-Friendly Yachts)

Issued in 2008 and updated yearly, the GREEN PLUS additional Class Notation has been revised in 2012 to cover new issues for seagoing ships and ships operated at a fixed location. The additional Class Notation GREEN PLUS is assigned to Eco-Friendly yachts compliant with the Society’s environmental protection framework of airborne gases, spillage/leakage of substances, oil, sewage, greywater, garbage disposal and noise mitigation systems to prevent pollution.

Safety Class Notation EFP (Bureau Veritas)

The following additional Class Notations are assigned to yachts complying with the requirements of this Section:

• EFP-A : for yachts having Enhanced Fire Safety Protection in accommodation spaces,
• EFP-M : for yachts having Enhanced Fire Safety Protection in machinery spaces,
• EFP-C : for yachts having Enhanced Fire Safety Protection in cargo areas,
• EFP-AMC : for yachts complying with all the requirements of this Section.

For more information on Class Notations on Yachts – Classification of Yachts , please feel free to contact Allied Yachting .

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The American Bureau of Shipping (ABS) is a classification society, with a mission to promote the security of life, property and the natural environment, primarily through the development and verification of standards for the design, construction and operational maintenance of marine-related facilities. At the end of 2012, ABS was the second largest class society with a classed fleet of nearly 12,000 commercial vessels and offshore facilities. ABS’ core service is the provision of classification services through the development of standards called ABS Rules. These Rules form the basis for assessing the design and construction of new vessels and the integrity of existing vessels and marine structures.

History ABS was first chartered in the state of New York in 1862, to certify ship captains. It has been involved in the development and improvement of safety standards. Born out of a need for industry self-regulation, ABS published its first technical standards, Rules for Survey and Classing Wooden Vessels, in 1870. When the era of wooden ships gave way to iron, ABS established standards for these structures, published as Rules for Survey and Classing of Iron Vessels. Similarly, when iron gave way to steel, ABS Rules for Building and Classing Steel Vessels were established and published in 1890. These Steel Vessel Rules continue to be revised and published annually.

Organization and management ABS has been organized as a not-for-profit since its founding in 1862. ABS has been commissioned by the US government and the US Coast Guard to act in many maritime matters and has hired several former officers from the Coast Guard. ABS is required under US law to maintain its status as a not-for-profit organization in order to maintain its role as the agent of the US government on matters of government vessel classification An article published by Bloomberg in November 2012 pointed out that the American Bureau of Shipping doesn’t pay taxes as a non-profit, though it’s one of the nation’s most profitable non-profits. It criticized the organization for “lavish” expenses such as first-class flights, health and social club dues and other services.

The world headquarters as well as the ABS Americas Division headquarters for ABS are located in Houston, Texas, USA. The divisional headquarters for Europe is located in London and the divisional headquarters for Asia Pacific is located in Singapore. ABS has more than 5,500 employees worldwide and is broadly divided into 2 groups: Engineering review and Surveying. ABS Engineers work in office buildings in Houston, Hong Kong, Singapore, London, Shanghai, Busan, Yokohama and other cities. Surveyors are employed in ports and shipyards worldwide to verify that ships are built according to the drawings.

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Classification The responsibility of the classification society is to verify that merchant ships and marine structures presented to it comply with Rules that the society has established for design, construction and periodic survey. Classification itself does not judge the economic viability of a vessel. Neither is the society in a position to judge whether a vessel is ultimately employed according to the stated intended purpose for which it was classed. The classification society records, reports and recommends in accordance with what it has seen at the time of a vessel’s construction and subsequent surveys. If a vessel is found not to comply with the Rules, and the recommendations of ABS are not followed, then the society will suspend or cancel classification. Rules are derived from principles of naval architecture, marine engineering and associated disciplines. A new Rule, or a proposed change to an existing Rule, originates with one of the ABS technical committees, from in-service experience, from a new IACS Unified Requirement or from the ongoing research conducted by the technology staff at ABS. Research projects are conducted either directly by ABS or are undertaken jointly with industry, with academic and governmental organizations or with other appropriate partners to best draw on the most qualified sources available.

When an owner first requests that a vessel or structure be classed, the shipyard or design agent presents drawings and calculations to ABS for a systematic detailed review for compliance with the Rules. ABS engineers review the plans to verify that the structural and mechanical details conform to the Rule requirements.

After a design has been approved by ABS engineers, ABS field surveyors attend the vessel at the shipyard from keel laying to delivery.The surveyors verify that the approved plans are followed and the Rules are adhered to. During the construction of a vessel built to ABS class, surveyors witness, at the place of manufacture or fabrication, the tests of materials for the hull and certain items of machinery as required by the Rules. They also survey the building, installation and testing of the structural and principal mechanical and electrical systems.

When completed, a vessel undergoes sea trials attended by an ABS field surveyor. The vessel is then presented to the ABS Classification Committee which assesses the vessel’s compliance with the Rules based on the collective experience of the Committee members and recommendations from the ABS staff. The Classification Committee is composed of ABS Members drawn from the maritime industry, United States Coast Guard and ABS officers. When accepted by the Committee, formal certification is issued to the vessel. The vessel’s classification information, characteristics and other particulars are then entered into the ABS Record – the electronic register of vessels classed by ABS maintained and updated on the ABS web site.

ABS Rules require that every classed vessel be subject to periodic surveys to determine whether it is maintained in accordance with classification standards. Surveys are based on a five-year cycle of Annual Surveys, an Intermediate Survey to be completed between the second and third years of the five-year period, and a comprehensive Special Survey including dry docking at each fifth anniversary from the time of the vessel’s delivery.

Certification ABS also offers certification to specified standards. Whereas classification requires periodic surveys of the classed vessel or offshore unit throughout its life, certification verifies that the item conforms to designated standards at a specified time. Certification can establish compliance with ABS, national, international, industry or other standards.

Offshore & Energy Services ABS also develops standards for the design, construction and operational maintenance of offshore drilling and production units and for gas carriers of all types. These standards cover mobile offshore drilling units (such as jackup rigs, semisubmersible rigs, and drill ships), floating offshore production installations (spars, tension leg platforms, semisubmersibles and FPSOs/FSOs), fixed offshore installations, pipelines, risers, and single point moorings.

Statutory Services ABS also acts as a Recognized Organization on behalf of more than 100 governments. A Recognized Organization is authorized by a flag State to conduct plan review and statutory surveys on ships registered under that flag on behalf of the nation’s maritime administration. Typical regulations include the U.S. Code of Federal Regulations (CFR), SOLAS , MARPOL regulations, and the Load Line Convention. In addition to the national or international tonnage certificates, Panama and Suez Canal tonnage certificates can be issued by ABS on behalf of those authorities.

Naval Vessel Standards The ABS Rules for Building and Classing Naval Vessels are developed for naval vessels. The standards address the bulk of hull, mechanical, electrical, environmental and safety related criteria for the vessels.

The Naval Vessel Rules have restricted distribution, unlike the other ABS Rules and Guides which are available for download or hardcopy purchase.

Rapid Response Damage Assessment (RRDA) Program Decisions made within the first few hours following a maritime casualty can determine the outcome, i.e. whether or not the vessel will remain intact and the potential environmental impact. The RRDA program provides an organized team of engineers and naval architects during emergency situations.

Since 1993, RRDA engineers have contracted HECSALV software to model more than 2,000 vessels including floating production, storage and offloading (FPSO) units, tankers, bulk carriers, gas carriers, semisubmersibles and spars classed by the major classification societies. Teams have responded to more than 180 worldwide incidents ranging from tank explosions, groundings, collisions and fires to minor structural damage, flooding, trimming to replace stern seals, emergency drydockings and structural evaluation with missing structure in repair situations.

The principal role of the RRDA team is to assist the Master and owner’s technical personnel. With the ability to quickly calculate the effect of damage to hull structure and free-flooding of internal spaces, we help the owner/operator minimize further stressing of the hull, loss of the vessel due to inadequate stability or spilling harmful fuel and cargo into the environment. The RRDA team can also interface with the vessel’s class society and flag or port State officials to provide technical documentation to support proposed temporary repairs, operations, single voyage requests or other related requirements.

ABS Academy ABS Academy, a specialized division of ABS provides marine courses & seminars on classification, regulation, engineering design, new construction, risk management, quality, and environmental awareness to world’s leading shipowners and shipbuilders. The programs include: Shipbuilders Courses Offshore Courses Shipowners Courses ILO Maritime Labor Convention & Regulatory Update Challenges in Arctic Marine & Offshore Operations and more.

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The MAIN TOPICS follow a natural progression from conception of the vessel thru its building, marketing, survey, financing, insuring, transport, moorage, use and upkeep. The MAIN TOPICS (all Caps) below are followed by their Main Subtopics with Links.

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• Published over 50,000 website pages about boats and boating, bringing us closer to reaching  our goal of becoming "The ultimate reference resource about boats and ships for everyone from the beginning recreational boater to the seasoned professional mariner!"
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• Acquired over 1,200 books and magazine back issues in our academy library and so far have made over 700 viewable to Academy Members through our EAB website eLibrary .
• Published over 500 DIY How-To articles about boat design, construction, inspection, operation, maintenance, troubleshooting and repair. We are working hard to do more.

We are currently formatting and polishing the Anchors Aweigh Academy online and hands-on courses. Our Marine Surveying  course has proven to be excellent for both the beginner and the seasoned surveyor, and especially helpful to the Do-It-Yourselfer.

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FROM Donald:  " This is an awesome website. I found the information that I needed right away from one of the over 20,000 free articles that you provide as a public service. I'm surprised that so much if this site is free. But I still signed up so I could access the thousands of expanded pages, interesting articles, and dozens of valuable programs! The member's library of books, magazines and videos that I can view online is really terrific! I understand that you and your staff are all unpaid volunteers. Please keep up the good work. And I commend you for your plans to add another 10,000 free informative articles over the next year. I'm thrilled to support you in this endeavor with my small membership donation. Thanks again for all your hard work. "

FROM Huey:  " I agree with my Uncle, I too have found the articles to be very enlightening. They say that it will take about 100,000 articles to cover the full scope that they have envisioned for the website. They have over 20,000 articles so far and that's doing pretty well, but it could take several years to get the rest. I also noticed that many of the Main Topic Pages and some of the article pages are still in the rough draft stage. I guess that they will fill in as they can get volunteers to work on them. But what I can't figure out is why anyone would spend the time writing informative in depth articles just to give away free to this website for publication? What's in it for them? "

FROM Dewey:  " Well Huey, to me It looks like most of the articles on this website are written by very informed people, like boating instructors, boat designers, boat builders, riggers, electricians, fitters, marine repair technicians and marine surveyors. Writing such articles helps establish them as knowledgeable professionals. After all, this website was originally created by a school for marine technicians and marine surveyors. The website is growing in content every day. They even had to move to a bigger, more powerful server because the website's traffic has been growing exponentially. "

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FROM Scrooge: " You rave about this website like it was the best thing since sliced bread. Well, I think it stinks. Sure, it has a lot of good information for boaters, and they're adding more every day, but it will probably never be finished. Furthermore, I don't even own a boat. And I wouldn't have a boat even if someone gave me one. Boats are a waste of money and time and energy and money! They're just a hole in the water you pour money into. If you gave me a boat, I'd sell it quicker then you could say Baggywrinkle. Then I'd lock up the cash with all my other money so I could keep my eye on it and count it every day. Bah humbug. "

FROM Daisy:  " I'm just so glad that Donald got the boat so we and the boys could enjoy boating — together. And of course all of the girls, April, May, and June, love to be on the water too, especially when that is where the boys are. Oh poor Scrooge, boating is more fun then you could possibly imagine. "

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Demystifying yacht classification A, B, C, D

N.B. For your information, a more recent article was published on 24 Oct 2022 on the same subject, click here for direct access.

Demystifying yacht classification :  Class A, B, C and D

Since 1998, CE certification is required for all recreational boats entering or being sold in Europe obliging boat manufacturers to respect certain building and security standards.  Therefore, yachts ( boats ) are classified into four categories depending on their aptitude to confront navigational conditions taking into account both force of the wind and height of the waves.  The categories are not to limit the area and distance of navigation (that is defined by security equipement onboard) but  to  sensitize the owner and/or captain of the boats capacities to navigate in complete security.

Let us start with the Beaufort Scale.   A scale for classifying the force of the wind ranging from 0 (calm) to 12 (hurricane).   It was devised by an admiral in the British Navy, Francis Beaufort, to uniform the description of the effect of different winds at sea.

There is a direct link between the Beaufort scale and boat classification.   For discussion purposes, we will use only the 6, 7 and 8 forces.

A Class A yacht ( boat ) is a vessel that is built to navigate the open ocean and surpass a force 8 on the Beaufort scale and surpass waves higher that 4 meters.   These yachts are constructed to be self sufficient in hostile seas.

A Class B yacht ( boat ) is a vessel built to navigate on the offshore waters (200 miles and less) and can substain UP TO force 8 and waves UP TO 4 meters.

A Class C boat is a vessel built to navigate inshore such as lakes, rivers, bays and close to the shore and can sustain UP TO force 6 and waves UP TO 2 meters.

A Class D boat is built for protected or sheltered waters such as canals, rivers, small lakes and sustain a force 4 and waves UP TO .3 meters (less that 1 ft).

With this said, you can understand that the Class A yacht ( boat ) respects a rigorous building code more so than a Class B and so forth.    But regardless of the class, it is strongly discouraged to navigate in a force 7 for the reasons of safety and comfort as « pleasure » should always be on the agenda.  Always consult the weather forecast prior to leaving any port and check hourly the weather situation.

Classification is very important and should be on your question list before purchasing any boat or yacht.

Classification rules are developed to assess the structural strength and integrity of the essential parts of the hull, the reliability and function of the propulsion, steering systems, power generation and all the other features installed on board which contribute to guarantee the main essential services of yacht.

Also for a class A, the portholes will be more resistant against a sustained wave, the drains to evacuate the water more abundant and of good size, the joints of the hull more hermetic, in short everything is in place to prevent water from s’ infiltrate on board.

By way of information, let us quote for example all the Ferretti yachts (60 to 96 feet), Pershing (60 to 115), the Riva (44 to 122) are all of class A just like the Magellano range at Azimut including also the 66 Flybridge.

Ferretti yachts (500, 550, 670 fly and over), Pershing (7X and over), Azimut Yachts (62, 64, 66, 68 Fly and over, the Sport Series 7X and over, all Magellano) are Class A.  There are also other classifications such as RINA and American Bureau of Shipping, Bureau Veritas, Det Norske Veritas, Germanischer Lloyd, Lloyd Register, that are more precise regulations and we will cover this later in another article.

Below is the graph of the Beaufort Scale along with photos.

Do not hesitate to contact us for any additional information, team Ita Yachts Canada is at your disposal.

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Understanding Yacht Classifications – Definitions, Explanations, and Regulations

Yacht classifications, also known as classification societies or class societies , are an important part of maritime safety. These classifications dictate the design, construction and ongoing maintenance of large commercial vessels and yachts.

The classifications provide highly detailed and technical standards that cover the yacht’s hull, its engines, and key safety systems.  The application of common safety requirements to personal vessels like yachts is something relatively new, so the procedures are constantly evolving. Typically, it is dependant on the service and the flag of the yacht.

Standard Yacht Types

Before discussing the different types of yacht classifications, it’s important to understand the different yacht types. Yachts are typically segmented based on the overall length and how many passengers they can accommodate. The standard yacht classification types are large yachts or luxury sailing yachts, commercial yachts, and private yachts.

Large Yachts

Large yachts, also known as luxury yachts, is the largest classification type for yachts. A large yacht has a load line length equal to or over 24m or about 80 feet. Just about every flag administrations have adopted safety codes for large yachts. Therefore, this is the only yacht definition having a universal meaning in the international regulatory framework of yachts.

Commercial Yachts

Commercial yachts are ones that are used for commercial use, whether it be sport or charter. These ships do not transport or carry any cargo and carry no more than 12 passengers.

All flag states require that commercial yachts are certified in accordance with a specific large yacht safety code. The most widely used safety code is the MCA Large Commercial Yacht Code (LY2) published in 2004.

Private Yachts

Private yachts are typical pleasure vessels used for the recreational and leisure purpose of its owner and his guests.  In some cases, they are also known as cruising yachts.

What Is A Classification Society?

Classification societies are organizations that set the rules that govern the construction, maintenance, and operation of yachts and vessels. Currently, there are 13 members of the International Association of Classification Societies . Classification societies were first started when insurance underwriters at Lloyd’s of London set standards for the ships that they would ensure.

As a result, Lloyd’s Register of Shipping (LR) was the original classification society. While many of the 13 members do not classify yachts, they cover everything from container ships to supertankers.

The main class societies involved in yachting are the American Bureau of Shipping, Bureau Veritas, Det Norske Veritas, Germanischer Lloyd, Lloyd’s Register, and RINA.

What Is A Flag State?

A vessel’s flag state is the jurisdiction or nationality under whose laws the vessel is registered or licensed. The flag state has the authority and responsibility to create regulations for vessels registered under its flag. These typically involve those relating to the inspection, certification, and issuance of safety and pollution prevention documents for a vessel.

Different flag administrations may perform inspections on the safety aspects of yachts using their own inspectors or use classification societies or other recognized organizations to perform these inspections.

The main flag authorities in the yachting industry are the UK-MCA, Cayman Islands, Isle of Man, Malta, the Marshall Islands, Italy, and Luxembourg.

What Is The Classification Process

The first step of classification involves the assessment of a yacht’s designs and regular inspections during the construction or conversion of a yacht. Once it is confirmed that all standards have been met, a certificate of classification is issued.

The certificate details the standards met, the intended use for the vessel, and whether the vessel should be used only in sheltered waters. The certificate is evidence that a yacht meets industry standards but isn’t necessarily a guarantee of seaworthiness.

Maintaining classification is achieved through regular surveys. These surveys, also known as ‘special’ surveys, typically take place every five years. These surveys assess things like the thickness of the hull, possible fractures, and other potential damage. They also consider the condition of electrical systems, machinery, and equipment.

Mandatory Classification Certificates

There are a variety of different classification certificates. The number and type of the mandatory certificates for a given ship will depend on its size.

International Tonnage Certificate This expresses the internal volumes of the yacht in gross tons. Unlike displacement tonnage, this does not quantify the weight of a vessel.

Large Yacht Code Certificate This certificate covers navigational and signaling equipment, life-saving appliances, fire protection, means of escape, and manning and crew accommodation.

Class Certificate This mainly deals with the yacht’s hull, machinery, electrical equipment, and outfitting.

International Load Line Certificate This certificate covers the weather-tightness of the yacht.

Safety Radio Certificate This certificate only applies if gross tonnage exceeds 300GT. It covers radio communication and distress installations.

MARPOL Annex I Certificate This certificate only applies if gross tonnage exceeds 400GT and covers the disposal of oil and bilge water.

MARPOL Annex IV Certificate This certificate only applies if gross tonnage exceeds 400GT or the yacht is certified to carry more than 15 people and covers the disposal of sewage from ships.

MARPOL Annex V This certificate covers the disposal of rubbish and applies to all ships.

MARPOL Annex VI  This is applicable if gross tonnage exceeds 400GT as well as to all main and auxiliary engines with a power exceeding 130kW. It concerns the emissions from main and auxiliary engines (NOx and SOx).

Safety Construction and Safety Equipment These cover machinery, electrical parts, life-saving and navigational equipment for yachts with a gross tonnage above 500GT.

International Safety Management Certificate This only applies to yachts with a gross tonnage greater than 500GT. A certified management company is requested to carry out this service, preparing operational manuals, procedures for drills, and taking care of the maintenance of the yacht and its installations.

International Ship and Port Security Certificate This only applies to yachts and ships with a gross tonnage greater than 500GT and covers the anti-piracy certification. A certified management company is requested to provide ashore assistance and establish onboard procedures and operational manuals.

Keeping Your Yacht Up To Classification

Tess Electrical has years of experience in maintaining yachts and commercial vessels. We deal with vessels 125’ and above, which have more complex systems dictated by Classification, Flag State and Insurance requirements. Even if vessels are not classed, we can still maintain them to those standards.

Give us a call or send us an email to speak with one of our experienced marine engineers about developing a maintenance strategy for your yacht today.

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Rules for Building and Classing Marine Vessels (MVR)

The consolidation of the rules vary by each part as follows:

Part 1 – Conditions of Classification

The ABS Rules for Conditions of Classification was formerly composed of a “generic” Part 1 booklet that applied to many Rules and Guides, plus Supplement Part 1 booklets in each Rule or Guide that contain the specific requirements for classification of the specific vessel type. All of the Part 1 booklets have been combined into a single Part 1 with each of the Supplements becoming a Chapter.

Part 2 – Materials and Welding

Formerly the Materials and Welding requirements were presented in three volumes:

• Chapters 1‐4, which deal with steel construction,
• Chapters 5‐6, which deal with Aluminum and Fiber Reinforced Plastics respectively and
• Supplementary Requirements for Naval Vessels. Because the Supplementary Requirements for Naval Vessels are applicable only to High Speed Naval Craft, they are being left as a stand‐alone volume.

Chapters 1‐4 and Chapters 5‐6 have been combined into a single volume used by both the Marine and Offshore consolidated Rules.

Part 3 – Hull Construction

The SVR, U90M and OSV Rule hull construction requirements have been consolidated into a single Part. Unlike the largely editorial revisions to the Generic Rules (Parts 1, 2 & 7), this Part has substantial organizational revisions.

Part 4 – Vessel Systems and Machinery

As for Part 3 the System and Machinery requirements of the SVR, U90M and OSV Rules have been consolidated into a single Part. This Part has substantial organizational revisions.

Part 5A&5B – IACS Common Structural Rules for Bulk Carriers and Oil Tankers

These Rule Parts are ABS’ incorporation of the IACS CSR. The incorporation of the CSR, including the relationship to the other parts of the ABS Rules are indicated in the Forward of this booklet. No changes have been made and they remain in two volumes.

Part 5C – Specific Vessel Types, Steel Vessels

These are the Specialized Vessel Types currently covered by the Steel Vessel Rules. Chapter 1-6 and Chapter 7-12 are in separate volumes.

Part 5D – Specific Vessel Types, Offshore Support Vessels for Specialized Services

These are the Specialized Vessel types currently covered by the Offshore Support Vessel and Steel Vessels under 90m Rules.

Part 6 – Optional Items and Systems

This Part correlates to the current Part 6 of the Steel Vessel Rules. Only minor editorial revisions have been made.

Part 7 – Surveys After Construction

This was already a Generic Rule referenced by the SVR, U90M and OSV Rules hence only minor editorial revisions have been made.

In This Section

• --> Rules for Building and Classing Mobile Offshore Units (MOU Rules)