catamaran gross tonnage

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Vessel Gross Tonnage Calculator

How to calculate gross tonnage of recreational vessels?

The internal volume of a water-going vessel has what is called gross tonnage.

Volume is measured from keel to funnel and from bow to stern. Crew spaces and other parts of the vessel that do not hold cargo are deducted from the measurement.

Since most vessels have an asymmetrical shape it can be difficult to determine the actual gross tonnage.

A simplified set of small boat gross tonnage formulas is set forth by the U.S. Coast Guard, which are based on three measurements: Length (L), breadth (D), and depth (D). Under this system, the means of estimating gross tonnage is as follows:

• For a boat with a simple sailing hull: Gross Tonnage = (.5 x L x B x D) divided by 100.
• For a sailing boat with keel: Gross Tonnage = (.375 x L x B x D) divided by 100.
• For power boats: Gross Tonnage = (.67 x L x B x D) divided by 100.

How do I determine NET tonnage?

Net tonnage is 90% of gross tonnage for sailboats and 80% of gross tonnage for power boats. Our calculator will calculate gross tonnage and net tonnage. The US Coast Guard requires that all commercial vessels of 5 net tons or more be documented. Many recreational small boat owners wish to have their vessel measure over 5 net tons and thus be eligible for documentation as a "vessel of the United States."

When is it acceptable to use the Simplified Measurement System?

A vessel is eligible to be measured under the Simplified Measurement System if it is either: 1) under 79 feet in length; or 2) a non-self-propelled or recreational vessel. Recreational small boat owners may document their vessels with the US Coast Guard as long as their vessels are 5 net tons or more.

What is the history of gross tonnage as a measurement standard?

In the early days of shipping, vessels were valued and rated based on the maximum amount of cargo that could be held inside a vessel.

Each nook and cranny was filled with all types of good including, tools, cookware, machinery, spices, lumber, decorative goods, and cloth. To maximize the vessel's profit, each boat's value depended on how much the vessel could transport.

Tonnage was originally used to describe a physical space occupied by 100 cubic feet of ballast water. The amount of water was equal to about 2.8 tons. Even though a ton is a weight measurement and not volume, in maritime shipping tonnage came to refer to the volume or space available to hold marketable cargo.

In addition, the word "tun" was originally a size of a cask used to ship wine from Spain or Portugal to England. In 1347 a tax of 3 shillings per tun was imposed and this was called "tonnage."

A ship's size became known by the number of casks it could carry, and the word tonnage started being used to describe a ship's size.

Are there are documents available that could help me determine the exact gross tonnage of my vessel?

The US Coast Guard has a very detailed document that is available for download: Simplified Measurement Tonnage Guide (2009). This guide is in PDF format. You'll need the Adobe Reader to download this file.

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Performance

Bering catamarans are a new page in our history. We are dedicated to making this type of boat as popular and commanding a number of dedicated followers as our regular yachts. Safety and stability, practicality and craftsmanship, capability and innovation – this is a Bering boat, and we plan to make it the best multihull available.

Bering 60 CAT is 18.7 meters long, has a 8.6-meter beam and displaces 62.8 tons at full load. The gross tonnage of the basic model with an open flybridge is 109.7 GT. Also, the model is available with an enclosed flybridge whose gross tonnage is 121.2 GT. The distinct feature of this boat is its layout flexibility. 134.8 m2 of external and 116.4 m2 of internal space provide several options to modify her to the owner’s request. For example, this three-deck catamaran can be built with 4, 5, or even 6 staterooms under an open or enclosed flybridge.

Created by:

• Exteriors: Sabdes Yacht Design
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Brief Specifications

More than fifteen years ago, Bering went ahead of the curve by starting to make expedition trawler-type full-displacement steel yachts. Their capabilities and unique style gained attention of the explorer yacht enthusiasts and everyone who wanted a safe and sturdy yacht that performed like an expedition boat while being elaborately crafted and stylish. Now Bering makes another step ahead – we are beginning to make aluminum catamarans. It is both popular and practical, so we allow our customers to simultaneously follow the trends and reach their exploration goals.

At this moment, two catamarans were added to the Bering model line – B60 CAT and B80 CAT. Bering catamarans have combined the best of two worlds: stability of the cat design and luxury, quality of craftsmanship, and innovations Bering is known for. They are made for leisure as well as for conquering the seas in both hemispheres; even trans-Atlantic travel is possible.

Just like with the regular Bering yachts, three isolated external zones provide privacy to different guest parties if needed. The flybridge has a 27.7 m2 boat deck option with a crane. Optionally this area can be used as a lounge zone. The main deck has a sunpad on the bow, and a 47 m2 saloon, which is adjacent to the 25.2 m2 cockpit. To add to the relaxing atmosphere, the saloon has a galley with large panoramic windows.

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Boat Gross Tonnage Calculator

Author: Calculator Academy Team

Last Updated: July 26, 2023

Enter the boat length (ft), the boat breadth (ft), and the boat depth (ft) into the Boat Gross Tonnage Calculator. The calculator will evaluate the Boat Gross Tonnage. 

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Boat Gross Tonnage Formula

The following formula is used to calculate the Boat Gross Tonnage. 

• BGT is the Boat Gross Tonnage (tonnage)
• BL is the boat length (ft) 
• BD is the boat breadth (ft) 
• BW is the boat depth (ft) 

To calculate the boat gross tonnage, multiply the boat length, breadth, and depth together, divide by 2, then finally divide by 100.

How to Calculate Boat Gross Tonnage?

The following steps outline how to calculate the Boat Gross Tonnage.

• First, determine the boat length (ft).
• Next, determine the boat breadth (ft). 
• Next, determine the boat depth (ft). 
• Next, gather the formula from above = BGT = .5*BL*BD*BW /100.
• Finally, calculate the Boat Gross Tonnage.
• After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

boat length (ft) = 40

boat breadth (ft) = 10

boat depth (ft) = 8

BGT = .5*BL*BD*BW /100 =  ?

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Calculation of GT (Gross Tonnage) Help Needed

Discussion in ' Boat Design ' started by landbound , Mar 24, 2011 .

landbound Junior Member

Can anyone assist with regard to the measurement of GT (Gross Tonnage) for a catamaran sailing boat of approximately 14 Meters I do understand that most boating countries have a simplified calculation applicable to pleasure boats and in the case of the USA for craft below 5GT. This is not the case for Indonesia where the measurement is required. I want to own and sail a catamaran in Indonesia. The Indonesian shipping Law 17 / 2008 is clear that only an Indonesian may own or sail a boat avove 7GT. Thus any boat I build or buy must be below 7GT. I am fully aware of the CAIT that permits foreign flagged vessels to cruise Indonesia, however I am not looking for avoidance strategies however useful they have been for others. Anyone with a knowledge of International Convention on Tonnage Measurement of Ships, 1969 will realize it is purposed for cargo ships and to a lesser extent for passenger ships not for pleasure craft - thus an enthusiastic amateur is unlikely to get any calculation right, - not because the calculations are difficult but becuase the defintions are really unsuitable for catamarans - the full horror of the measurement methodology can be viewed here - http://untreaty.un.org/unts/60001_120000/21/34/00041700.pdf I am delighted to pay a professional to perform the calculations and would supply cad drawings that would allow the determination of internal volumes. That person must be "a competent person or organization recognized under the provisions of the international treaty" my guess is if you don't know if you are then you are not ! For me to engage such a person I would want evidence that they are authorized to certify by their relevant national authority and that they have some experience calculating GT on pleasure craft using the full treaty method not for example the US Coast Guard "simplified" calculation. With the greatest respect to any marine surveyor reading this, years of experience with tankers and bulk ore carriers is unlikely to be helpful. What will help is practical experience with the relevant authorities and knowing for example what the authorities view of the definition of a "deck" or "stepped deck" is with respect to a sailing catamaran. Equally welcome would be a contact that you know might be versed in such arcana. If you have managed to get to the end of this incredibly dull email I thank you and ask you to shed a tear for those who wish to sail legally in Indonesia without resorting to classic third world "fixes". Guy Warwick  

RAraujo Senior Member - Naval Architect

The ITC 69 is not applicable to boats under 24m (although some adaptations have been made in some countries, like those of EU, to extend its application). Most probably Indonesia will have their own regulations for calculating the tonnage of pleasure boats/boats under 24m). Check with the authorities which regulations are applicable - most probably there will be a simplified calculation (even if measurement is required). Measurements are required probably because most of the local boats are tradicionally built without a set of plans from where you can obtain the measurements. You can try to contact also one of the classification societies' local offices.  

No Pleasure boat Regulations in Indonesia Many Thanks there are no pleasure boat regulations in Indonesia other than a tax code for their importation. A simplified calculation does not exist as stated in my first post. The 24 metre rule is an exception to the 69 convention it is not an exception to Indonesian Regulations where calculation as per the convention is necessary to meet the 7GT test. Very unreasonable but that is the law. I have already approached a local surveyor and as I expected they have never had to calculate GT for a pleasure craft. Do you know anyone in your jurisdiction who might have experience with such a calculation on a sailing catamaran Thanks  

So it seems they are following the same scheme as the EU countries... The tonnage is quite easy to calculate - you just need to have the whole enclosed volumes of the boat. If you have a lines drawing and a general arrangement I can do it for you (for free) and without any warranties that it will be accepted. Anyway I've asked an idonesian naval architect, who is a friend of mine, to clarify this and I will get back to you if there are any news. Rodrigo  

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rodrigo you are very Kind I have PMed you my email address rodrigo you are very Kind I have PMed you my email address  

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Catamaran Design Formulas

• Post author By Rick
• Post date June 29, 2010
• 10 Comments on Catamaran Design Formulas

Part 2: W ith permission from Terho Halme – Naval Architect

While Part 1 showcased design comments from Richard Woods , this second webpage on catamaran design is from a paper on “How to dimension a sailing catamaran”, written by the Finnish boat designer, Terho Halme. I found his paper easy to follow and all the Catamaran hull design equations were in one place.  Terho was kind enough to grant permission to reproduce his work here.

Below are basic equations and parameters of catamaran design, courtesy of Terho Halme. There are also a few references from ISO boat standards. The first step of catamaran design is to decide the length of the boat and her purpose. Then we’ll try to optimize other dimensions, to give her decent performance. All dimensions on this page are metric, linear dimensions are in meters (m), areas are in square meters (m2), displacement volumes in cubic meters (m3), masses (displacement, weight) are in kilograms (kg), forces in Newton’s (N), powers in kilowatts (kW) and speeds in knots. 

Please see our catamarans for sale by owner page if you are looking for great deals on affordable catamarans sold directly by their owners.

Length, Draft and Beam

There are two major dimensions of a boat hull: The length of the hull L H  and length of waterline L WL  . The following consist of arbitrary values to illustrate a calculated example. 

L H  = 12.20      L WL  = 12.00

After deciding how big a boat we want we next enter the length/beam ratio of each hull, L BR . Heavy boats have low value and light racers high value. L BR  below “8” leads to increased wave making and this should be avoided. Lower values increase loading capacity. Normal L BR  for a cruiser is somewhere between 9 and 12. L BR  has a definitive effect on boat displacement estimate.  

• Tags Buying Advice , Catamaran Designers

Owner of a Catalac 8M and Catamaransite webmaster.

10 replies on “Catamaran Design Formulas”

Im working though these formuals to help in the conversion of a cat from diesel to electric. Range, Speed, effect of extra weight on the boat….. Im having a bit of trouble with the B_TR. First off what is it? You don’t call it out as to what it is anywhere that i could find. Second its listed as B TR = B WL / T c but then directly after that you have T c = B WL / B TR. these two equasion are circular….

Yes, I noted the same thing. I guess that TR means resistance.

I am new here and very intetested to continue the discussion! I believe that TR had to be looked at as in Btr (small letter = underscore). B = beam, t= draft and r (I believe) = ratio! As in Lbr, here it is Btr = Beam to draft ratio! This goes along with the further elaboration on the subject! Let me know if I am wrong! Regards PETER

I posted the author’s contact info. You have to contact him as he’s not going to answer here. – Rick

Thank you these formulas as I am planning a catamaran hull/ house boat. The planned length will be about thirty six ft. In length. This will help me in this new venture.

You have to ask the author. His link was above. https://www.facebook.com/terho.halme

I understood everything, accept nothing makes sense from Cm=Am/Tc*Bwl. Almost all equations from here on after is basically the answer to the dividend being divided into itself, which gives a constant answer of “1”. What am I missing? I contacted the original author on Facebook, but due to Facebook regulations, he’s bound never to receive it.

Hi Brian, B WL is the maximum hull breadth at the waterline and Tc is the maximum draft.

The equation B TW = B WL/Tc can be rearranged by multiplying both sides of the equation by Tc:

B TW * Tc = Tc * B WL / Tc

On the right hand side the Tc on the top is divided by the Tc on the bottom so the equal 1 and can both be crossed out.

Then divide both sides by B TW:

Cross out that B TW when it is on the top and the bottom and you get the new equation:

Tc = B WL/ B TW

Thank you all for this very useful article

Parfait j aimerais participer à une formation en ligne (perfect I would like to participate in an online training)

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• Impressions

Delivered in 2016, Dilbar is the largest motor yacht in the world by gross tonnage. She is one of the most complex and challenging yachts ever built, in terms of both dimensions and technology. At 15,917 tons, the 156-meter superyacht features entertainment and recreation spaces never before seen on a yacht. These include a 25-meter swimming pool that holds an incredible 180 m³ of water, the largest pool ever to have been installed on a yacht. The exterior design, a classic profile with a light ivory hull and bronze accents, was developed by Espen Øino International. Her spectacular interior, created by the Winch Design team, uses rare and exclusive luxury materials.

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The top 25 largest yachts in the world

Every year, shipyards from around the world push the boundaries of superyacht design to deliver bigger and better yachts. The Samuda-built El Mahrousa may have carried the title unchallenged for a remarkable 119 years, but in the 21st century, she has descended down the pecking order to make room for even larger and longer yachts. German shipyard Lürssen currently holds a near monopoly in the construction of supersized superyachts, having delivered 13 of the world’s top 25. But the list is ever-changing with the 158 metre Blue breaking into the top five in 2022. These yachts, all measuring over 100 metres, are impressive not only for their hull length but for what they carry above and below deck. From submarines and helicopters to swimming pools , cinemas and science labs, the onboard features of these superyachts show them to be truly ground-breaking pieces of engineering. Read on to discover our official list of the largest, privately owned yachts in the world.

1. Azzam | 180.6m

In October 2013, Lürssen delivered the largest privately owned superyacht in the world in the form Azzam . Originally, she was designed to be 145 metres, but in the process of optimisation grew to 180 metres. Other stunning facts about Azzam’s impressive design include her staggering 13,000 GT and accommodation for 36 guests and as many as 80 crew members. The behemoth was reportedly built for Sheikh Khalifa bin Zayed al-Nahyan of Abu Dhabi’s royal family, for use as a dayboat to reach his favourite diving grounds. The main saloon alone encompasses nearly 522m² and has a relaxed French Empire style and mother of pearl finishes, designed by Christophe Leoni . On board features include a gym, pool and a special ‘golf training room’.

Exteriors have been penned by Nauta Yacht Design , and the technical engineering was directed by Mubarak Saad al Ahbabi for the owner. The yacht has an impressive speed for her size owing to her innovative water-jet propulsion system (two fixed jets, two directional), which catapults her along at a staggering 31.5-plus knots. At 17.5 metres longer than Roman Abramovich’s Eclipse , this boat takes the prestigious title of the world’s largest yacht. The all-white superyacht has held her title unchallenged for nearly seven years, but this reign will come to an end with the expected delivery of 183 metre REV .

• Builder: Lurssen
• Country of build: Germany
• Delivery year: 2013
• Length Overall: 180.61 m
• Gross Tonnage 13136 t

More about this yacht

More stories, 2. eclipse | 162.5m.

After five years of intensive design, development and construction, Eclipse left the Blohm + Voss yard in December 2010. She carried the title of world’s largest superyacht for just three years before being usurped by Azzam . Managed by Blue Ocean Yacht Management, Eclipse features a diesel-electric propulsion system with generators powering rotating Azipod drives, dramatic exterior styling and a stunning interior design by London-based Terence Disdale Design , which has been responsible for all aspects of aesthetic design and layout, including the superstructure design, deck layouts, interior design and construction supervision. Eclipse was voted Motor Yacht of the Year at the World Superyacht Awards in 2011 and Motor Yacht of the Decade at the 10th World Superyacht Awards in 2015.

Her accommodation includes an owner’s deck of 56 metres in length and facilities for up to 92 crew. Her interior boasts hundreds of custom finishes exclusively developed especially for this project, while her deck areas include a 16 metre swimming pool which can be transformed into a dance floor. The yacht can also accommodate three helicopters, one on each of the two helipads and the third in a storage hangar below the fore deck.

• Builder: Blohm & Voss
• Delivery year: 2010
• Length Overall: 162.5 m
• Gross Tonnage 13564 t

3. Dubai | 162m

Dubai was originally commissioned by Prince Jefri of Brunei with exterior styling and interior design by Andrew Winch . The Blohm & Voss project was suspended in 1998 with just the bare hull and partially complete superstructure. It was eventually sold to the Dubai government, and responsibility passed to Kostis Antonopoulos of Platinum Yachts , which prepared a new in-house interior design completed in 2006.

The aptly named Dubai is the royal yacht of Sheik Mohammed bin Rashid al-Maktoum of Dubai. The accommodation, styled by Nakheel Interiors , is designed for 24 guests and comprises an owner’s suite, five VIP suites and six guest suites, all with open balconies. Special features include a 21.3m-wide atrium, a swimming pool, barbecue area, cinema, disco, a landing platform for a Blackhawk helicopter, a gymnasium, and a garage for the yacht’s submarine and a vast array of water toys. Full certification was obtained from Lloyds Register of Shipping in October 2006 and she has since made several voyages. She can reach a maximum speed of 25 knots.

• Builder: Platinum
• Country of build: United Arab Emirates
• Delivery year: 2006
• Length Overall: 162 m
• Gross Tonnage 12488 t

4. Blue | 158m

Taking her place at number four in the list of the world’s longest yachts, Lürssen’s Blue is so voluminous that she beats all the longer boats in terms of gross tonnage. Built for a Middle Eastern owner, she is exceeded for internal space only by those behemoths Dilbar (15,917GT) and Al Said (15,850GT). Terence Disdale has penned classic exterior lines with a sharply raked bow and gentle curves to the deep overhangs of the decks. The main helipad is positioned on the bow, with a smaller one aft. Other exterior features include a pool under cover on the main deck aft, a bathing platform at the stern and twin balconies flanking the owner’s cabin forward. Blue ’s interior is designed to be timeless and rich in “feminine elegance”, a deliberate contrast to the exterior. 

Blue is equipped with a diesel-electric hybrid propulsion system that was developed in-house. An electric Azimuth pod drive can manoeuvre the boat alone or in conjunction with the twin propeller shafts. To reduce noise, vibration and NOx levels, Blue has a state-of-the-art exhaust treatment system. The boat is also equipped with new membrane technology that means her treated waste water achieves drinking water quality.

• Delivery year: 2022
• Length Overall: 160.6 m
• Beam: 22.5 m
• Gross Tonnage 14785 t

5. Dilbar | 156m

With a total interior volume of over 15,000 GT, Dilbar is the largest yacht in the world by gross tonnage, if not by length. She was built in steel and aluminium by Lürssen to a design by Espen Øino . In 2016, she was delivered in the Mediterranean for her owner, the Uzbekistani billionaire Alisher Usmanov. She replaced Usmanov’s previous yacht of the same name, which has since been renamed Ona . She is usually spotted cruising around the South of France, northern Spain and sometimes Cyprus.

Record-breaking features on board this SOLAS-class superyacht include her 180 cubic metre swimming pool and her 30,000KW electric diesel power plant. Her interiors, styled by Winch Design, can accommodate up to 24 guests served by nearly 100 crew members. She also has two helipads, 3,800 square metres of living space amd an expansive garden complete with a specially developed variety of grass that tolerates salt air, according to its creator Axel Massmann. Dilbar has a single colour for her exterior, a buttery cream shade, that makes her instantly recognisable at sea and can reach a top speed of 21 knots.

• Delivery year: 2016
• Length Overall: 156 m
• Beam: 23.5 m
• Gross Tonnage 15917 t

6. Al Said | 155m

This Lloyd’s-classed vessel, known as Project Sunflower during construction, was delivered by Lürssen’s Vegesack yard to her owner, Sultan Qaboos bin Said Al Said of Oman, in March 2008. Measuring an impressive 155 metres, Al Said is the principle vessel of the Oman Royal Yacht Squadron. Designed by Espen Øino with the looks of a classic cruise liner, she sails under the Omani flag and her home port is Muttrah Harbour in Muscat. 

This Germanischer Lloyd-classed, 15,850GT yacht can reach a top speed of 25 knots and is reported to have a crew capacity of 150. Her panelled interiors, designed in a traditional style by Jonathan Quinn Barnett , offers huge entertaining spaces and accommodation for 65 guests. Her pièce de résistance is the on-board concert hall that can accommodate a 50-strong orchestra, but across her six decks she also has a helipad and a cinema.

• Delivery year: 2008
• Length Overall: 155 m
• Gross Tonnage 15850 t

7. El Mahrousa | 150.6m

El Mahrousa was first delivered by the Samuda Brothers shipyard in 1865. She held on to the title of longest yacht in the world for over a century before finally being usurped by the delivery of Prince Abdulaziz in the 1980s. She was originally built for the Ottoman governor of Egypt, Khedive Ismail, receive visiting dignitaries. and was present at the opening ceremony of the Suez Canal in 1869, when she was used to receive visiting dignitaries. She was lengthened by 12.1 metres in 1872, when her paddle wheels were removed, and by a further 5.2 metres in 1905. Her last major rebuild was in 1950.

Significant moments in her lifetime include her participation in 1976 as the Egyptian representative at the Bicentennial Fleet Review in New York harbour. She slipped into disrepair after this while being used as a museum ship. In 1992, a major effort was put into making her seaworthy enough to travel to Italy for the Christopher Columbus Fleet Review. She now serves as the Egyptian Presidential Yacht but is seldom seen in public. She is usually berthed in Alexandria, where she is cared for by the Egyptian Navy, which lists her as a training ship. Powered by three Parsons steam turbines, she can achieve a top speed of 16 knots.

• Builder: Samuda
• Country of build: United Kingdom
• Delivery year: 1865
• Length Overall: 150.57 m
• Beam: 12.98 m
• Gross Tonnage 4560 t

8. A+ | 147.3m

Formerly known as Topaz , the Tim Heywood -designed A+ was launched by Lürssen in 2012 and uniquely features Heywood’s signature illuminated on her superstructure. Although she flies a Cayman flag, her owner is a member of the UAE elite – reportedly Sheikh Mansour bin Zayed al-Nahyan, who also owns the UK’s Manchester City football club.

Having previously been chartered twice by Hollywood actor Leonardo DiCaprio, the 147.25 metre superyacht features a helicopter landing pad located at the bow and her interiors have been designed by Terence Disdale – but not much else is known about this superyacht, as many of her details are still shrouded in secrecy.

• Delivery year: 2012
• Length Overall: 147.25 m
• Beam: 21.5 m
• Gross Tonnage 12532 t

9. Prince Abdulaziz | 147m

The 5,200-tonne Prince Abdulaziz was delivered by Danish shipyard Helsingor Vaerft in 1984 to her first owner, King Fahd of Saudi Arabia. Since then, she has continued to serve the Saudi royal family and is berthed beside the king’s palace in Jeddah. She has been refitted three times; in 1987, 1996 and in 2005.

Prince Abdulaziz was built at a reported cost of $184m to a design by Maierform . Her interior, designed by the late David Hicks , blends ancient and modern. One notable feature is the large lobby, said to be designed to mimic that of the Titanic . She includes a hospital, a mosque and a cinema, and there are also rumours of surface-to-air missiles and an underwater surveillance system on board. The mega yacht can accommodate as many as 64 guests and is manned by a crew of 65.

• Builder: Helsingor Vaerft
• Country of build: Denmark
• Delivery year: 1984
• Length Overall: 147.01 m
• Beam: 18.3 m
• Gross Tonnage 8233 t

10. Opera | 146.4m

Reportedly built for a senior Emirati royal, Opera 's size and gross tonnage catapult her directly into the ranks of the world's 10 biggest private yachts. The 146.4-metre yacht certainly has some of the hallmarks of a Middle Eastern boat, with deep overhangs between decks and lots of enclosed deck space hinting at use in an aggressive climate. Pictures taken during a maiden voyage from Bremen to Portsmouth last summer showed lots of floor-to-ceiling glass across six guest decks, as well as two helicopter landing spots and a beach club whose twin staircases must climb two decks to reach a 10-metre, stone-lined pool aft of the main deck. The pool rises to form a dance floor.

Lürssen has kept the project shrouded in secrecy, but designer Terence Disdale confirmed that interior facilities include a cinema and an extensive spa and wellness centre, plus other features that are being kept under wraps. He also mentioned an upper lounge with a 110-inch television and bay windows.

• Delivery year: 2023
• Length Overall: 146.35 m
• Gross Tonnage 12518 t

11. OK | 146m

This unusual vessel spent decades plying the seas as a float-on yacht carrier for DYT Yacht Transport with the unglamorous moniker Super Servant 3 – and it is this carrying ability that caught the owner’s eye.

40 years after its original launch by Japan’s Oshima Shipbuilding , the yacht emerged from a root-and-branch refit at Karmarine in Turkey. The exterior has been smartened up, with a new matt-black paint job, gold-tinted glazing, teak decking at the bow, stern and sides and an expanse of artificial grass on the submersible aft deck – an idea of the owner’s, to enliven the guest cabins’ view. There are reports that this space doubles as a tennis court and, at 32 metres by 100 metres, there would certainly be the room for it.

With a strengthened hull, the boat’s original role as a yacht carrier has been enhanced. Pumping ballast into tanks under the aft deck allows the platform to lower so that the owner’s 46-metre ketch can be floated aboard and secured. There’s also a 40-tonne crane for positioning other toys – reportedly up to 70 of them, from launches and cars to a seaplane.

Under the direction of Bozca Design , Karmarine has stripped out and rebuilt the accommodation area at the front of the yacht. There are cabins for up to 20 guests, a glazed sundeck spa pool, a "botanical" garden and an outdoor cinema. The lift between decks runs through a glass tower outside the superstructure. 

• Builder: Oshima Shipbuilding
• Country of build: Japan
• Delivery year: 1982
• Length Overall: 146 m
• Beam: 32.01 m
• Gross Tonnage 11296 t

12. Sailing Yacht A | 142.8m

This Philippe Starck -designed vessel is the second superyacht commissioned by Russian businessman Andrey Melnichenko, after his first Motor Yacht A . She was built in Germany by the Nobiskrug yard and delivered in February 2017.

A sail-assisted yacht like no other, Sailing Yacht A comprises eight decks, and her rotating curved carbon fibre masts tower to 100 metres. She is made to set 3,747 square metres of sail and is manned by crew of 54. She sports an underwater viewing pod (moulded into the keel) and balconies enclosed by the largest pieces of curved glass ever. There are 24 shell doors in her hull, and she has a diesel-electric power plant controlled by computer. Records claimed by the Starck superyacht include the world's tallest carbon masts, with the tallest standing at 100 metres above sea level.

• Builder: Nobiskrug
• Delivery year: 2017
• Length Overall: 142.81 m
• Beam: 24.88 m
• Gross Tonnage 12700 t

13. Nord | 142m

Nord started life as Project Redwood, then Opus. Everyone involved in her design and build has remained tight-lipped about the details, but build manager Rob Moran shared some exclusive insight with BOAT International .

First up, she has an Ice Class hull for real exploration. Her aluminium superstructure runs to four decks, contained within the dramatic sweep of a black-painted arch – a key part of the vision of designers Nuvolari Lenard . Not one but two helipads are in evidence, while a vast beach club and tender garage gives  "space to store a plethora of toys including 16 tenders, a submarine and an ROV", according to Moran. The largest tender reportedly measures 15 metres, and there is a watersports and dive centre on the lower deck. Nord has a generous touch-and-go helipad at its heavily flared aircraft carrier bow, but there is also a much bigger space aft up on the bridge deck that offers landing, parking and bunkering for the owner’s helicopter, as well as an entire hangar for protection during longer passages. 

Also visible to onlookers was the exceptional 25-metre-long swimming pool on the main deck aft, plus a spa pool on the upper deck. Her interior is reported to include a gym, spa, sauna and a whole deck devoted to the owner.

• Delivery year: 2021
• Length Overall: 141.6 m
• Beam: 19.5 m
• Gross Tonnage 10154 t

14. Yas | 141m

Delivered in 1978 by De Schelde as a navy frigate, Yas was rebuilt in 2013 by Abu Dhabi MAR. Previously known under the project name Swift 141, she was completely modified with new machinery and electronic systems and outfitted with a luxurious interior. It has been suggested that her owner is a member of the Emirati royal family.

She has been designed inside and out by Pierrejean Design Studio of Paris . The unique superstructure of Yas is built in advanced composites and glass and was supposedly inspired by the profile shape of a dolphin. She is reportedly able to accommodate 60 guests and 56 crew, and on-board features include a heli-pad and al fresco dining spaces aft, and a Jacuzzi on her top deck. Her beach club Jacuzzi is complemented by a waterfall feature and a spiral staircase connects her the multiple decks. Powered by twin MTU diesels, Yas has a top speed of 26 knots.

• Builder: De Schelde
• Country of build: Netherlands
• Length Overall: 141 m
• Beam: 14.6 m
• Gross Tonnage 5002 t

15. Ocean Victory | 140m

Ocean Victory was completed at Fincantieri’s Muggiano yard in Italy after launching in April 2014. This seven-deck yacht is based on a design by Espen Øino and her interior is by Alberto Pinto and Laura Sessa . She has internal seawater dockage for a 14-metre tender and six pools of up to 8 metres in length. There’s a certified helideck and a hangar to store the aircraft, while inside Ocean Victory boasts an underwater observation room and more than 300 square metres of spa facilities. She is SOLAS-classed and is the largest yacht ever built in Italy. 

In 2016, the superyacht world was shocked and saddened to hear of the death of one of Ocean Victory’ s crew members, who suffered critical leg injuries while setting the anchor off the coast of Mu Ko Similan National Park in Thailand. Little else is known about this top-secret yacht, which is kept much under wraps and away from prying eyes.

• Builder: Fincantieri
• Country of build: Italy
• Delivery year: 2014
• Length Overall: 140 m
• Gross Tonnage 8506 t

16. Scheherazade | 140m

Another titan by Lürssen , Scheherazade carries the same name as the enigmatic story-teller of the Middle Eastern epic One Thousand and One nights . She hit the water in July 2019 and offers phenomenal volumes at 10,167 GT. Her Espen Øino exterior features a four-deck aluminium superstructure with elegant tapering roofs and an eclectic range of coloured LED exterior lighting. She also has two large helipads – one at the bow and one on the upper deck – plus a prominent beach club aft. 

There is very little information regarding her interior by François Zuretti , but if the work of the French design house on 106-metre Amadea is anything to go by, it is imperious and sophisticated. With the owner known to be a Middle Eastern billionaire, this yacht is designed with warmer climates in mind. Temperatures in excess of 45 degrees Celsius are quite normal in the region during the summer months, so Scheherazade has relatively little exterior space for a yacht of this size. There is limited covered deck space at the aft end of the main and upper decks, but it is well enclosed by glass sides for cooling. Even the sundeck is completely shaded by a hardtop, which all helps to give her an astonishing internal volume.

• Delivery year: 2020
• Beam: 23.3 m
• Gross Tonnage 10167 t

17. Solaris | 140M

The 140-metre expedition yacht Solaris was launched in the city of Bremerhaven in February 2021 as the flagship model of German shipyard Lloyd Werft . She is the debut project of Australian designer Marc Newson , who has given her a dramatic grey and white superstructure which features a unique fashion plate which wraps around the mast and connects both sides of the hull. Spanning eight decks in total, Solaris has been constructed in aluminium and steel and offers a 26-metre beam. Little information has been shared about her interiors, but her exterior is equipped with a large helipad, a sun deck and a spacious beach club aft.

Turning to the technical elements, Solaris is reportedly outfitted with a power and energy management system from ABB and features two Azipods powered by nine megawatts – the most powerful propulsion system of its kind to ever be installed on a yacht. She runs on a total of eight MTU diesel engines, providing 19,040hp. Little else is known about the superyacht, on which construction first began in 2018.

• Builder: Lloyd Werft
• Length Overall: 139.7 m
• Gross Tonnage 11247 t

18. Al Salamah | 139.3m

Built by the consortium of Howaldtswerke Deutsche Werft (HDW) in Kiel and the Lürssen shipyard in Germany, Al Salamah is often referred to as "Mipos", the code name used during the construction of this most secret of yachts. Mipos was short for "Mission Possible" – a statement proved correct by her delivery in 1999.

She has a length of 139.3 metres, a massive beam of 23.5 metres, and is reported to have a top speed of 21.5 knots. Both the interior design and the exterior styling are by the London-based Terence Disdale Design . Al Salamah was owned by the late Sultan bin Abdulaziz of Saudi Arabia, who also owned 147 metre Prince Abdulaziz . She was refitted by Lürssen in 2007 and is rumoured to carry a hospital room with an underwater treadmill for physical therapy on board.

• Delivery year: 1999
• Length Overall: 139.29 m
• Gross Tonnage 12234 t

19. Luminance | 138.8m

Espen Øino is repsonsible for this giant yacht's crisp exterior lines. Despite a traditional raked bow, she looks bang up to date with a gleaming hull and superstructure that counterpoise dark blue and silver to create a masculine look. Øino has played with the profile of the overhangs to give the illusion of reverse sheer amidships. The effect is especially striking when viewing the yacht from beam-on. Her twin helicopter pads – one on the foredeck and another high up aft – will make her capable of ambitious explorer programmes. She also boasts a large beach club and an infinity pool, with a private spa pool area on the foredeck of what may be an owner's deck.

Luminance was expected in 2023, but delivery has fallen back a fraction. It is a mammoth project, whose true length has only just been confirmed at 138.8 metres. Her Ukranian owner, mining and financial services mogul Rinat Akhmetov, told The New York Times last year that he was mulling the boat's sale following Russia's invasion of his homeland, but it's not known whether he followed through.

• Delivery year: 2024
• Length Overall: 138.8 m
• Gross Tonnage 8999 t

20. Rising Sun | 138m

Rising Sun was built for Larry Ellison, co-founder and CEO of Oracle. She's the last yacht that ever came from designer Jon Bannenberg’s drawing board, with interiors styled by   Laura Seccombe . Rising Sun ’s naval architecture experimented with an extensive use of structural glass for a clean and stripped-down profile.

In 2006, Ellison sold half ownership to media mogul David Geffen, who bought the remaining half in 2010. Rising Sun is reported to have cost more than $290,000,000 and was extended by 18 metres in-build to ensure she was larger than the 126.2-metre Octopus , belonging to Microsoft’s co-founder, Paul Allen. Her 8,000 square metres of living space can accommodate 45 crew members, and includes a wine cellar and basketball court, plus accommodation for 16. One of her tenders, a catamaran, carries the yacht’s 4x4 vehicle ashore.

• Delivery year: 2004
• Length Overall: 138.01 m
• Gross Tonnage 7600 t

21. Flying Fox | 136m

Formerly Project Shu, PYC-compliant Flying Fox was built by Lürssen for a serial charter yacht owner and completed her sea trials off the coast of Germany in May 2019. The 136-metre, six-deck yacht towers 32 metres above the waterline – as tall as three London buses balanced end on end. Her elegant, well-balanced profile by Espen Øino conceals an extraordinarily voluminous interior by Mark Berryman , including a double-height atrium that forms the main deck lobby. There are 11 cabins for 36 guests, all with private sea-view terraces, and expansive outdoor living spaces, such as a 12-metre swimming pool transversing the main deck aft, swim platforms and two helipads. The 400-square-metre spa is the stand-out feature. It has heated limestone floors, a Hammam, massage and beauty treatment rooms and the first cryosauna ever installed on a yacht, with a main chamber that reaches a chilly -110C. There’s also an on-board hospital.

One of the most expensive superyachts in the world available for charter , Flying Fox is crewed by an experienced team of 54. She boasts a toybox stuffed with jet skis and other Seabobs, hoverboards, room for a submarine and and nine different tenders. Plus, she even has her own dive centre and kite surf store on board.

• Delivery year: 2019
• Length Overall: 136 m
• Beam: 20.5 m
• Gross Tonnage 9100 t

22. Savarona | 135.9m

Built by Blohm + Voss for American bridge cable heiress Emily Roebling Cadwalader in 1931, Savarona was sold in 1938 to the Turkish government and became the presidential yacht of Kemal Atatürk. In 1989, Kahraman Sadikoglu obtained a 50-year lease and, with investors, spent $35,000,000 on the refit of this classic superyacht, including a library suite dedicated to the memory of Atatürk and furnished with his personal artefacts. In 2010, after an alleged scandal, the Turkish government cancelled the lease and resumed ownership. In 2014, she was refurbished and now serves as the state yacht of Turkey. 

Savarona was, for a time, offered on the market for superyacht charters around Istanbul, although she is no longer available to the public. Key features onboard this superyacht include a marble-finished Turkish hammam bath that spans the entire 16-metre beam, a swimming pool, a gold-trimmed grand staircase and a private cinema. She is named after a type of black swan found in the Indian Ocean region.

• Delivery year: 1931
• Length Overall: 135.94 m
• Beam: 16.12 m
• Gross Tonnage 4701 t

23. Crescent | 135.5m

Crescent , formerly Project Thunder, has what the yard called a "traditionally-styled" interior by Zuretti , exterior design by Espen Øino and naval architecture by Lürssen . Øino went to great lengths to maximise what he calls the "vision lines" from the interior and the decks – especially from the centreline, which on such a beamy boat is a long way from the sides – by having full height windows and keeping the bulwarks as low as possible.

She has a steel hull and aluminium superstructure and was built to DNV GL standards. Her striking black hull is matched with a silver superstructure that has distinctive wing stations amidships. Just forward of the wing stations are three-deck windows, providing spectacular views for her 18-strong guest list.

• Delivery year: 2018
• Length Overall: 135.5 m
• Gross Tonnage 9194 t

24. Serene | 133.9m

Built for a Russian owner, Serene was the first superyacht delivered by Italian yard Fincantieri . She can accommodate up to 24 guests and 52 crew, and boasts 4,500 square metres of interior space designed by Reymond Langton .

Serene has seven decks, two helipads and a hangar, carries a custom submarine certified to 100m depth and has underwater viewing ports in her Nemo room. A "snow room" can make up to four inches of snow, while the impressive spiral staircase rises through six decks and is lit by a large skylight. Serene won Best Motor Yacht of 3,000GT and Above at the 2012 World Superyacht Awards. Powered by a diesel engine, Serene can reach a top speed of 20 knots and has a maximum cruising range of 6000 nautical miles.

• Delivery year: 2011
• Length Overall: 133.9 m
• Beam: 18.6 m
• Gross Tonnage 8231 t

25. Al Mirqab | 133m

Al Mirqab was built by Peterswerft - Kusch for Hamad bin Jassim bin Jaber Al Thani – the former prime minister of Qatar. Her exterior design is by Tim Heywood and her interiors were styled by Winch Design . She is propelled by five generators that power two electric motors driving conventional shafts and a centrally positioned azimuthing electric pod drive. A grand staircase floats through four floors and surrounds suspended glass artwork by Dale Chihuly. 

Al Mirqab won Motor Yacht of the Year at the World Superyacht Awards 2009 and Best Interior Design among motor yachts. She can accommodate 60 guests and is manned by an equal number of crew.

• Builder: Peterswerft - Kusch
• Length Overall: 133 m
• Gross Tonnage 5000 t

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The 5 largest yachts by gross tonnage at the Monaco Yacht Show 2018

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By Rebecca Bradbury   14 September 2018

The 2018 Monaco Yacht Show is fast-approaching, and as 120 one-off superyachts prepare to go on display, YachtCharterFleet reveals the five largest on the line-up according to gross tonnage.

In an article written last week, we rounded up the 5 largest yachts attending the Monaco Yacht Show by length . But, below we list - in ascending order - the yachts with the biggest gross tonnage - a measurement that refers to a yachts’ overall internal volume.

#5 Areti – 2,817 GT

The 85m/279ft superyacht ARETI , a Lurssen build, was fifth on the list for the longest yachts signed up for the upcoming show and stays in the same place when comparing the interior volume.

She returns to the event after making her worldwide debut at the 2017 edition and is expected to once again capture much attention for both her vast expanse and world-class amenities. Among these are gym and spa facilities designed for elite athletes and space for 20-plus guests.

The interior styling from Andrew Winch Design is also notable for its fresh American-classic theme. This has been created by combining makore joinery, Emperador and Borricno marble floors and brass accents. 

#4 Aquarius - 2,980 GT

After making her debut at last year's edition of the Monaco Yacht Show, the 92m/302ft  motor yacht AQUARIUS is reappearing and takes fourth spot on the leaderboard for her gross tonnage.

The luxury yacht was designed by Feadship, and features immaculate interiors with accommodation for up to 14 guests. She is one of the most recent yachts to confirm her attendance at the event.

Though sadly not available for private yacht charter, the yacht will be on display for show-goers to admire her sleek and contemporary finish. High windows allow light to flood in and bathe her interior spaces, giving the superyacht an elegant and sophisticated edge.

#3 Barbara – 2,984 GT

Oceanco ’s 88m/290ft charter yacht BARBARA comes in as the fourth largest yacht by length but, at 2,984 GT, the third largest yacht by volume. With her dark hull and shapely superstructure, the 2017 launch will certainly not be hard to spot lined up in Monaco’s Port Hercules.

Show attendees lucky enough to climb aboard will also find it impossible not to note her unusual layout. Most noteworthy is the owner’s office which, located in the central area of the yacht, has drop-down balconies either side to create a huge expanse filled with fresh air and natural light.

The self-contained master suite, meanwhile, is located forward on the owner’s deck and other distinctive features include an aquarium by Living Color in the main salon, a lower deck cinema with Lay-Z Boy chairs and a striking timber and metal vine sculpture that wraps its way around the lift shaft.

#2 Dar – 2,999 GT

Not only will the 90m/295ft superyacht DAR – also from Oceanco - be the second largest yacht by volume to appear at MYS 2018, but she will be the second largest yacht by length at the event.

Launched in July, she is one of the most exciting superyachts to hit the water this year due to her ground-breaking design and technological innovations. Making her worldwide debut at the show, she is expected to attract much attention and acclaim.

One of her radical features is the glass-clad exterior and this has been designed in harmony with the interior. Based on the theme of nature, the inside guest living areas are said to be decorated in fine fabrics, wall paper, 3D lacquer and woods such as Brazilian Carballo and bleached grey maple.

#1 Illusion Plus – 3,642 GT

Ranking in first place with a huge volume of 3,642 GT is the 89m/291ft motor yacht ‘Illusion Plus’ from Chinese shipyard Pride Mega Yachts. This figure is an impressive 643 GT ahead of her nearest rival (DAR) and may be surprising given that, at 89 metres, she is only the third longest yacht on the line-up.

Similarly to DAR, she was launched this summer and will be premiering at the yachting event after undertaking her maiden voyage from China to Monaco . She is expected to receive a warm welcome from industry professionals keen to discover her unparalleled sense of space and luxury interior.

A dedicated spa, beauty salon and gymnasium, and an 80-square-metre master suite are just a few of her highlights for guests to enjoy, while a diesel-electric propulsion package by Rolls Royce ensures the ultimate in cruising performance and energy efficiency.

For further details on any charter yacht at MYS 2018, speak to your preferred charter broker .

Alternatively, view all superyachts attending the Monaco Yacht Show 2018 .

A selection of charter yachts at the Monaco Yacht Show 2018:

63m Holland Jachtbouw 2010 / 2023

55m Heesen 2011 / 2022

46m Palmer Johnson 2010 / 2022

95m Lurssen 2014

89m Oceanco 2017

51m Heesen 2018

72m Tankoa Yachts 2018 / 2023

38m Custom Line 2018

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• Monaco Yacht Show 2018
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By SuperyachtNews 10 Aug 2022

Is GT just a gross misconception?

The lingering fascination with gross tonnage affects how superyachts are valued…but is there a better metric.

The metrics by which we measure superyachts carry value connotations. But value to who? Misconceptions around the true definition of gross tonnage persist across many areas of the industry. Gross tonnage, the second figure quoted in most references to a yacht after LOA (length overall), is a measurement that traces its origin to the merchant fleet using the moulded volume of enclosed spaces of the ship. It may be, however, be an outdated measurement when simplistically attributing value to the user of a yacht.

Originally these findings were published in the Superyacht New Build Report, using Data Supplied by The Superyacht Agency and Rob Doyle Design. The latter whose reimaging of the concept of 'usable space' onboard the convention-busting concept "Project Fury'  led to this piece. 

The relationship of GT to the amount of lived-in space is weak. Even the most extravagant real estate does not include a volumetric measurement. Square metres give the floor space, and the three-dimensional space is inferred. Obviously, it has many applications across the commercial sector and for purposes of classification, but its persistence in the superyacht sector leads to misunderstandings.

As a mathematical curiosity, it’s intriguing. Volume increases as the length, width and height of a shape increase (by the power of three). Increase the length of the sides of a cube from one metre to three metres and the volume will grow to 27m3, for example. Large yachts’ cubic spaces (GT) increase disproportionately with length.

The growth of this curve is not as drastic X to the power of 3, as would be expected from perfect cubes, but it does still convey the disproportionate increase in GT vs LOA. Converting this to a meaningful statistic is challenging and should not be taken at face value.

Figure 3, below, shows a selection of well-known sailing yachts and motoryachts plotting GT vs LOA, and while not directly comparable, the less pronounced trend is clear. Sailing yachts do not exhibit a very noticeable increase in volume vs length because, in general, they don’t grow in height vs length in the same way that a motoryacht does. Nothing revelatory there.

The intriguing difference comes when a different metric is applied. By carefully analysing the GAs of a selection of sailing yachts, in partnership with Van Geest Design, and selecting the ‘usable’ spaces, a different distribution can be seen, as shown in Figure 4, below.

Usable space has been calculated here manually but it is broadly the guest usable spaces, no technical walkways, no winch spaces, tender garages or limo bays etc. These spaces are then divided by the cubed route of the floor plan vs GT to remove the volumetric consideration. This is then plotted against the square root of the length vs the length on deck, not the length overall, again to consider the usable spaces. This re-evaluation produces a far less reductive distribution.

S/Y Vertigo, a 67m vessel with 837GT and one of the larger sailing yachts, sits above the trend line in Figure 3, suggesting a high return of internal spaces. However, when taking into account just the interior spaces that can be used by removing outlying space, it falls below the trend line in Figure 4. Conversely, S/Y M5 moves from average to well above the trend line.

This is a concept that requires input, not least from designers and yards, but it allows for more specific consideration of a yacht’s usable space. The majority of this data is available but requires manual manipulation and CAD analysis of GAs. It does, however, offer an alternative and unique re-evaluation of value to the client.

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Calculating GRT for Mariner Credentials

I have a question about Gross Registered Tonnage for Mariner Licensing. A good portion of my sea time is on a private yacht that just shows Gross Tonnage on the COI, not Gross Registered Tonnage. Is there a formula used to determine Gross Registered Tonnage for a vessel for Mariner Credentials? Thanks in advance,

The USCG considers 1600 GRT equal to 3000 GT.

I’m not sure what they do about smaller vessels.

Here is what I have used for CG 719S Sea Service Form.

A simplified set of gross tonnage formulas is set forth by the U.S. Coast Guard Marine Safety Center, which are based on three measurements: Length (L), breadth (D), and depth (D). Under this system, the means of estimating gross tonnage is as follows:

For power boats: Gross Tonnage = (. 67 x L x B x D) / 100.

For a sailing boat with keel, Gross Tonnage = (.375 * L * B * D) / 100

For freighters with angled or cylindrical hulls, Gross Tonnage = (.67 * L * B * D) / 100

For ships with square barge-shaped hulls, Gross Tonnage = (.84 * L * B * D) / 100**

For a boat with a simple sailing hull, Gross Tonnage (GT) = (.5 x L x B x D) / 100**

Vessel Gross Tonnage Calculator

And 500 GT = 200 GRT. See also 46 CFR 11.211(h) .

Where does it state you can use these formulas to calculate Gross Registered Tonnage for the CG 719S?

You’re making this harder than it needs to be. If the vessel is only measured in GT you don’t need GRT See the link I posted above.

Thank you again. I like idea to simplify and not complicate the issue.

However, I have for years used 46 CFR 69.209 and the Simplified Measurement Tonnage Guide 1 for my calculations for the 719S form.

Many years ago, I was referred to the Gross Register Tonnage regulation of small vessel calculations if it was unknown.

Thanks for all of the great information. So if I am working an a vessel that’s only calculated with the simplified tonnage, how does this type of Vessel Gross Tonnage work when looking to upgrade your license when the Sea Service for the vessels needs to be in Gross Registered Tonnage? I attached a picture of the specs on the vessel along with a license checkoff list. Thanks for all of your help.

I like Mr Cavo’s method.

If this is for other purposes then I would use the vessel’s name and enter the CGMIX Coast Guard Port State Information Exchange

Last resort: Vessel Gross Tonnage Calculator or by formula 46 CFR 12.603 .

77.8’ x 20.7’ x 10.3’ x .67/100 = 111.14 tons

Thanks for the information. Would the 137 Gross Tons vessel I work on satisfy a Sea Service requirement that’s calling for time on vessels of 100 GRT or more? Thanks again.

This boat I work on is US Flagged.

I recommend looking at the GRT vs gt, Professional Mariner Forum Dec 2013 thread and Mr. Cavo’s post regarding the relationship between the two.

Thanks for the information jdcalvo. What is the National Maritime Center going to consider a 137 Gross Tonnage vessel to be for Gross Registered Tons?

Looking at the CG-719S form, it asks to list “Vessel Gross Tons”. I will put the 137 Gross Tons and will see what happens. See attached.

Seems that following Cavo’s guidance we both found our solution.

The “SIMPLIFIED MEASUREMENT GROSS TONNAGE” formulas?

The formulas I provided earlier were based on both the CFR and Simplified Measurement Gross Tonnage Guide to comply with the guidance for filling out the 719S form found in Documenting Sea Service on the NMC website. Based on my reading NMC is calculating Gross Tons as GRT. I believe that they will calculate for you given the Length, Beam and Draft based on the vessel type.

Let me know how you read the guidance.

Sorry for the run on sentence.

2 posts were split to a new topic: GRT/NRT has been replaced by GT/NT in all international trade since 1982

Your entire comment is completely irrelevant and off topic.

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Boat of the Week: This Newly Renovated 345-Foot Gigayacht Has a Pool That Turns Into a Dance Floor

Twenty-two years after its delivery, the oceanco h3 returned to its original shipyard to get a 33-foot hull stretch, updated profile, and brand-new interior. we step on board., julia zaltzman, julia zaltzman's most recent stories.

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The first thing that catches the eye is a large waterfall at the stern, spilling over from the 23-foot-long main-deck infinity pool. It’s a theatrical nod to the yacht’s exterior transformation, which saw 26 feet added to the steel hull at the stern and seven feet to the forward deck line. The extra length accommodates the owner’s request for a large pool aft that is designed with a raising dance floor. It also gives the vessel, originally launched in 2000 as  Al Mirqab , a sleeker, more modern profile. The next owner, F1’s Force India boss and now fugitive Vijay Mallya, renamed it Indian Empress . He was known for throwing extravagant parties aboard.

“The yacht was very boxy before, so we cut the entire superstructure off and rebuilt it to be as sleek as possible,” Jonathan Bevan, Reymond Langton’s exterior designer, tells Robb Report . Bevan also designed H3 ’s two “mini-me” Compass tenders—a 36-foot limousine and 34-foot open sportboat—that look like the mothership.

The owner’s deck and upper-deck aft areas—once used to host large parties for the opening night of the Monaco Grand Prix—have both been reduced in length. Coupled with a new enclosed gym on the sun deck, it gives the profile a more balanced look.

Bevan also eschewed straight lines in favor of contoured bulwarks that run the length of the yacht. “We’ve added a rolling-wave undercut that reflects the surface of the sea below and gives a sense of motion when the boat is moving,” he says.

Another noteworthy feature is the 33-foot-long video corridor. It links the welcome lounge and bar with the main salon, as well as concealing the tender bays on either side. On our tour, a floor-to-ceiling aquarium was displayed, but it can be used for all types of media, from videos to artwork. In the welcome lounge, an LED screen or “tech window” is linked to a camera pointing outside to give guests the choice between a virtual view or normal TV.

The interior has been taken back to the bare skin and designed anew. “A refit of this scale has not been done before. We wanted to create something dramatic and unrecognizable that can be enjoyed by family as well as for entertaining,” Reymond Langton’s interior designer, Elizabeth Kozlova, tells Robb Report .

Custom art runs throughout the yacht, including leather wall panels by Helen Amy Murray, woven metal by Sophie Mallebranche and decorative glass by Bernard Pictet. A palette of ivory and taupe tones combines with fiddleback sycamore, light oak, soft nubucks, and Foglizzo leathers that contrast with bronze and nickel detailing. The en suites and day heads are dressed in light marbles, such as Calacatta Vagli, Crema Delicato, and backlit quartz.

In the main foyer, a round Bianco Lasa marble floor frames a glass elevator that runs from the main deck to the bridge deck. The dedicated owner’s deck has a full-beam stateroom with walk-in wardrobes and an en suite. A private beauty salon and a study can be used as two additional guest cabins. The owner’s lounge has sofas, casual dining for 14, three Lasvit glass chandeliers, and two backlit infinity mirrors on the same level.

The yacht’s gross tonnage increased from 3,045GT to 3,521GT during the rebuild, which gave the designers more room to play with in an already high-volume vessel. They responded with high ceilings, more accommodation to sleep the 32 crew, and a full-beam VIP that serves as a second master, with private use of the bridge deck aft. Six guest cabins on the main deck bring total guest accommodations up to 20. On the lower deck is a destination spa with a hammam and sensory shower, a hair salon, and massage and beauty rooms.

Powered by triple, military-spec MTU 20V 1163 TB93 diesel engines for a massive 30,000 combined horsepower, H3 hit 30 knots during sea trials. That’s an impressive top end for a yacht this size, but then again, everything else about the new H3 is extraordinary.

Click here to see more images of H3.

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Albanian prosecutors order arrest of tourist town mayor for alleged corruption

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Albanian prosecutors said Saturday they ordered the arrest of the mayor of a seaside tourist town in the country’s south on corruption charges.

The Special Court Against Corruption and Organized Crime, which handles cases involving senior officials, ordered the arrest of Jorgo Goro, the mayor of Himare. He was charged with abuse of power for allegedly creating fake documents to obtain government land for a former member of parliament who planned to build a private tourist resort there.

Another person was arrested and three other officials with the Himare and Vlore municipalities were placed under house arrest. The five face up to seven years in prison if found guilty.

There was no immediate comment from Goro or his lawyer Saturday.

Goro had been accused by imprisoned politician Dhionisios Alfred Beleri of producing the fake documents regarding the 5,512 square-meter (6,592 square-yard) property for the resort.

Himare, 220 kilometers (140 miles) southwest of the capital Tirana, is a main tourist attraction in Albania’s Riviera.

Some 10 million tourists visited the tiny Western Balkan country last year, their spending accounting for about a fifth of the country’s gross domestic product.

Follow Llazar Semini at https://x.com/lsemini

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