Wednesday, January 21, 2026

Top 10 yacht racers pioneers


On December 17th 2013 a true legend of the Whitbread Round the World Race
crossed the final finish line.
He was a pioneer of the sport and the only person to win the race twice as a Skipper.

From YBW   

YBW's list of the top 10 yacht pioneers in the last 100 years.
Who do you think should be on the list?
We would love to hear your suggestions. 

In no particular order, here is YBW’s list of the pioneers who had a huge impact on yachting over the last century.
From record breakers to those who inspired a generation of sailors, these are the men and women who showed incredible determination to achieve their goals.

Tweet us @ybw with your suggestions if your favourite pioneer isn’t on our list!


Éric Tabarly


Éric Tabarly, along with his series of Pen Duick yachts, dominated ocean racing for decades.
The French Naval officer’s original Pen Duick was the family-owned Yum, a William Fife designed gaff-rigged cutter.
Tabarly renamed and refitted the vessel, rebuilding Pen Duick with polyester resin during the 1950s.
But, it was his racing on the 44-foot Pen Duick II which gave Tabarly his legendary status.
In 1964, he took his custom-built light displacement ketch and entered it into the Observer Single-handed Transatlantic Race (OSTAR), beating the winner of the race’s first edition, and favourite- Sir Francis Chichester.
For beating the British at their own challenge, Tabarly was awarded France’s Legion D’Honneur. He also received the Blue Water Medal.
His victory in 27 days, 3 hours and 56 minutes led to the popularity of sailing in France.
He also nurtured the likes of Alain Colas, Marc Pajot and Olivier de Kersauson, ensuring France’s racing legacy continued.
Success continued for Tarbarly, with wins in the Sydney Hobart and the Fastnet Race in 1967 on the aluminium Pen Duick III.
He took line honours in the 1969 Transpac on his trimaran, Pen Duick IV, as well as setting a new course record.
In 1976, he again won the OSTAR in his André Mauric designed 22-metre ketch, Pen Duick VI.
This edition of the race was particularly tough, with two major depressions forcing a record 50 retirements.
In 1980, he set the transatlantic sailing record from West to East (New York-The Lizard), on the multihull, Paul Ricard.
He did it in 10 days 5 hours 14 minutes and 20 seconds, beating the previous record which was set in 1905.
Tabarly raced in two Whitbread Round the World Races – the first edition in 1973 and in 1994.
In 1997, he won the Fastnet Race with Yves Parlier on Aquitaine Innovations.
Tabarly died in June 1998, when he was knocked overboard and drowned in the Irish Sea.
He was sailing the original Pen Duick to Scotland as part of the boat’s centenary celebrations.
His home nation mourned, but his legacy has lived on.
French skippers continue to dominate ocean racing today.


Vito Dumas


While nations battled in World War Two, Argentinian single-handed sailor, Vito Dumas set out to circumnavigate the Southern Ocean.
He left Buenos Aires in June 1942 on board his 32-foot Colin Archer ketch, LEHG II with only basic gear on board. He didn’t even have a radio because of fears he might be shot as a spy.
During the voyage through the “Roaring Forties”, he only made three landfalls at Cape Town, New Zealand and Valparaiso, Chile.
At times he was so cold, he had to stuff his clothes with newspaper to keep warm.
Dumas arrived back in Buenos Aires on 8 August 8 1943, 437 days after he set off.
Thousands turned out to greet the man who had become the first solo sailor to round Cape Horn and the first to sail around the world with only three landfalls.
Dumas wrote about the experience in his book Los Cuarenta Bramadores: La Vuelta al Mundo Por la “Ruta Imposible” (Alone Through The Roaring Forties).
Afterwards LEGH II was donated to the Argentine navy. It was later wrecked and then restored before being given to the Museo Naval de la Nacion (Naval Museum of the Nation) at Tigre.
Prior to his Southern Ocean adventure, Dumas had sailed, single-handed, from France to Argentina, in his 26-foot LEGH I, named using the initials of each of his four mistresses’ names at the time.
He left Arcachon in December 1931, arriving after 121 days at the Yacht Club Argentino in Buenos Aires.
The Argentinian skipper was also the first recipient of the Slocum Award in 1956, named in honour of Captain Joshua Slocum.
Dumas was given the award not only for his Southern Ocean feat and his 1931-2 single-handed voyage from France to Argentina, but for his single-handed voyage from Argentina to the United States of America via Bermuda in SIRO in 1956.
Dumas later received the Diploma of Merit of the Konex Awards from his home country. He died of a stroke in 1965.
His sailing legacy lives on through his books which include My Trips, Solo, toward the Southern Cross and The Cruise of the Unexpected.


Bernard Moitessier

The “free spirit” of sailing, Bernard Moitessier surprised some in the sailing community when he decided to quit the 1968-69 Sunday Times Golden Globe Race, despite being in front.
The Frenchman had the fastest circumnavigation time, but rather than continue back to England to fame and £5,000, he decided to continue sailing on his 39-foot ketch, Joshua.
He didn’t stop until June 1969 when he made landfall in Tahiti, setting the record for the longest nonstop passage by a yacht – 37,455 nautical miles in 10 months.
Moitessier later wrote about this experiences in La Longue Route; seul entre mers et ciels (The Long Way). 
The book has become a classic, outlining Moitessier’s technique for heavy weather sailing.
Born and raised in Vietnam, Moitessier was already something of a sailing legend before the Golden Globe Race.
In 1966, he and his first wife, Françoise returned to France having initially set out with the intention of circumnavigating on Joshua.
Running out of time, Moitessier had decided to sail to France from Tahiti via Cape Horn, rather than taking the longer route via the Indian Ocean.
During this “logical route”, Moitessier drew heavily on the experiences and techniques of Argentinian sailor, Vito Dumas; he had a copy of Dumas’s book Los Cuarenta Bramadores: La Vuelta al Mundo Por la “Ruta Imposible” (Alone Through The Roaring Forties) on board.
When the couple arrived home they discovered, unintentionally, that they had completed the longest nonstop passage by a yacht in history—14,216 nautical miles, over 126 days.
Moitessier’s book, Cap Horn à la voile: 14216 milles sans escale (Cape Horn: The Logical Route) recounts the voyage and was, again, an instant success.
Moitessier continued travelling before he settled in Paris to write his autobiography, Voile, Mers Lointaines, Iles et Lagons (A Sea Vagabond’s World).
His earlier adventures on board his junk Marie-Thérèse and subsequent yacht, Marie-Thérèse II, which he sailed from Indonesia to the Caribbean, were recorded in Un Vagabond des mers du sud (Sailing to the Reefs). The book was published in 1960, and first brought Moitessier to the attention of the world’s sailing community.
He died in June 1994 and is buried in Bono in Brittany, France.


Sir Francis Chichester


Sir Francis Chichester was already an acclaimed aviator and navigator when he made his mark on the sailing world.
The Devon-born sailor is best remembered for his 1966-67 circumnavigation on board his yawl, Gipsy Moth IV, for which he was knighted.
His long-distance sailing career began after his recovery from lung cancer, with the first Observer Single-handed Transatlantic Race (OSTAR) in 1960.
The revolutionary race was founded by Blondie Hassler.
Chichester entered and won in his 40-foot yacht, Gipsy Moth III, completing the route from Plymouth to New York City in 40 days, 12 hours and 30 minutes.
Four years later he came second, beaten by French skipper, Éric Tabarly.
Chichester then focussed on what was considered at the time an unimaginable feat of seamanship.
The 65-year-old skipper set sail from Plymouth in his Camper & Nicholson built Gipsy Moth IV to try and beat the passage times of the clipper ships.
He returned to Plymouth on 28 May 1967, having circumnavigated the globe, with one stop in Sydney, in 226 days.
Chichester became a hero – the first person to achieve a true circumnavigation of the world, solo, from West to East, via the great Capes.
The voyage captured the public’s imagination, and over 250,000 people turned out to see him arrive.
The event was globally televised, and Chichester, along with Gipsy Moth IV became famous around the world.
Chichester was knighted for his feat; the sword used in the ceremony had belonged to Sir Francis Drake, himself a notable sea captain and navigator who carried out the second ever circumnavigation around the world.
Chichester was also put on the newly issued 1/9d stamp, the first living non-royal to appear on one.
Two years after his circumnavigation, Chichester, in Gipsy Moth V attempted to sail 4,000 miles in 20 days, but failed by one day.
He died in Plymouth in August 1972, but left a body of work including Gipsy Moth Circles the World, Alone Across the Atlantic and The Romantic Challenge.
Gipsy Moth IV, after decades of neglect, was eventually restored following a campaign by Yachting Monthly and the United Kingdom Sailing Academy.
It went on to circumnavigate the world again via the trade wind route and the Panama and Suez Canals, arriving back in Plymouth on 28 May 2007.

James Wharram

 
James Wharram is considered the inventor of the modern day catamaran.
Using his research into ancient Polynesian boat design, he designed and built the first offshore catamaran in Britain, the 23-foot Tangaroa.
At the time, many in the global yachting community dismissed the idea that such a design could be seaworthy.
But Wharram, who was inspired by the journey of Frenchman Eric de Bisschop, who sailed a double canoe from Hawaii to France in 1939, proved them wrong.
In 1955-56, he sailed his “double hulled canoe” from Falmouth, Cornwall to the West Indies with two German girls, Ruth Merseburger (later Wharram) and Jutta Schultze-Rohnhof.
In Trinidad, he built the second 40-foot Polynesia style catamaran, Rongo, with the help of Bernard Moitessier and his friend, Harry Wakelam.
Wharram, Merseburger and Schultze-Rohnhof then continued their voyage, sailing from Trinidad to New York, and then across the Atlantic to Ireland.
They were the first to sail a catamaran west to east across the North Atlantic.
This, and the subsequent book, Two Girls, Two Catamarans, secured Wharram’s place in yachting history.
Wharram, who is now 88, is still designing, building and sailing offshore catamarans from his base in Devoran, Cornwall.
He is one of the most successful multihull designers in the world, having sold more than 10,000 plans for his Wharram self-build catamarans.
Ruth Wharram was also a key part of the design team.
He has worked closely with his co-designer Hanneke Boon, creating new building methods such as the lashed crossbeam connections and the Wharram Wingsail Rig.
In 1994-98, Wharram and his partners sailed their flagship, the 63-foot catamaran, Spirit of Gaia into the Pacific and round the world.
Their voyage was to study Indo-Pacific canoe design. Spirit of Gaia is currently being renovated in Greece.
In 2008-9, 50 years after his pioneering Trans-Atlantic crossings, Wharram and Boon sailed in the Lapita Voyage expedition.
The trip, which was conceived by them and the German maritime author, Klaus Hympendahl, followed the ancient migration route into the Pacific.
In two Tama Moana double canoes, designed by Wharram, the crew sailed around 4,000 nautical miles from the Philippines to Tikopia and Anuta in the Solomon Islands.
The boats were subsequently donated to the islands for future transport use.
The voyage was compared to Thor Heyerdahl’s voyage of the Kon-Tiki, in which the Norwegian attempted to prove the Polynesians migrated into the Pacific from South America.


Eric & Susan Hiscock


Few sailors start ocean cruising without at least one of Eric Hiscock’s books on board.
Together with his crew, wife Susan, he chronicled his sailing adventures and wrote technical books including Cruising Under Sail and Voyaging Under Sail.
Hiscock and his wife were one of the few people in the 1950s cruising the world for pleasure on small sail boats.
They were the world’s most famous cruising couple of their day.
Their first circumnavigation was on board the now legendary Wanderer III between 1952-1955.
The subsequent book, Around the World in Wanderer III, was popular, and sparked a series of books about their later voyages on board the 30 foot Laurant Giles sloop, as well as their other vessels Wanderer IV and Wanderer V.
Hiscock was the first recipient of the Yachtsman of the Year award in 1955.
He was presented with the ‘Knighthood of Yachting’ for his three-year circumnavigation with Susan in Wanderer III.
This sloop is the only vessel to have won America’s Blue Water Medal under both sets of owners.
It is presented for “meritorious seamanship and adventure upon the sea displayed by amateur sailors of all nationalities, that might otherwise go unrecognized.”
Hiscock died on board Wanderer V in Whangarei, New Zealand in 1986.
Susan Hiscock continued for several years sailing solo in Wanderer V before returning to Yarmouth, Isle of Wight.
She bought an 11-foot scow, and apparently won her first-ever race at Yarmouth Sailing Club, aged 80. Susan died in 1995.
 
 
Tracy Edwards
 

A trailblazer for women sailors, Tracy Edwards skippered the first all-female crew in the 1989-90 Whitbread Round the World Yacht Race.
Her 12 crew on board the 58-foot yacht, Maiden defied the critics by winning two legs and finishing second in its class, the best performances in the race by a British boat since 1977.
Edwards had never really sailed until she landed a job as a stewardess on board a motor yacht in Greece when she was 16.
Her boyfriend had taken part in a Whitbread race which inspired her to do the same.
She initially sailed on Norsk Data GB before joining the crew of the Atlantic Privateer for the 1985-86 Whitbread – the only woman on board.
Edwards realised that of the 200 crew members in the race, only five were women. This inspired her, at the age of 27, to enter the Maiden crew for the 1989-90 Whitbread, despite the hostility she received.
She was awarded an MBE and became the first woman to be voted ‘Yachtsman of the Year’ by the Yachting Journalists’ Association.
In 1998 Edwards assembled an all-female crew for the 1998 Jules Verne trophy.
The crew were on course to break the record for the fastest circumnavigation of the world with no stopping and no outside assistance when they hit storms off the coast of Chile.
The mast of their 92 foot catamaran, Royal and SunAlliance, broke in the storm ending their attempt. It took the crew 16 days to reach the shore, and Edwards has said that she will always be proud that they didn’t need rescuing.
Edwards has since retired from sailing and is now a motivational speaker.
She launched a campaign to save Maiden in 2006 after discovering it was rotting in a marina in the Indian Ocean.
It has been restored in Cape Town, South Africa, and fundraising is underway to bring the yacht back to the UK.


Sir Robin Knox-Johnston

 
A legend in his own lifetime, Sir Robin Knox-Johnston first shot to fame after he became the first person to sail single handed and non-stop around the world.
He was the only entrant in the Sunday Times Golden Globe Race to complete the challenge on 22 April 1969 on board his 32-foot Bermuda ketch, Suhaili.
In recognition of his achievement, he was created a Commander of the Most Excellent Order of the British Empire (CBE).
A former Merchant Navy officer, Knox-Johnston, had previously sailed Suhaili from Bombay, India to the UK via Arabia and the Cape of Good Hope in 1965-7.
In 1969, Knox-Johnston and Leslie Williams bought the 71-foot ketch, Ocean Spirit. At the time, the Ocean 71 hull was the largest GRP boat ever moulded.
They entered the 1970 Round Britain Race and won it by two days – the only time the race has been won by a monohull.
Knox-Johnston repeated this success in 1974, this time with Gerry Boxall on the Rod Macalpine-Downie designed catamaran, British Oxygen.
Ocean Spirit, crewed by Knox-Johnston, Williams and the late Sir Peter Blake, went on to take line honours in the inaugural Cape Town to Rio Race in 1971.
Knox-Johnston, Williams and Blake reunited again for the 1977-78 Whitbread Round the World Race.
Knox-Johnston skippered the 77-foot, John Sharp-designed maxi sloop, Condor to line honours in two legs.
Blake would later win the 1989–90 Whitbread race, skippering Steinlager 2 to an unprecedented clean sweep of line, handicap and overall honours on each of the race’s six legs.
In 1994, Knox-Johnston and Blake co-skippered the remodelled Nigel Irens designed catamaran, Enza New Zealand to take the Jules Verne Trophy for the fastest circumnavigation of the world.
They did it in 74 days 22 hours 18 minutes, and set a new world record.
In 1995, Knox-Johnston was knighted, and the following year established the Clipper Around the World Yacht race, opening the sport to novice sailors.
In 2006/07, to prove that age was no barrier, Knox-Johnston entered the VELUX 5 Ocean Race.
At 68, he was the oldest competitor in the race.
On 4 May 2007, he defied the critics by completing his second solo circumnavigation of the world in the Open 60 Fila, SAGA Insurance. Overall, he finished 4th place in the VELUX.
Over the last five decades, Knox-Johnston has been honoured for his contribution to global sailing and racing.
He has been named UK Yachtsman of the Year four times.
In 2010, he was awarded the Cruising Club of America’s Blue Water Medal for the advancement of sailing, sail training and youth development.
Knox-Johnson has also received the Royal Cruising Club Seamanship Medal, Silk Cut Nautical award Seamanship Trophy, the Royal Institute of Navigation’s Gold Medal for experiments with renaissance navigation and The Maritime Trust’s Cutty Sark Medal, to name just a few.
On 1994, the ISAF named him as World Sailor of the Year, and in 2008 he entered the ISAF Hall of Fame.
He is also a past president of the Sail Training Association, has been elected a Younger Brother of Trinity House, is a Freeman of the City of London and was elected president of the Little Ship Club in 1995.


Dame Naomi James

 
Dame Naomi James made history on the 8 June 1978, when she sailed into Dartmouth on board her storm-battered sloop, Express Crusader.
Not only was she the first woman to have sailed single-handed around the world via Cape Horn, but she had also done it in 272 days.
This beat Sir Francis Chichester’s round-the-world sailing record by two days.
Quite a feat for the 29-year-old who had only learnt to sail three years earlier, and had only learnt to swim at the age of 23.
James was initially an unlikely sailor, growing up on a sheep farm in New Zealand.
She decided to sail to Europe in search of adventure and in St Malo, France in the summer of 1975 met her future husband Rob James. At the time he was skippering yachts for Chay Blyth.
As their relationship blossomed, so did James’ sea legs and she decided, with the backing of her husband, to attempt the circumnavigation.
Blyth even lent her his boat, the Spirit of Cutty Sark, which was later renamed Express Crusader.
In later interviews, James admitted her sailing skills were far from perfect, but she pushed on, even when faced with damage to her yacht’s rigging and a knockdown in a storm.
Dame Naomi and her husband went on to win the 1982 Around Britain Race on board their catamaran, Colt Cars.
She hasn’t sailed since.
In March 1983, Rob James, 36, died in Salcombe Harbour when he fell into the sea from Colt Cars. He had been moving the boat from Cowes to Salcombe.
Dame Naomi currently lives in Ireland and has written several books including At One with the Sea: Alone Around The World and At Sea on Land.

David Lewis

At the age of 55, Dr David Lewis set sail on his 32 foot steel cutter, Ice Bird with the aim of circumnavigating the Antarctic continent.
At the time, no one was known to have sailed solo to Antarctica.
He left Sydney, Australia on 19 October 1972.
Just over 14 weeks later, Lewis, with frost-bitten hands and a nearly wrecked Ice Bird, limped into the American Antarctic base.
Lewis had capsized three times and been dismasted twice in hurricane-force storms. He had sailed the last 2,500 nautical miles under jury rig.
He described the incredible voyage in his memoirs, Shapes of the Wind – a fascinating account of a sailor pushed to the very edge of endurance in some of the most inhospitable seas on earth.
Lewis, who was born in Plymouth, never completed his circumnavigation of the continent.
He left Ice Bird at Palmer while he accepted an invitation from National Geographic to write about his expertise ancient Polynesian navigation.
In his absence, Ice Bird has been repaired and eight months later he set sail from Palmer station, getting caught in a heavy ice field. After again capsizing, he abandoned the voyage and made landfall in Cape Town.
His book, Ice Bird, recounts the vessel’s trip. Ice Bird was eventually sailed back to Sydney and was donated to the Powerhouse Museum.
Lewis’ studies on the traditional systems of navigation used by the Polynesians was one of his lasting legacies, and are documented in his book, We, the Navigators.
He used these methods while sailing around the world on Rehu Moana with this family in the 1960s. This was the first catamaran to complete a circumnavigation of the world.
Lewis was also one of the skippers to enter the first Observer Single-handed Transatlantic Race (OSTAR) in 1960, which was won by Sir Francis Chichester.
He came third after repairs to Cardinal Vertue lost him two days of racing, which are recounted in the book, The Ship Would Not Sail Due West.
Lewis received many awards. These included Australian Geographic magazine’s Adventurer of the Year in 1998, the Gold Medal of the Royal Institute of Navigation and the Bernard Fergusson Trophy as New Zealand’s Yachtsman of the Year 1965.



Tuesday, January 20, 2026

Germany (BSH) layer update based on ENC in the GeoGarage platform

 
227 charts updated and 10 added

from-s57-to-s-100-charting-a-smarter-future-for-shipping/

 

 Source: By Tom Mellor, Head of Technical Partnerships, The UK Hydrographic Office

When the International Hydrographic Organisation (IHO) introduced S-57 in 1992, it marked a milestone in maritime history. For the first time, the industry had a unified standard for hydrographic data, laying the foundations for Electronic Navigational Charts (ENCs) and enabling safer, more efficient international trade.

More than 30 years later, the maritime community is preparing for another significant transition: the introduction of S-100, the IHO’s next-generation data framework.

With S-100 compliant products expected to enter the market from 2026, this shift could unlock new possibilities for smarter, safer and more sustainable shipping.

  • What is S-57?

S-57 is the current IHO standard used for the exchange of digital hydrographic data.

It enabled the creation of ENCs and brought global consistency to how data such as water depths, coastline features and navigational hazards are captured and displayed.

This standardisation has helped mariners to operate safely and confidently across international waters, regardless of the vessel’s flag or region.
However, S-57 was designed in an era before modern data demands.

It is optimised for static chart display and does not support the dynamic, layered information increasingly required by today’s digital bridges.

  • What is S-100 – and why does it matter?

S-100 is a flexible, extensible data framework designed to support the future of navigation.

Unlike S-57, which supports only ENCs, the S-100 framework can accommodate a wide variety of data types.

These will be made available through compatible display systems such as an Electronic Chart Display and Information System (ECDIS), giving mariners richer situational awareness and supporting better decision-making.

Some of the types of data being developed under S-100 include:

  • S-101: Electronic Navigational Chart: The successor to S-57 ENCs, S-101 forms the core of S-100’s chart display and provides the foundation to integrate additional layers of information.
  • S-102 Bathymetric Surface: Offers a high-resolution bathymetric model of the seafloor and detailed depth data, essential for precision navigation in ports and other constrained waterways.
  • S-104 Water Height: Provides real-time and predictable tidal data, enhancing safety and fuel efficiency.
  • S-111 Surface Currents: Supplies information on current flow and direction, improving route optimisation.
  • S-122 Marine Protected Areas: Contains details on boundaries and regulations for environmentally sensitive zones.

Further datasets are also in development or under consideration as part of the S-100 series, including weather and ice information, reflecting the growing need for richer, real-time environmental data.

As industry needs evolve, additional specifications may be added to support future navigation technologies.

  • Supporting the next era of maritime operations

When used together, these datasets could transform how mariners plan and execute voyages.

For example, when S-104 tidal predictions are combined with S-102 bathymetric surfaces and displayed on S-101 charts, mariners can calculate dynamic under-keel clearance (DUKC) – factoring in changing tidal heights over time.

This can help ships maximise cargo while maintaining safe clearance in shallow or constrained waters.

The commercial impact can be significant. For every additional 10cm of water identified through accurate S-100 data, a terminal may be able to load around 100 extra containers, potentially representing hundreds of thousands of dollars in added cargo value per vessel.

By bringing together both visible and previously inaccessible data in a machine-readable format, S-100 could also support greater automation and smarter voyage planning.

In contrast to S-57, which relies on mariners interpreting charted features alongside separate sources for real-time conditions, S-100 is designed to bring these insights together.

This could enable functions such as real-time safety contour updates, integration with onboard AI systems, and optimised routing based on tides, currents, and protected areas; ultimately supporting industry ambitions around decarbonisation and digital transformation.

  • Preparing for the transition

The shift to S-100 is already underway.

From 2026, the first S-100 compliant products are expected to be available, with a transition period anticipated through to 2029.

From that point, new ECDIS systems installed on ships will be required to support the S-100 framework in line with IMO regulations.

To ensure smooth and effective rollout, early engagement is essential.

Hydrographic offices, technology providers, and training institutions all have a role to play in preparing the industry – both in producing these new datasets and ensuring end users are ready to benefit from them.

Just as S-57 once set the course for modern digital navigation, S-100 will shape the next generation of navigational data; offering a broader, richer view of the maritime environment and paving the way for smarter, safer, and more sustainable shipping. 

Links :

 

Monday, January 19, 2026

Netherlands (NLHO) layer update based on ENC in the GeoGarage platform

126 charts updated & 3 cherts added
 

Satellite captures the first detailed look at a massive tsunami

Image Credit: NOAA
 
From Earth by Andrei Ionescu

When a magnitude 8.8 earthquake ripped through the Kuril-Kamchatka subduction zone on July 29, 2025, it launched a Pacific-wide tsunami – and a rare natural experiment.

NASA and the French space agency’s SWOT satellite happened to pass overhead.
The satellite captured the first high-resolution, spaceborne swath of a great subduction-zone tsunami.

Instead of a single neat crest racing across the basin, the image revealed a complicated, braided pattern of energy dispersing and scattering over hundreds of miles.
These are details that traditional instruments almost never resolve.

The results go well beyond a pretty picture.
They suggest the physics we use to forecast tsunami hazards – especially the assumption that the largest ocean-crossing waves travel as largely “non-dispersive” packets – need a revision.

Satellites transform tsunami mapping

Until now, deep-ocean DART buoys have been our best open-ocean sentinels: exquisitely sensitive, but sparse, each giving a time series at a single point.

SWOT maps a 75-mile-wide swath of sea surface height in one pass.
This lets scientists see the tsunami’s geometry evolve in both space and time.

“I think of SWOT data as a new pair of glasses,” said study lead author Angel Ruiz-Angulo of the University of Iceland. “Before, with DARTs we could only see the tsunami at specific points in the vastness of the ocean.”

“There have been other satellites before, but they only see a thin line across a tsunami in the best-case scenario. Now, with SWOT, we can capture a swath up to about 120 kilometers (75 miles) wide, with unprecedented high-resolution data of the sea surface.”

From eddies to a tsunami

NASA and the French space agency CNES launched SWOT in December 2022 to survey surface water around the world.

Ruiz-Angulo and co-author Charly de Marez had been poring over its data for ocean eddies when the Kamchatka event hit. 
“We had been analyzing SWOT data for over two years understanding different processes in the ocean like small eddies, never imagining that we would be fortunate enough to capture a tsunami,” noted the researchers.

Tsunami behavior breaks rules

Classic teaching holds that big, basin-spanning tsunamis behave as shallow-water waves.
Their wavelength dwarfs ocean depth, so they march along without breaking into separate components.

SWOT’s snapshot argues otherwise for this event. 
“The SWOT data for this event has challenged the idea of big tsunamis being non-dispersive,” said Ruiz-Angulo.

When the team ran numerical models that included dispersive effects, the simulated wave field matched the satellite pattern far better than “non-dispersive” runs.

That matters because dispersion repackages the wave train’s energy as it approaches land. “The main impact that this observation has for tsunami modelers is that we are missing something in the models we used to run,” said Ruiz-Angulo.

“This ‘extra’ variability could represent that the main wave could be modulated by the trailing waves as it approaches some coast. We would need to quantify this excess of dispersive energy and evaluate if it has an impact that was not considered before.”

Blending every clue available


SWOT’s swath told scientists what the wave looked like mid-ocean.
DART buoys anchored the timing and amplitude at key points.

Two gauges didn’t line up with tsunami predictions from earlier seismic and geodetic source models – one recorded the waves earlier than expected, and the other recorded them later.

Using an inversion that assimilated the DART records, the researchers revised the rupture.
It extended farther south and spanned roughly 249 miles (400 kilometers), not the 186 miles (300 kilometers) that many initial models assumed.

“Ever since the 2011 magnitude 9.0 Tohoku-oki earthquake in Japan, we realized that the tsunami data had really valuable information for constraining shallow slip,” said study co-author Diego Melgar. Folding that information in isn’t yet routine.

As Melgar argued, this is because the hydrodynamic models needed to model DARTs are very different from the seismic wave propagation ones for modeling the solid Earth data.

“But, as shown here again, it is really important we mix as many types of data as possible.”

Old quakes guide new warnings

The Kuril–Kamchatka margin has a history of producing ocean-wide tsunamis.
A magnitude 9.0 quake in 1952 helped motivate the Pacific’s international alert system, which issued basin-scale warnings during the 2025 event.

SWOT’s pass adds a new kind of evidence to that warning toolbox.
With enough luck and coordination, scientists could use similar swaths to validate and improve real-time models.

This will be especially important if dispersion turns out to shape near-coast impacts more than we thought.

“With some luck, maybe one day results like ours can be used to justify why these satellite observations are needed for real or near-real time forecasting,” Ruiz-Angulo said.

A turning point for tsunami forecasts


Three takeaways emerge.
First, high-resolution satellite altimetry can see the internal structure of a tsunami in mid-ocean, not just its presence.

Second, researchers now argue that dispersion – often downplayed for great events – may shape how energy spreads into leading and trailing waves, which could alter run-up timing and the force on harbor structures.

Third, combining satellite swaths, DART time series, seismic records, and geodetic deformation gives a more faithful picture of the source and its evolution along strike.

For tsunami modelers and hazard planners, the message is equal parts caution and opportunity.

The physics now has to catch up with the complexity that SWOT has revealed, and planners need forecasting systems that can merge every available data stream.
The waves won’t get any simpler – but our predictions can get a lot sharper.

The study is published in the journal The Seismic Record.

Sunday, January 18, 2026

Friday, January 16, 2026

U.S. added over one million square kilometers to its territory, what may come next?

U.S. Extended Continental Shelf Regions.
see State.gov 

From Earth.com by Eric Ralls

The United States successfully claimed an additional one million square kilometers beneath the ocean, expanding its Extended Continental Shelf (ECS) boundaries.

Yes, it’s like America just bought a new basement, one that is almost 60% the size of Alaska.

Mead Treadwell, former lieutenant governor of Alaska and chair of the U.S. Arctic Research Commission, helps us understand the situation.

“America is larger than it was yesterday.
It’s not quite the Louisiana Purchase.
It’s not quite the purchase of Alaska, but the new area of land and subsurface resources under the land controlled by the United States is two Californias larger,” Treadwell explained.
 
 
The Extended Continental Shelf (ECS)

Picture the ocean like a multi-story building that starts at a country’s shoreline. International law gives coastal states clear rights out to 200 nautical miles.
That is the “main floor” of this hypothetical building.

The Extended Continental Shelf (ECS) is what comes next.
It covers the seabed and the rocks beneath it beyond that 200-nautical mile line.
This part of our hypothetical is more like the building’s underground levels than extra living space.

A country doesn’t gain new rights to the water column in that area, but it can claim rights to the resources in the seabed and subsoil if it can show the seafloor is a natural continuation of its land territory. 

Under the rules, a coastal state can set the outer edge of its continental shelf as far as 350 nautical miles from its baseline.

In some cases, it can go 100 nautical miles beyond the 2,500-meter isobath, which is a line that traces where the ocean is 2,500 meters deep, but only if the science supports it.

Legality of ECS claims

UNCLOS Article 76 provides the playbook for drawing the continental shelf beyond 200 nautical miles. It explains what evidence counts, how to use geology and seafloor shape to justify an outer limit, and which constraints cap how far the line can go.

The Commission on the Limits of the Continental Shelf (CLCS) acts as the technical referee.
It reviews a coastal state’s submission and checks whether the methods and data meet the standards.

The commission includes specialists in fields like geology, hydrography, and oceanography, because these claims rise or fall on the science.

Claiming an Extended Continental Shelf

A state can’t just point at a map and declare victory.
It has to build a case, document it, and defend it with evidence that holds up under expert scrutiny.

Coastal states start by collecting data through seafloor surveys.
They use tools like seismic profiling, sediment sampling, and detailed bathymetric mapping to show what the seabed looks like and how it connects to the country’s landmass.

After that, they assemble a formal submission.
This package typically includes charts, maps, coordinates, and technical reports that explain the data, the methodology, and the proposed outer limits.

Then the CLCS reviews the submission in depth.
The commission tests the scientific reasoning and may ask questions or request clarifications.
It ultimately issues recommendations.

Those recommendations don’t automatically settle political disputes, but they carry real authority because they reflect a thorough, expert-driven evaluation of the evidence.

Twenty years of hard work

The U.S. began its quest for an ECS back in 2003.
This effort, which required teamwork between the U.S. State Department, the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Geological Survey (USGS), was no easy task.

It took them twenty years and involved a massive data collection initiative, but it paid off, big time.
On December 19, 2023, the State Department announced new geographical coordinates of the U.S. ECS, adding massive chunks of territory in the Atlantic, Arctic, Pacific, and more.
 

The United States and UNCLOS

How might the U.S. attempt to use these rules to further expand the reach of U.S. territory under the Trump administration?

The relationship between the United States and the United Nations Convention on the Law of the Sea (UNCLOS) is complicated, to say the least.

While UNCLOS is often referred to as the “Constitution for the Oceans,” governing everything from maritime boundaries to resource rights and environmental standards, the U.S. has never actually ratified the treaty, even though it played a significant role in drafting it back in the 1970s and 1980s.

There are worries about issues like sovereignty, naval operations, and financial commitments that have created some major roadblocks. 

Some senators fear that joining the treaty would mean giving up U.S. rights to the International Seabed Authority and could restrict access for U.S. companies to underwater resources.

On the flip side, military leaders, especially from the U.S. Navy, are all for ratification, arguing that it would help the U.S. tackle excessive maritime claims by other countries and secure navigational freedoms.

Supporters of ratifying UNCLOS believe that joining would boost U.S. influence in shaping global maritime rules and give legal certainty for U.S. claims, especially regarding the Extended Continental Shelf (ECS).

Even though the U.S. isn’t a formal party, it already follows many of the convention’s rules, using its provisions to back up territorial claims and assert navigation rights in international waters, like the South China Sea.

Science of exploration

This ambitious venture required a scientific odyssey of epic proportions.
The areas encompassed in this claim include the Arctic, the east coast Atlantic, the Bering Sea, the west coast Pacific, the Mariana Islands, and two regions in the Gulf of Mexico.

Brian Van Pay, Project Director for the State Department, explained further, saying, “Forty missions at sea, going to areas that we’ve never explored before, finding entire seamounts we didn’t even know existed.”

Scientists spent the equivalent of over three years charting new territory; using sonar mapping, geological sampling, and sediment layer analysis.

The outcome, as Van Pay notes, was a submission that aligns with the 1982 United Nations Convention on the Law of the Sea (UNCLOS) — the legal framework for this claim. 

Importance of UNCLOS and ECS

The implications of this move are multifold.
For starters, the U.S. now has the right to control and potentially exploit resources like oil, gas, and minerals in the expanded territory.

However, it doesn’t mean they can suddenly start fishing further off the coast or start patrolling the new water regions.
It’s more like the U.S. government won the mineral rights to some underwater property.

The claim has been shaped carefully to avoid stepping on the toes of other nations, particularly Russia. But there might be a bit of an overlap with Canada, which may call for future diplomacy.

Despite the potential gains, challenges persist.
The biggest one of these, as mentioned above, is the lack of a formal ratification of UNCLOS by the U.S. Senate.
This gap could potentially limit the international legal weight of the claim.

Moreover, the claim’s validity is dependent on the robustness of the science backing it.

According to Treadwell, “If somebody came back and said, ‘Your science is bad,’ I think the United States would listen. But I don’t think science is bad. I think we’ve had very good science.”
 
Managing the Extended Continental Shelf

There’s more at stake than just economic gain.
The move also widens the U.S.’s jurisdiction to enforce environmental regulations effectively and protect fragile marine ecosystems from unchecked exploitation.

However, balancing these ecological responsibilities with economic interests will prove to be a tricky task. 

But, hey, isn’t that part of the thrill?
As over 75 countries have already defined their ECS boundaries, it’s clear that the world is entering a new era of ocean governance.

So, will this new territory lead to a scramble for resources, or will it enhance cooperation in managing and protecting the world’s oceans?
Let’s not get ahead of ourselves.
For now, America has made a bold move, and the rest of the world is watching.

One thing is for sure, though: how we navigate these waters will affect not only our economy but also the health of our oceans, the climate, and our future.
 
Links :

Thursday, January 15, 2026

Maps show why Greenland is so important as the Arctic warms

A fishing boat navigates around icebergs that broke off from the Jakobshavn Glacier and are floating in Disko Bay on March 10, 2025, in Ilulissat, Greenland.
Joe Raedle | Getty Images News | Getty Images

From CBS by Tucker Reals

President Trump has said repeatedly that he wants the United States to control Greenland, refusing to take military action off the table and declaring that he will make the semi-autonomous Danish territory part of the U.S. "one way or the other."


 
Mr. Trump says the U.S. needs to control the vast, largely frozen island that sits mostly inside the Arctic Circle for security reasons, accusing China and Russia of trying to take it over instead.

Greenland's own democratically elected leaders have rejected any U.S. takeover, with the island's government calling it something they "cannot accept under any circumstance."

There are a number of reasons why Greenland is of such intense interest to the Trump administration, including its natural resources — reserves of oil, natural gas and rare earth minerals.
 

But the physical location of the island on the map — and the sea ice melting around its borders — is also of vital importance.

New routes around the globe

Melting Arctic sea ice has created more opportunity to use northern shipping routes — allowing logistics companies to save millions of dollars in fuel by taking much shorter paths between Asia and Western Europe and the United States.
Northern routes were long only passable in warmer months.
 
 
CBS News

There are a couple primary routes through the Arctic becoming more viable, the Northern Sea Route (NSR), which follows Russia's roughly 15,000-mile northern border.
That path doesn't bring ships too close to Greenland, and Russia and China have agreed to develop the route together, and have been making greater use of it in recent years.

A Russian commercial vessel, aided by an icebreaker, first traversed the NSR in the winter in February 2021, proving it was possible.

The other route, called the Northwest Passage, comes much closer to Greenland's coastal waters and is more likely the path the Trump administration is concerned with.

The other, longstanding way to get goods from ports in Russia or the manufacturing powerhouses of East Asia is to go south. But that course, through Egypt's Suez Canal, is about 3,000 miles longer.
 

According to the Arctic Institute, compared to the Suez Canal route, the Northern Sea Route can save shippers as much as 50% in costs, considering fuel and other expenses, by reducing the distance from Japan to Europe, for instance, to only about 10 days compared to the roughly 22 it would take to sail around the southern tip of Africa and then through the Suez Canal.

A 2024 analysis by the Middlebury Institute of International Studiesalso said the northern route would shave about 10 days of a similar journey from Shanghai, China, to Rotterdam in the Netherlands.

As sea temperatures continue warming and winter ice cover shrinks, shipping traffic via the north is likely to increase, so control over that passage — and the long Greenlandic coastline that it skirts — will be of greater importance.

The U.S. National Oceanic and Atmospheric Administration shared graphs in 2022 predicting the new routes that would become available to regular tankers around Greenland over the coming decades.
 
Graphics shared by the U.S. National Oceanic and Atmospheric Administration in 2022 show the sea routes through the Arctic that are expected to become viable to regular vessels (in blue) and polar-class vessels (in red) around Greenland over the coming decades.
NOAA

NOAA's modeling shows a dramatic increase in viable journeys for both polar-class vessels fortified to forge through sea ice, and normal open water-faring ships.
The agency even predicts that by 2059, it will likely be possible for a polar-class vessel to sail the most direct route, right across the North Pole, as the formation of sea ice reduces further.
 
Links :

Wednesday, January 14, 2026

Severe winter storm hits UK shipping, sends containers overboard

Shipping near the Isle of Wight and elsewhere in the English Channel was impacted by a severe winter storm (European Space Agency file photo)

From Maritime Executive

The UK’s Maritime & Coastguard Agency is reporting a busy night and efforts on Friday, January 9, to track containers after a severe winter storm crossed the region around the English Channel overnight. Warnings were posted for shipping as containers went overboard near the Isle of Wight.

In meteorological terms, the storm became what is known as a bomb cyclone, where the storm rapidly intensifies.
It, however, left local areas surprised by the ferocity.
There were reports of wind gusts of 73 mph at Needles on the western side of the Isle of Wight.
At Portland, the winds were measured at approximately 65 mph, while in parts of Devon and Cornwall the winds reached 99 mph.

There were widespread reports of flooding, with the Portland Beach Road closed for hours due to high waves, while parts of the region reported sleet and even snow.
Elsewhere, 22 mm of rain was recorded in the Channel Islands.

A huge wave crashes on the jetty of the harbour of Le Conquet in western France, on January 8, 2026. © Fred Tanneau, AFP

The storm grew in intensity in the evening, peaking around 2300 local time.
The winds and waves, however, continued much of the night.

It was around the peak of the storm that the MCA reported it received a call about containers going overboard.
Around 2310, it was informed that an unnamed ship had lost 17 containers near Nab Tower and the Isle of Wight.
While the first report was being processed, a second vessel reported it had lost seven containers about 16 nautical miles south of St. Catherine’s Point.

The MCA said it had fixed-wing aircraft searching on Friday for a total of 24 containers believed to be in the water.
Ships were being warned of the danger.

The MCA was working with the shipping companies to determine the contents of the boxes.

Some reports said the first lot was believed to be reefers.
The second lot was thought to be empties, and the MCA said there was a good chance that some of the boxes sank in the high seas.

It emphasized that it is the responsibility of the shipping companies to locate and retrieve the overboard containers.

These losses come just a month after another reefer vessel lost 16 containers in the same general area. Boxes washed ashore and on the beaches, and inland, people were finding bananas.
At last account, 13 of the 16 containers were located, and the others were thought to have sunk in the waterway.

The MCA launched an investigation, noting that one concern was improperly secured containers, or it said that crews sometimes started to remove restraints in anticipation of reaching port to speed the handling.

While the search was continuing for the overboard containers, the weather was also impacting other shipping operations.
Hovertravel to the Isle of Wight was entirely canceled. DFDS was warning of disruptions and delays due to winds and waves for its cross-channel service between Dover and France.
 
Links :

Tuesday, January 13, 2026

The oceans just keep getting hotter


Getty Images

From Wired by Molly Taft

For the eighth year in a row, the world’s oceans absorbed a record-breaking amount of heat in 2025.
It was equivalent to the energy it would take to boil 2 billion Olympic swimming pools.


SINCE 2018, A group of researchers from around the world have crunched the numbers on how much heat the world’s oceans are absorbing each year.
In 2025, their measurements broke records once again, making this the eighth year in a row that the world’s oceans have absorbed more heat than the years before.

The study, which was published Friday in the journal Advances in Atmospheric Science, found that the world’s oceans absorbed an additional 23 zettajoules’ worth of heat in 2025, the most in any year since modern measurements began in the 1960s.
That’s significantly higher than the 16 additional zettajoules they absorbed in 2024.
The research comes from a team of more than 50 scientists across the United States, Europe, and China.

A joule is a common way to measure energy.
A single joule is a relatively small unit of measurement—it’s about enough to power a tiny lightbulb for a second, or slightly heat a gram of water.
But a zettajoule is one sextillion joules; numerically, the 23 zettajoules the oceans absorbed this year can be written out as 23,000,000,000,000,000,000,000.

John Abraham, a professor of thermal science at the University of St.
Thomas and one of the authors on the paper, says that he sometimes has trouble putting this number into contexts laypeople understand.
Abraham offers up a couple options.
His favorite is comparing the energy stored in the ocean to the energy of atomic bombs: The 2025 warming, he says, is the energetic equivalent to 12 Hiroshima bombs exploding in the ocean.
(Some other calculations he’s done include equating this number to the energy it would take to boil 2 billion Olympic swimming pools, or more than 200 times the electrical use of everyone on the planet.)

“Last year was a bonkers, crazy warming year—that's the technical term,” Abraham joked to me.
“The peer-reviewed scientific term is ‘bonkers’.”

The world’s oceans are its largest heat sink, absorbing more than 90 percent of the excess warming that is trapped in the atmosphere.
While some of the excess heat warms the ocean’s surface, it also slowly travels further down into deeper parts of the ocean, aided by circulation and currents.

Global temperature calculations—like the ones used to determine the hottest years on record—usually only capture measurements taken at the ocean’s surface.
(The study finds that overall sea surface temperatures in 2025 were slightly lower than they were in 2024, which is on record as the hottest year since modern records began.
Some meteorological phenomena, like El Niño events, can also raise sea surface temperatures in certain regions, which can cause the overall ocean to absorb slightly less heat in a given year.
This helps to explain why there was such a big jump in added ocean heat content between 2025, which developed a weak La Niña at the end of the year, and 2024, which came at the end of a strong El Niño year.) While sea surface temperatures have risen since the industrial revolution, thanks to our use of fossil fuels, these measurements don’t provide a full picture of how climate change is affecting the oceans.

“If the whole world was covered by a shallow ocean that was only a couple feet deep, it would warm up more or less at the same speed as the land,” says Zeke Hausfather, a research scientist at Berkeley Earth and a coauthor of the study.
“But because so much of that heat is going down in the deep ocean, we see generally slower warming of sea surface temperatures [than those on land].”

Surface temperatures, Hausfather says, are what most directly impact human societies: They have direct effects on weather patterns and most of the ocean life we interact with.
But the amount of heat stored in deeper parts of the ocean is a key metric for understanding how climate change is affecting the planet.

“Ocean heat content is in many ways the most reliable thermostat of the planet,” he says.
“That’s where all the heat is going—and that's the reason why almost every year we set a new record for ocean heat content, because there's so much heat being absorbed by the ocean.”

The estimates of ocean heating in the paper were created using a mix of mathematical models of ocean warming as well as reams of data on ocean temperatures collected from sites around the world.
Humans have been tracking ocean temperatures for a long time; Benjamin Franklin recorded sea temperatures during his transatlantic voyages.
In the 1870s, the HMS Challenger expedition—which is largely credited with inventing modern oceanography—took measurements at deeper depths.
But regularly measuring temperatures substantially below the surface is a relatively new phenomenon.
The study’s earliest data goes back to the 1960s, when some navies began taking measurements of deeper ocean temperatures.

A key tool that revolutionized our understanding of deeper ocean temperatures is the international network of Argo floats, with more than 3,500 robotic buoys that were first deployed in the early 2000s to collect data on oceans around the world.
In addition to the Argo floats, the study pulls data from a variety of other sources, including data measured from buoys, ship hulls, satellites—and animals.
(“We actually put instruments on mammals that swim under ice, and so we can measure temperatures while they swim,” Abraham says. “They can take measurements where our robots can't go.”) 
The study also uses algorithmic models trained on particular sets of ocean data.

“It's really quite impressive that they get such consistent results using multiple datasets,” says Raphael Kudela, a professor of ocean science at UC Santa Cruz who was not involved in the study.
Kudela says that studies like these help to hammer home just how much climate change is altering the planet.

“What people often don't grasp is that it's taken 100 years to get the oceans that warm at depth,” he says.
“Even if we stopped using fossil fuels today, it's going to take hundreds of years for that to circulate through the ocean.
We're going to pay this cost for a very, very long time, because we've already put the heat in the ocean.”
 
Links :

Monday, January 12, 2026

The Cayman Islands’ pioneering journey in ocean mapping

 
The bathymetric data Saildrone Surveyor collected, overlapped with Google satellite imagery.

From Hydro by Wim van Wegen 
 
An exclusive economic zone mapped using autonomous systems

The Cayman Islands recently became the first nation to map its entire exclusive economic zone (EEZ) using autonomous systems, marking a significant moment for modern hydrography.
Led by Saildrone in collaboration with the UK Hydrographic Office, the mission charted more than 90,000 square kilometres of seabed, from coastal shallows to depths of 7,000 metres.
The results highlight new opportunities for the Cayman Islands’ blue economy while demonstrating how uncrewed surface vehicles can deliver large-scale, high-quality data safely and efficiently.
In this interview, Brian Connon of Saildrone reflects on the project’s challenges, achievements and wider implications for the region and the industry as a whole.

The Cayman Islands mission used Saildrone’s new production Surveyor, a 20-metre uncrewed surface vehicle equipped with radar, cameras, AIS and machine-learning systems for situational awareness.
Its 13-metre wing sail enables wind-powered propulsion, cutting the vessel’s operational carbon footprint by more than 97% compared to traditional survey ships.
According to Brian Connon, the integration of Starlink significantly enhanced the mission: “Starlink, particularly seeing how much it improved our ability to bring data ashore in near real time, allowed us to process information and verify data quality much faster.”

Connon saw that Starlink transformed how the team handled data at sea.
With the upgraded link, files were automatically named, grouped and transmitted from the vehicle to Saildrone’s Amazon Cloud environment, where automated processing routines immediately began assessing data quality.
Another major enhancement was the EM 304 MKII sonar, which extended the vehicle’s mapping capability to depths of 7,000 metres.
Although similar to earlier models, the new system offered significantly greater range, and Saildrone’s partner Kongsberg played a crucial role in helping the team unlock its full potential.
The mission also benefited from improvements to the sound velocity profiler (SVP) developed with AML Oceanographic; upgrades to the inductively charged system and a shift from Bluetooth to Wi-Fi provided a stronger, more reliable connection.

Navigating Sargassum and hurricanes

The Caribbean’s 2024 Sargassum bloom was unprecedented, repeatedly clogging the profiler as it returned to the vehicle and posing a constant threat to the Surveyor’s operations.
“We would try to pull up our SVP, and it would be covered with seaweed and unable to seat properly in its receptacle, so it couldn’t charge,” Connon recalls.
“We had to come up with a very creative way of dealing with that, which was a mechanical chopper of the seaweed.”

Beyond Sargassum, the mission coincided with an active hurricane season, forcing the team to develop evasion strategies.
“If possible, we tried to stay on survey but in a different area of the EEZ, and that worked a couple of times,” Connon says.
“Our pilots were really good at looking ahead and determining the impacts from the hurricanes and manoeuvring the vehicle out of harm’s way if needed.”

Visualization with the GeoGarage platform (NOAA nautical raster charts)

Merged bathymetric dataset around the Cayman Islands displayed over a GEBCO background.

The Surveyor’s wind-propelled design and high-efficiency diesel generator allowed it to endure long-duration missions without refuelling, a significant advantage in remote areas such as the Cayman Islands’ EEZ.
“We learned our true operating parameters, our specific swath widths in the depths we were in.
Towards the end, we brought another vehicle in so we could have two working and that allowed us to do a comparison too.”

Maritime safety and economic planning

The high-resolution bathymetric data collected by Saildrone is a cornerstone for the Cayman Islands’ blue economy.
“The UKHO is processing all this data, and it is their intent to update all of the nautical charts around the Cayman Islands,” Connon explains.
“They flew a bathymetric Lidar there in 2018-2020, but the Cayman Islands drop off very quickly so the Lidar doesn’t get very far offshore.”

Connon notes that the new collected data reaches far beyond its immediate use for updated nautical charts.
With a complete high-resolution dataset now available, the Cayman Islands can start assessing underwater features in far greater detail, from identifying new fishing grounds to locating coral formations or planning future subsea cable routes.
This baseline information effectively unlocks the full potential of the islands’ blue economy.
It allows decision makers to examine where new resources might be found, what areas require protection and whether there are archaeological sites worth investigating – all supported by a clearer and more comprehensive understanding of the seafloor.

The mission, which is philanthropically funded by the London & Amsterdam Trust Company Limited, aims to leave a lasting legacy for the Cayman Islands.
“I know they’re excited about it as well,” Connon notes.

 
The Saildrone Surveyor, a 20-metre USV, supports long-duration ocean missions and delivers deep-ocean bathymetric measurements.

From raw data to global contributions

The raw bathymetric, backscatter and ocean profile data are now in the hands of the UKHO.
Connon: “What we’ve been doing all along is providing them with datasets, and they’re downloading and putting it into their normal workflow.
They’ve been very happy with us on that.” He elaborates on the processing timeline: “It’ll probably be sometime next year before all of that data is fully validated and processed by them.
We did have to wait a little in the shallow areas because the tide gauges they had installed for their surveys were taken out by a hurricane.
Luckily, the Cayman Islands had put in a storm surge gauge in Georgetown that we could reference and use for the tidal information we needed.”

The mission’s success has broader implications for small island nations.
Connon regards this as a very good example of how small island developing states can get their EEZ mapped.
While not all states have access to philanthropic funding, it does show what can be done and provides a goal for other nations.

Refining autonomous technology

The Cayman Islands mission was a proving ground for Saildrone’s Surveyor vehicles.
“It was a long project that gave us an opportunity to identify challenges or issues and the time to fix them while we were surveying,” Connon notes.
“Did that work? Yes, it did.
It was really about learning our own capabilities and limitations with respect to these vehicles.
It proves that these USVs can do this work.
You don’t need an expensive ship to go out there with a lot of people on board.” He adds: “What I would love to see is someone with a ship and an AUV or an ROV looking at our data and saying: ‘Hey, look at that, that’s a pretty interesting feature.
We should go investigate that further.’”

“We’re essentially doing a kind of reconnaissance, an exploratory survey from the surface,” Connon explains.
“We did the same thing for NOAA in the Aleutian Islands – they brought their ship in afterwards and deployed ROVs to the sites they’d identified in our data.
What we’re really showing is that the robots can take on the mapping and the crewed vessels can focus on the detailed follow-up.”

Bathymetric data collected by the Saildrone Surveyor USV over the 60 Mile Bank, Cayman Islands.
Technology, sovereignty, stewardship


As autonomous systems take on a larger role in ocean mapping, they bring not only technical benefits but also questions about data ownership and responsible use.
During the Cayman Islands mission, Brian Connon returned several times to the principle that national sovereignty must remain central.
“The data we collect belongs to the Cayman Government,” he says.
“It’s up to them to decide how they’re going to distribute that.
Autonomous systems can help and provide all the information, but it should belong to that country.
That’s the path we’re on, and most of the autonomous companies I know operate in a similar way.”

That position shapes how Saildrone advises its partners.
Connon describes the balance between contributing to global initiatives and safeguarding strategic interests.
“We’re encouraging them to share that with Seabed 2030,” he notes.
“However, this may be at a resolution that’s good for Seabed 2030, but not the full resolution because that is something that is valuable to the nation.”

Evolving role of hydrographers

Looking ahead, Connon sees autonomy, AI and machine learning reshaping the workflow of hydrography.
The trajectory is clear to him: “The goal is to have autonomous systems collecting data and either processing it on the edge, on the vehicle itself, or sending it into a cloud where an AI/ML system is processing that data.”

Yet technological progress also prompts questions about the profession itself.
Connon acknowledges these concerns with a familiar example.
“I get this question a lot: ‘Is the hydrographer going to be out of work?’ And I think the answer really is no, because we’re going to be designing control and monitoring systems that allow a person to monitor more than one vehicle.”

He underscores that expertise remains essential, regardless of how much automation enters the workflow.
“The fundamental education and training that a hydrographer has still applies.
We still have to understand how that data is being acquired.
AI and machine learning will be great on the data, but if the data being collected isn’t collected properly, if you’re not taking into account all those things, it doesn’t matter.”

He expects the way hydrographers are trained to shift, with greater emphasis on data handling and smarter approaches to collection.
At the moment, autonomous systems are not formally included in IHO Category B programmes unless an institution chooses to add them, but: “I believe that will change.
In the future, some hydrographers may carry out meaningful work without ever stepping aboard a vessel – an idea that may raise eyebrows among traditionalists yet could open the door for people who are unable to go to sea but still want to contribute.
It’s going to be a change,” he says, “but a positive one.”

That shift will require new approaches to professional development.
“I think it is going to be a change.
We’re looking at things like microcredentials that you can offer as a continuing education credit to a hydrographer on various things – whether it’s the sonars, USVs or using Lidar.”

80m-gridded bathymetry of the 12 Mile Bank, shown alongside a depth profile across the feature.

Conclusion

The Cayman Islands mission stands as a significant marker in the evolution of autonomous hydrography, showing how USVs can operate in demanding conditions while delivering consistent, high-quality results.
For small island nations as well as coastal communities, these systems offer a practical way to map and manage marine environments at a scale that was previously out of reach.

Brian Connon views the mission as a defining moment for autonomous ocean mapping.
Operating in Sargassum-choked, hurricane-exposed waters highlighted the maturity and resilience of the technology.
“This mission shows what only autonomous surface vehicles can achieve today: mapping at a level of detail and endurance that was previously unattainable, even in some of the world’s most challenging waters.
It points to what’s now possible for nations looking to understand and manage their ocean spaces.”

Looking ahead, Connon believes that advanced technology and human judgement will increasingly reinforce one another.
“The ocean is unforgiving, yet the mission’s success demonstrates how technology and human expertise can collaborate to explore and protect our oceans.” Autonomous systems, he adds, will play a central role in mapping EEZs: “They’re not just the future – they’re the present.”
 
Links :