Humanoid & robot atlas
Mayflower Autonomous Ship (MAS400)
Photo: Aysedevrim, CC BY-SA 4.0, via Wikimedia Commons
ResearchUnited KingdomFully autonomous

ProMare with IBM · autonomous vessel

Mayflower Autonomous Ship

MAS400

A 15 m solar-powered trimaran with a backup diesel generator whose AI captain picks the route and an AI navigator applies collision rules, with no one aboard. It was built to sample water for pollutants and study marine life.

Price
$1,300,000Ship cost reported at about £1 million (US$1.3 million at the time; Associated Press via Boston.com, June 2021).
Autonomy
DriverlessHow it runs
Driverless
In serviceSince 2021-06-15
Fleet
1Reported; details below
Speed
18.5 km/hFaster than 17%
Range
—Not published
Compare

Why it matters

An AI-captained research trimaran that completed an Atlantic crossing from England to North America in 2022, with one tow and a stop in Halifax.

Real-world use

Left England on 27 April 2022, diverted to Halifax after a charging fault (towed the last 186 nautical miles), then docked at Plymouth, Massachusetts on 30 June 2022; now based at Woods Hole Oceanographic Institution.

Timeline

First shown
2021-06-15
Released
Not yet
First transatlantic attempt from England (returned after 3 days)

Maker

ProMare with IBMCompany

How it drives

Fleet and city figures move fast; each carries its date and who reported it.

Driverless status
Driverless in service
Where it runs
Atlantic Ocean (Plymouth, England to Halifax and Plymouth, Massachusetts)
Driverless since
2021-06-15
Fleet
1 vessel
Rides, miles or loads
Transatlantic crossing from Plymouth, UK, on April 27 to Halifax, Canada, on June 5, 2022 (IBM, 2022).

How it stacks up

Against other boats & ships that publish the figure. Pick a measure.

  1. CorsairSaronic Technologies · 202464.8 km/h
  2. TCB Marlin SIDASefine Shipyard with Aselsan · 202464.8 km/h
  3. Sea Hunter (ACTUV)Leidos for DARPA (built by Christensen Shipyards and Vigor Industrial) · 201650.0 km/h
  4. SOLEIL (MEGURI2040 autonomous ferry trial)Mitsubishi Shipbuilding with Shin Nihonkai Ferry · 202248.2 km/h
  5. Yara BirkelandYara International with Kongsberg Maritime · 202127.8 km/h
  6. Mayflower Autonomous Ship (MAS400)ProMare with IBM · 202118.5 km/h
  7. Maxlimer (SEA-KIT X-class USV)SEA-KIT International · 20187.4 km/h

Mayflower Autonomous Ship (MAS400) is faster than 17% of the 6 other boats & ships that publish a speed. Bars show the 6 closest in date.

Speed 18.5 km/h 7.4 km/h64.8 km/h #6 of 7 · faster than 17%

Not published by the maker: height, weight, payload, joints, battery.

Public attention

How much public attention Mayflower Autonomous Ship (MAS400) gets, from open data.

  • No Wikipedia article of its own yet
  • No recent press stories listed yet

Measures how much people read and write about a robot, not how good it is. Measured 2026-10-14; same method for every robot. How it is measured

What’s inside

No component details published yet.

Movement
Other movement
How it runs
Fully autonomous. Does its job with nobody at the controls.

From the maker

Mayflower Autonomous Ship (MAS400) is the only vehicle from ProMare with IBM in the atlas.

Made, sold and where

No production or sales figures published yet.

Price
$1,300,000Ship cost reported at about £1 million (US$1.3 million at the time; Associated Press via Boston.com, June 2021).
How to get one
No official buying page found

Sources

Figures come from press coverage. Every link below backs something on this page.

IBM The Mayflower Autonomous Ship Has Reached North America

Photos and logos only identify each robot and its maker. Simbeing is not affiliated with, sponsored by or endorsing any company, and nothing here is advertising. Figures are for statistics only and are not advice of any kind. Terms of use