_Regulation · Safety standard_

# IMO MASS Code -- first global framework for maritime autonomous surface ships

Canonical ID: `854db4ea-74b6-4133-9ec7-836ad4266c7a`

- **Jurisdiction:** [Global](/locations/global.md) (id: `6753d6b9-d63f-41f8-b672-4d80bdb4dd82`)
- **Kind:** `safety_standard`
- **Status (derived):** in_effect
- **Effective:** 2026-07-01

The International Maritime Organization's Code for Maritime Autonomous Surface Ships (MASS Code) entered into force on July 1, 2026 as a non-mandatory instrument following adoption at IMO MSC 111 (May 2026). It applies to cargo ships and establishes the first internationally agreed regulatory framework for vessels operating with reduced or no human crew. The code initiates an 'Experience Building Phase'; the IMO MASS Working Group will reconvene at MSC 112 in December 2026 to assess further development. As a non-mandatory instrument, flag states and operators may voluntarily comply; mandatory provisions are expected in a later phase. No specific commercial vessel has yet been confirmed as operating under the MASS Code framework.

## Sources (3)

1. https://www.imo.org/en/mediacentre/pressbriefings/pages/imo-adopts-mass-code.aspx
2. https://gcaptain.com/imo-adopts-mass-code-the-autonomous-ship-moves-from-drawing-board-to-regulated-reality/
3. https://www.dnv.com/news/2026/imo-mcs-111-new-mass-code-adopted/

## Common questions

### What does IMO MASS Code -- first global framework for maritime autonomous surface ships cover?

The International Maritime Organization's Code for Maritime Autonomous Surface Ships (MASS Code) entered into force on July 1, 2026 as a non-mandatory instrument following adoption at IMO MSC 111 (May 2026). It applies to cargo ships and establishes the first internationally agreed regulatory framework for vessels operating with reduced or no human crew. The code initiates an 'Experience Building Phase'; the IMO MASS Working Group will reconvene at MSC 112 in December 2026 to assess further development. As a non-mandatory instrument, flag states and operators may voluntarily comply; mandatory provisions are expected in a later phase. No specific commercial vessel has yet been confirmed as operating under the MASS Code framework.

### Where does IMO MASS Code -- first global framework for maritime autonomous surface ships apply?

IMO MASS Code -- first global framework for maritime autonomous surface ships is recorded as a safety_standard applying in Global on the DEPLOY registry.

### When did IMO MASS Code -- first global framework for maritime autonomous surface ships take effect?

IMO MASS Code -- first global framework for maritime autonomous surface ships is recorded as effective July 1, 2026 on the DEPLOY registry.

### Is IMO MASS Code -- first global framework for maritime autonomous surface ships still in effect?

IMO MASS Code -- first global framework for maritime autonomous surface ships is currently in effect and applies to covered operators in the named jurisdiction.

### What types of robots does IMO MASS Code -- first global framework for maritime autonomous surface ships apply to?

IMO MASS Code -- first global framework for maritime autonomous surface ships is recorded as applying to maritime on the DEPLOY registry.

### Which robot models on the DEPLOY registry fall under IMO MASS Code -- first global framework for maritime autonomous surface ships?

8 robot models on the DEPLOY registry match the form-factor scope of IMO MASS Code -- first global framework for maritime autonomous surface ships: ASView / C-Worker, Alistar, Armada, Autonomous Vessel System and 4 others. Form-factor scope match does not by itself establish compliance status; review the underlying primary sources for each operator.


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