The International Maritime Organization (IMO) has reached a landmark regulatory milestone with the formal adoption of the International Code of Safety for Maritime Autonomous Surface Ships (MASS Code), finalized at the 111th session of the Maritime Safety Committee (MSC 111), held from 13 to 22 May 2026 in London.
The MASS Code establishes a goal-based framework to ensure that autonomous ships meet safety, security, and environmental protection standards equivalent to those required for conventional manned vessels. Importantly, it underscores the importance of human oversight, with the master retaining overall responsibility for the ship at all times — even if not on board.
Scope and Application
The code applies strictly to cargo ships regulated under SOLAS (the International Convention for the Safety of Life at Sea) and is slated to take effect on 1 July 2026. It will initially be implemented on a voluntary basis for at least two years, giving member states and shipping companies the opportunity to build operational experience before binding rules come into force.
The Road to Mandatory Rules
The MASS Code is part of a carefully planned regulatory roadmap:
- July 2026 — Non-mandatory MASS Code takes effect
- December 2026 — MSC 112 to develop a framework for an Experience-Building Phase (EBP)
- 2028 — Development of the mandatory MASS Code begins, informed by EBP results and sub-committee reviews
- By 1 July 2030 — Expected adoption of the mandatory MASS Code, for entry into force on 1 January 2032
Key Areas Covered by the Code
The MASS Code addresses the full spectrum of autonomous vessel operations, including:
- Safe vessel design and operations
- Cybersecurity and remote monitoring
- Navigation, collision avoidance, and emergency response
- Environmental protection and MARPOL compliance
- Human oversight and accountability
- Compliance with SOLAS and other applicable IMO instruments
What This Means for the Industry
The IMO described the Code as “a milestone that puts IMO at the forefront of regulating emerging technologies, enabling innovation while keeping safety, accountability and the human element central to shipping.” It is the culmination of nearly a decade of multilateral discussions, legal work, and on-the-water trials, enabling new and conventional technologies to operate safely together.
At Centrix Maritime, we are actively monitoring these developments and their implications for vessel inspections, compliance audits, and safety assessments. As autonomous and AI-enabled ships move from trials to commercial operations, the inspection and audit landscape will evolve — and our team is ready to support owners, operators, and flag states in navigating this new regulatory environment.