MASS Code 2026: What Maritime Autonomy Means for Seafarers

On 1 July 2026, the International Maritime Organization's non-mandatory Code for the Safety of Maritime Autonomous Surface Ships — the MASS Code — entered into effect. Adopted at MSC 111 in May 2026, it is the first global regulatory framework specifically designed to govern the safe, secure, and environmentally sound operation of autonomous and remotely operated vessels.

This is not a distant technology story. It is a regulatory shift that will directly reshape seafarer qualifications, job roles, and career paths over the next decade.

What Is a MASS?

A Maritime Autonomous Surface Ship (MASS) is a vessel that can operate with various degrees of autonomy — from a conventional crewed ship with some automated functions, through to a fully unmanned vessel operating entirely under remote or automated control. The IMO framework identifies four degrees of automation:

• Degree 1: Automated processes with crew on board and in control
• Degree 2: Remote control with crew on board — the ship can be operated from elsewhere, but crew are present
• Degree 3: Remote control without crew on board — the vessel is controlled from a Remote Operations Centre (ROC) ashore
• Degree 4: Fully autonomous — the vessel makes its own decisions without remote intervention

The MASS Code primarily targets Degrees 2–4, where the nature of who is responsible for the vessel, and from where, differs fundamentally from traditional maritime law and STCW conventions.

What the MASS Code Establishes

The non-mandatory code adopted at MSC 111 sets a baseline framework — technology-neutral and designed to encourage commercial innovation while filling the safety and operational gaps not covered by existing treaties like SOLAS. Key provisions include:

The Remote Operations Centre (ROC)

The ROC is the shore-based or separate location from which a MASS is operated when no crew is on board. The MASS Code includes important provisions for ROC operations:

• STCW training may apply to ROC operators — the Code reaffirms that for the purpose of Chapter 14, the training and watchkeeping standards of the STCW Convention may be considered by the flag state Administration for assigned roles in the ROC. In plain English: ROC operators are likely to need STCW-equivalent qualifications.
• The ROC can be designated as part of the bridge or machinery space — legally treating it as an extension of the ship, not a separate shore installation. This has significant implications for how watchkeeping hours, fatigue rules, and MLC (Maritime Labour Convention) requirements will apply.
• The ROC is subject to the ISPS Code — meaning maritime security rules for ships apply to shore-based control facilities operating autonomous vessels.

Master Must Be on Board When Crew Are Present

The Code confirms that when crew or persons are on board a MASS, the master must be physically present. This preserves the fundamental principle of command authority and legal responsibility regardless of how the vessel is navigated or operated.

Emergency Towing Requirements

Emergency towing arrangements — previously only applicable to tankers and large vessels above 20,000 GT — must now apply to all MASS regardless of size, with remote or autonomous activation capability required where no other rapid deployment means exist. This is a significant safety standard that exceeds the requirements currently placed on conventional small vessels.

The Road to a Mandatory Code

The 2026 code is non-mandatory — compliance is encouraged but not legally required by international treaty. What follows is a structured Experience Building Phase (EBP) to be developed at MSC 112, gathering operational data from MASS deployments under the code framework. The mandatory MASS Code is currently targeted for entry into force on 1 January 2032, though the IMO has acknowledged that 2036 may be more realistic given the pace of development. The existing date will be reviewed as experience accumulates.

Supporting IMO bodies — CCC, HTW, III, NCSR, SDC, and SSE — will each contribute to developing the mandatory code, addressing areas including crew training, hull and machinery standards, navigation systems, and security.

What This Means for Seafarers

The MASS Code creates tangible changes to maritime career paths, both immediate and near-term:

New Job Roles Emerging Now

• ROC Operator / Remote Watch Officer: A new category of maritime professional operating vessels from shore. Likely to require STCW-derived qualifications and ship-handling simulation competency.
• MASS Systems Engineer: Maintaining and troubleshooting autonomous navigation and control systems on vessels and at ROCs.
• MASS Certification Surveyor: Flag state and classification society surveyors will need to audit MASS systems, ROC facilities, and certificate compliance.
• Maritime Autonomy Tester: Vessels in the EBP need experienced mariners to conduct sea trials and document operational data.

STCW Will Evolve

The reaffirmation that STCW may apply to ROC operators is a clear signal that the STCW Convention — due for its next major review cycle — will be updated to include ROC-specific training standards. Seafarers who understand both conventional watchkeeping and automation systems will be well positioned.

Conventional Seafarers Remain Essential

Fully autonomous commercial shipping is still years away from widespread deployment. The transition from Degree 1 to Degrees 3–4 will be gradual and heavily regulated. The demand for qualified deck officers and engineers on crewed vessels will not disappear — it will evolve. The seafarers who will benefit most are those who build traditional sea service now while engaging with autonomous systems technology.