ISM, ISPS and MLC for yachts: what your flag requires
Whether a commercial yacht needs full ISM, an ISPS certificate or something lighter depends on its size and its flag. Compared flag by flag, with sources.
A compliance package covers the three code families a commercial yacht is surveyed against: the ISM Code for safety management, the ISPS Code for security and the Maritime Labour Convention for labor standards. All three trace back to international conventions, but the size at which a smaller yacht has to comply with the full version of each differs by flag. WhichFlagToFly sets out each flag's own threshold below, with the source and check date beside it.
What is the ISM Code, and does it apply below the large-ship threshold?Link to this section
The International Safety Management Code requires a documented safety management system, a shore-based company to hold responsibility for it, and independent auditing. Above the size threshold every flag in this comparison applies it in full; below that threshold, the flags diverge sharply on what, if anything, is mandatory.
Malta's position, including its threshold and what happens below it: Full ISM Code compliance is required from 500 GT; below that it is voluntary and earns a Statement of Compliance.Commercial Yacht Code (CYC) 2025, Revision 1, Merchant Shipping Directorate, Transport Maltawww.transport.gov.mt (web.archive.org) · §21.1.1Retrieved 2026-08-28Effective 2025-07-01Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information. Cayman's, under the Red Ensign Group Yacht Code: The full ISM Code applies at 500 GT and over; under 500 GT a scaled safety management system is still mandatory.The Red Ensign Group Yacht Code, Part A: Large Yachts, July 2024 Edition, Red Ensign Groupwww.redensigngroup.org · Chapter 23B, §23B.1(1)Retrieved 2026-08-29Effective 2024-07-01Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information. The Marshall Islands' mini-ISM approach: The full ISM Code applies at 500 GT and above; under 500 GT a mini-ISM system is required for commercial certification.MI-103, the RMI Yacht Code, Rev. May/2026, Republic of the Marshall Islands Maritime Administratorwww.register-iri.com · Ch. II §1.11.1Retrieved 2026-08-28Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information. The three answers differ, and which one applies to a given yacht is a factor in the choice of flag.
What is ISPS, and when does a yacht need an ISSC?Link to this section
The International Ship and Port Facility Security Code sits alongside ISM and requires its own security assessment, a designated security officer, and an International Ship Security Certificate above the same large-ship threshold ISM uses. Below it, whether ISPS applies depends again on which flag the yacht flies.
Malta's ISPS position: Yachts of 500 GT and over need an International Ship Security Certificate; below that ISPS compliance is voluntary.Commercial Yacht Code (CYC) 2025, Revision 1, Merchant Shipping Directorate, Transport Maltawww.transport.gov.mt (web.archive.org) · §21.2.1Retrieved 2026-08-28Effective 2025-07-01Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information. Cayman's, under the Red Ensign Group code: Yachts of 500 GT and over must comply with the ISPS Code; Part A of the Code states no requirement below that, which is the Code's silence and not a finding that none applies.The Red Ensign Group Yacht Code, Part A: Large Yachts, July 2024 Edition, Red Ensign Groupwww.redensigngroup.org · §31.1(1)Retrieved 2026-08-29Effective 2024-07-01Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information.
Which code will your yacht be surveyed against?Link to this section
A commercial yacht is surveyed against one named code, and that code, not the yacht's size alone, sets its specific thresholds, exemptions and paperwork. Malta, the Red Ensign registers and the Marshall Islands each publish their own code, with their own tests for what counts as a commercial yacht.
Malta's governing code: Commercial yachts of 24 m and over follow Malta's own Commercial Yacht Code; a Small Commercial Yacht Code covers 12 to 24 m.Commercial Yacht Code (CYC) 2025, Revision 1, Merchant Shipping Directorate, Transport Maltawww.transport.gov.mt (web.archive.org) · §3.1.1Retrieved 2026-08-28Effective 2025-07-01Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information. Cayman's: Commercial yachts of 24 meters load line length and over, up to 12 passengers, follow the Red Ensign Group Yacht Code Part A.The Red Ensign Group Yacht Code, Part A: Large Yachts, July 2024 Edition, Red Ensign Groupwww.redensigngroup.org · §1.2(1)Retrieved 2026-08-29Effective 2024-07-01Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information. The Marshall Islands': The RMI Yacht Code applies to commercial yachts of any tonnage; private yachts of 18 m and over may use a limited-charter regime.MI-103, the RMI Yacht Code, Rev. May/2026, Republic of the Marshall Islands Maritime Administratorwww.register-iri.com · Ch. I §2.1.2Retrieved 2026-08-29Effective 2026-01-01Open sourceInformational only, not legal, tax or financial advice. Contact a qualified professional for current information. Knowing which code applies before a survey is booked avoids commissioning the wrong inspection.
What does an MLC inspection check?Link to this section
The Maritime Labour Convention sets minimum standards for crew working and living conditions and, where it applies, requires a signed seafarers' employment agreement, inspection-ready records, and evidence of financial security in case wages go unpaid or a crew member is abandoned. An MLC inspection checks the paperwork as much as the vessel.
Some flags fold MLC compliance directly into their own survey process rather than treating it as separate. Ask a compliance or management firm which parts of MLC apply to a specific yacht and flag rather than assuming the Convention baseline is all that applies.
What does a compliance package cost?Link to this section
The cost of a compliance package is the survey and certification fees the flag charges, plus the shore-based company's own fee for holding and auditing the system. Only the first is published. No neutral source sets out what a compliance provider charges for the second, so this page states no fee band and points instead at what each flag requires.
Who runs compliance for you day to day?Link to this section
An owner can hold the safety management responsibility personally or appoint a shore-based company to hold it instead; most commercially operated yachts appoint a manager who already runs ISM, ISPS and MLC compliance for other vessels and has the audit relationships in place.
See yacht management for how compliance typically sits inside a wider management scope, including who is allowed to hold the Document of Compliance under a given flag, and the yacht flag comparison for how the registers named above compare more broadly.
Compare the registers
The registers themselves are compared side by side, fee by fee, on their own pages.
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