Question 1

How does MLC 2006 apply differently to a 600GT commercial yacht trading internationally compared with a 300GT commercial yacht?

Accepted Answer

The 600GT yacht, being 500GT+ and on international voyages, requires a Maritime Labour Certificate and Declaration of Maritime Labour Compliance (DMLC); the 300GT yacht still must meet MLC's substantive crew welfare standards under flag state arrangements, but without the same certification/inspection regime that 500GT+ triggers The 500GT threshold recurs across ISM, ISPS, and MLC because international conventions commonly use it as the line between vessels requiring the full international certification regime and smaller vessels where flag-state-tailored arrangements (still requiring genuine compliance with the underlying welfare standards) apply instead.

Question 2

At what tonnage threshold does the full ISM Code (not just the lighter safety management provisions within the REG Yacht Code itself) become mandatory for a commercial yacht?

Accepted Answer

500GT — above this threshold a commercially registered yacht on international voyages must comply with the full ISM Code, requiring a Document of Compliance (DOC) for the management company and a Safety Management Certificate (SMC) for the vessel This is a hard regulatory line, not a judgement call — a 499GT yacht and a 501GT yacht sit in genuinely different compliance regimes. Below 500GT (and 24m+), the yacht-specific REG Yacht Code safety management provisions apply; at and above 500GT, the vessel steps up into the full SOLAS-derived ISM Code framework with its DOC/SMC audit and certification structure.

Question 3

What is the practical difference for a Master/Chief Officer between operating under the REG Yacht Code's own safety management provisions versus operating under a full ISM DOC/SMC once a yacht crosses 500GT?

Accepted Answer

Full ISM brings external audit cycles (internal audits, external Flag State/RO audits, non-conformity tracking and close-out), a formally documented Safety Management System with defined procedures across all departments, and a shore-based Designated Person Ashore (DPA) the Master must have direct access to at any time Full ISM is a meaningfully heavier compliance regime — formal audit cycles, documented procedures across every department (not just bridge/deck), and a mandatory DPA relationship are all new obligations a yacht crossing 500GT takes on, distinct from the more streamlined safety management approach below that threshold.