Question 1

At what tonnage threshold does the ISPS Code (port/ship security) become mandatory for a commercial yacht, and what does it NOT apply to?

Accepted Answer

500GT — ISPS becomes mandatory at and above this threshold for commercial yachts; it does not apply to private yachts (regardless of size) or to commercial yachts below 500GT ISPS shares the same 500GT trigger as ISM, and critically distinguishes commercial use from private use — a private yacht of any size sits outside ISPS entirely, while a commercial yacht crossing 500GT must implement a Ship Security Plan (SSP) and obtain an International Ship Security Certificate (ISSC), changing how the vessel interacts with port facilities.

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.