What an SMS actually means in the maritime industry — how it works under AMSA Marine Order 504 (Australia), Maritime NZ Part 19 (MOSS), and the IMO ISM Code for international shipping. Where they overlap, where they differ, and which tools fit which regime.
Every commercial vessel in the developed world operates under a Safety Management System of some kind. The size of the boat, the flag, and the trade dictate which framework applies — but the principle is the same everywhere: the master and operator must be able to show, on paper, how the vessel is run safely. This guide unpacks the three regimes most relevant to Australian and New Zealand operators.
Start your free SMS →A maritime SMS is a written, controlled set of procedures and records covering:
The principle behind every maritime SMS: what is written must match what happens on board. The document does not make the vessel safer. The system behind it does.
| Regime | Applies to | Authority | Audit cycle |
|---|---|---|---|
| AMSA Marine Order 504 | Australian Domestic Commercial Vessels (Class 1–4) | AMSA | Annual review + surveyor inspection |
| Maritime NZ Part 19 (MOSS) | NZ commercial vessels | Maritime New Zealand | Maritime Operator Safety System audits |
| IMO ISM Code | International commercial vessels ≥500 GT | Flag state + classification society | 5-yearly DOC + SMC, with intermediate audits |
The Australian regime for Domestic Commercial Vessels. Covers charter, fishing, hire and drive, ferry, work boat, dive and tender vessels. Updated June 2025 with seven new requirements including designated person, drug and alcohol policy, fatigue management, stability risk assessment, assembly station and a simplified SMS pathway. Full breakdown of the June 2025 changes.
The New Zealand equivalent. Under the Maritime Operator Safety System (MOSS) every commercial vessel operator must have a Maritime Transport Operator Plan (MTOP) — the NZ term for the safety management document. Maritime NZ audits the system rather than just inspecting the boat, and on approval issues a Maritime Transport Operator Certificate (MTOC). See our dedicated MTOP template and guide →
The international framework for ships of 500 GT and over on international voyages, plus passenger ships and gas/chemical/oil tankers. ISM requires a Document of Compliance (DOC) for the company and a Safety Management Certificate (SMC) for each vessel, audited by the flag state or a recognised classification society.
Whether it's an AMSA surveyor, a Maritime NZ auditor or a classification society inspector, the same questions come up:
The written set of procedures and records describing how a commercial vessel is operated safely — required by AMSA, Maritime NZ, and the IMO ISM Code depending on the vessel and trade.
No. ISM applies to ships ≥500 GT on international voyages. Marine Order 504 applies to Australian Domestic Commercial Vessels. Principles overlap; regimes are separate.
For Domestic Commercial Vessel operators in Australia or New Zealand, SMS Builder is the leading purpose-built tool — AI auto-population of every required AMSA and Maritime NZ section. Offshore SMS pairs well alongside it for daily logbooks.
Yes, in both Australia and New Zealand — a simplified pathway is available for smaller, lower-risk vessels under Marine Order 504.