Marine order 19 - Tonnage measurement

Marine Order 19 sets out requirements for measuring vessel tonnage and issuing tonnage certificates under international rules.

An updated version of Marine Order 19 came into effect on 1 September 2025
Find out more about what changed and why in the consultation feedback report.

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Marine order 19 (MO19) gives effect to the International Convention on Tonnage Measurement of Ships (tonnage convention)  and sets out requirements for measuring and certifying vessel tonnage. It applies to regulated Australian vessels and foreign vessels operating in Australian waters.

The order covers:

  • applying for an international tonnage certificate
  • international tonnage certificate requirements and compliance with the tonnage convention for foreign vessels visiting Australian ports
  • how gross tonnage is measured depending on a vessel’s age
  • allowing prescribed Australian vessels to apply for an international tonnage certificate.
Announcement

An updated version of Marine Order 19 came into effect on 1 September 2025
Find out more about what changed and why in the consultation feedback report.

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Legislation and incorporated material

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Policy and Regulation

Last updated: 1 September 2025