Marine order 19 - Tonnage measurement

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

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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.
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Last updated: 1 September 2025