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Marine order 27—Safety of navigation and radio equipment

Navigation and radio equipment, communication and emergency signals.

Current Marine Order 27 (Safety of navigation and radio equipment) 2023

Marine order 27 sets out the requirements for:

  • navigation safety measures and equipment
  • radio equipment and communications
  • safety, urgency and distress communications.
Assistance and tools

Related content


Marine Notices

Refer to the Federal Register of Legislation for previous versions of this marine order.

Reference material listed in Marine order 27

  • Admiralty List of Radio Signals, published by the Hydrographer of the Navy (UK) (access or borrow).
  • ARPANSA Standard for Limiting Exposure to Radiofrequency Fields – 100 kHz to 300 GHz (Rev. 1) (2021), as amended from time to time.
  • Guidelines for preparing plans for cooperation between search and rescue services and passenger ships, IMO Circular MSC.1/Circ.1079, as revised from time to time (register).
  • Guidelines for the onboard use and application of computers, IMO Circular MSC/Circ.891, as amended from time to time (register).
  • Guidance for the Reception of Maritime Safety Information and Search and Rescue Related Information as Required in the Global Maritime Distress and Safety System (GMDSS), IMO Circular MSC.1/Circ.1645, as amended from time to time (register).
  • International Convention for the Safety of Life at Sea (SOLAS) - Chapter IV and V (search, register or borrow).
  • International Convention on Standards of Training, Certification and Watchkeeping for Seafarers 1978 (STCW Convention (access).
  • International Aeronautical and Maritime Search and Rescue Manual (IAMSAR Manual) published jointly by ICAO and the IMO (access or purchase).
  • International Code of Signals, IMO (access or purchase).
  • Ships and marine technology – Marine magnetic compasses, binnacles and azimuth reading devices, International Standards Organization (ISO) 25862:2019 (access or borrow).
  • List of ship stations and Maritime Mobile Service Identity Assignments - International Telecommunications Union (access or borrow).
  • Manual for use by the Maritime Mobile and Maritime Mobile Satellite Services, International Telecommunications Union (access or borrow).
  • Revised guidelines for the onboard operational use of shipborne automatic identification systems (AIS), IMO resolution A.1106(29), as amended from time to time.
  • The Radio Regulations Edition of 2012, International Telecommunications Union (access or borrow).

Additional reference material

  • Guidelines for voyage planning, IMO resolution A.893(21).
  • Guidelines for recording of events related to navigation, IMO resolution A.916(22).
  • Guidelines on voyage planning for passenger ships operating in remote areas, IMO resolution A.999(25).
  • Participation of ships in weather routeing services IMO Circular MSC/Circ.1063 (register).
  • Participation in the WMO voluntary observing ships (VOS) scheme, IMO Circular MSC/Circ.1293, superseded by IMO Circular MSC.1/Circ.1293/Rev.1 (register). 
  • Guidelines on ergonomic criteria for bridge equipment and layout (IMO Circular MSC/Circ.982) (register).
  • Revised Performance Standards for Integrated Navigation Systems (INS), IMO Resolution MSC.252(83).
  • Guidelines for the Standardization of User Interface Design for Navigation Equipment, IMO Circular MSC.1/Circ.1609 (register). 
  • Guidelines for the presentation of navigational‐related symbols, terms and abbreviations, SN.1/Circ.243/Rev.2.
  • Performance Standards for the Presentation of Navigation‐related Information on Shipborne Navigational Displays, IMO Resolution MSC.191(79) (register).
  • Participation of non-SOLAS ships in the global maritime distress and safety system (GMDSS) IMO circular MSC/Circ.803 amended by IMO circular MSC.1/Circ.803/Rev.1 (register). 

Policy and Regulation

Last updated: 5 January 2024