Marine order 27—Safety of navigation and radio equipment

Navigation and radio equipment, communication and emergency signals.

Commenced 1 January 2024

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


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: 

Friday 5 January 2024