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Marine order 27—Safety of navigation and radio equipment

Navigation and radio equipment, communication and emergency signals.

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Marine order 27 sets out the requirements for:

  • navigation safety measures and equipment
  • radio equipment and communications
  • safety, urgency and distress communications.
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Related content

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Marine Notices

Superseded
Reference
  • Admiralty List of Radio Signals, United Kingdom Hydrographer Office (UKHO)
  • Standard for Limiting Exposure to Radiofrequency Fields – 100 kHz to 300 GHz, Australian Radiation Protection and Nuclear Safety Agency, Australian Government
  • Guidelines for preparing plans for cooperation between search and rescue services and passenger ships, IMO Circular MSC.1/Circ.1079, as amended from time to time (access)
  • Guidelines for the onboard use and application of computers, IMO Circular MSC.1/Circ.891, as amended from time to time (access)
  • 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 (access)
  • International Convention for the Safety of Life at Sea (SOLAS) - Chapter IV and V (access)
  • International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW Convention) (access)
  • International Aeronautical and Maritime Search and Rescue Manual (IAMSAR Manual), published jointly by ICAO and the IMO (access)
  • International Code of Signals, IMO Publication (access)
  • ISO 25862:2019, Ships and marine technology – Marine magnetic compasses, binnacles and azimuth reading devices (access)
  • List of ship stations and Maritime Mobile Service Identity Assignments - International Telecommunications Union (access)
  • Manual for use by the Maritime Mobile and Maritime Mobile Satellite Services, International Telecommunications Union (access)
  • Revised guidelines for the onboard operational use of shipborne automatic identification systems (AIS), IMO resolution A.1106(29) as amended from time to time (access)
  • The Radio Regulations Edition of 2012, International Telecommunications Union (access)

Additional reference material

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

Last updated: 1 April 2026