SOLAS Ch V - Regulations
1. Application
2. Definitions
3. Exemptions & Equivalents
4. Navigation Warnings
5. Meteorological Services & Warnings
6. Ice Patrol Services
7. Search & Rescue Services
8. Life-Saving Signals
9. Hydrographic Services
10. Ship's Routeing
11. Ship Reporting Systems
12. Vessel Traffic Services
13. Aids to Navigation
14. Ships' Manning
15. Bridge Design
16. Maintenance of Equipment
17. Electromagnetic Compatibility
18. Navigational Systems & Voyage Data Recorder
19. Shipborne Navigation Systems
20. Voyage Data Recorders
21. International Code of Signals
22. Navigation Bridge Visibility
23. Pilot Transfer Arrangements
24. Use of Heading/Track Control Systems
25. Electrical Power
26. Steering Gear
27. Charts & Nautical Publications
28. Records of Navigational Activities & Daily Reporting
29. Distress Signals
30. Operational Limitations
31. Danger Messages
32. Information Required in Danger Messages:
33. Distress Situations
34. Safe Navigation
34-1 Master's Discretion
35. Misuse of Distress Signals
Regulation Appendix
A1. Categories of Waters & Classes of Ships
A2. Table of Requirements for Ships
A3. Nautical Charts & Publications
A4. WMO Maritime Services
A5. Routeing Systems
A6. Safe Manning
A7. Equipment Manuals
A8. Performance Standards & Type Approval
A9. Performance Standards for Navigational Equipment
A10. Voyage Data Recorders
A11. Navigation Equipment - New Ships
A12. Navigation Equipment - Existing Ships
A13. Magnetic Compass
A14. Electronic Charts
A15. Radar Reflectors
A16. Radar Equipment
A17. Automatic Identification Systems
A18. Steering Gear, Heading & Track Control Systems
A19. High Speed Craft Code
A20. Inspection & Survey of Navigational Equipment
A21. Pilot Transfer Arrangements
A22. Recording of Navigational Events
A23. Passenger Ship Operational Limitations
A24. Voyage Planning
A25. Guidelines for Voyage Planning
Regulation 4 - Navigational Warnings


  • Contracting Governments are required to promulgate all dangers to navigation.
Regulation 4
Each Contracting Government shall take all steps necessary to ensure that, when intelligence of any dangers is received from whatever reliable source, it shall be promptly brought to the knowledge of those concerned and communicated to other interested Governments.*

* Refer to the Guidance on the IMO/IHO World-Wide Navigational Warning Service adopted by the Organization by resolution A.706(17), as amended.


MCA Guidance
1. This Regulation is similar to Regulation 2(b) of SOLAS V/74 and obliges Contracting Governments to promulgate information relating to any dangers received from whatever reliable source.
2. It should be noted that while SOLAS V/74 specified which types of danger must be promulgated, the new Regulation does not.
3. Mariners should refer to Regulations 31 and 32 which lay down the masters' obligations to report dangers to navigation (Reg. 31) and provide the correct reporting format (Reg. 32.) (see also 6 below).
4. Navigational warnings are promulgated in the UK under a Memorandum of Understanding between the MCA and the UKHO. The service meets the requirements of Regulation 4 as well as IMO Resolution A.706(17) which implements the Worldwide Navigational Warning Service (WWNWS) The UKHO acts as the "national co-ordinator" for the UK in collating and issuing coastal warnings and acts as "NAVAREA coordinator" for Area 1.
5. See also MGN 23- NAVTEX Service Information
6. Mariners are requested to inform the UKHO immediately when new dangers or changes / defects in aids to navigation are identified. Full contact details and instructions, together with copies of the UKHO reporting form (Hydrographic Note) are provided in the weekly copy of the Admiralty Notices to Mariners.
7. See also IMO Resolution A.706(17) - Guidelines on the IMO/IHO Worldwide Navigation Warning Service.
Notices to Mariners Website:
Fax: +44(0)1823 322352
Tel: +44(0)1823 723315

Urgent navigational information - e-mail:

Other navigational information - e-mail:

Fax: +44(0)1823 284077


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