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
Annex 16 - Radar Equipment

Radar and associated equipment required by Regulation 19 of SOLAS V comprise:

  • Radar unit – 9 GHz

  • Radar unit – 3 GHz

  • Electronic Plotting Aid (EPA)
    EPA equipment enables electronic plotting of at least 10 targets, but without automatic tracking.

    NOTE – The wording of the Regulation in the case of EPA includes “..or other means to plot electronically the range and bearing of targets to determine collision risk.” Therefore manual plotting equipment is no longer acceptable except for existing vessels still complying with SOLAS V/74.

  • Automatic Tracking Aid (ATA)
    ATA equipment enables manual acquisition and automatic tracking and display of at least 10 targets.

  • Automatic Radar Plotting Aid (ARPA)
    ARPA equipment provides for manual or automatic acquisition of targets and the automatic tracking and display of all relevant target information for at least 20 targets for anti-collision decision making. It also enables trial manoeuvres to be executed.


9 GHz Radar - is required on any vessel of 300 gt. and over.

3 GHz Radar
- to- be fitted as the second radar, which is required on ships of 3000 gt. and over unless the Administration considers it appropriate to carry a second 9 GHz Radar. The two radars must be functionally independent of each other. The MCA will require a reasoned case for why a 3 GHz radar cannot be carried.

EPA - To be incorporated in Radar equipment on ships of 300 gt. and over, but less than 500 gt

ATA - To be incorporated in Radar equipment on ships of 500 gt. and over (replacing the requirement for an EPA)
On ships of 3000 gt. and over the second radar must also be equipped with an ATA. The two ATAs must be functionally independent of each other.

ARPA - To be incorporated in one radar equipment on ships of 10000 gt. and over. The second unit must incorporate ATA if not ARPA.

Summary of minimum Radar requirements:







300 – 499




500 – 2999




3000 – 10000





10000 +






* Administration may approve a second 9 GHz radar instead
** Or second ARPA

The Performance Standards and associated testing standards for radar equipment are listed in ANNEX 9 – IMO Performance Standards for navigational equipment

Associated Documents
ANNEX 20, section 8 for inspection and survey of radar equipment


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