COLREG, short for the “Convention on the International Regulations for Preventing Collisions at Sea,” is an international agreement that established basic rules and regulations to prevent collisions at sea. This agreement, often referred to as the "Rules of the Road at Sea," aims to ensure safe navigation for all types of vessels, including ships, yachts, fishing boats, and commercial maritime traffic.

COLREG was adopted in 1972 under the auspices of the International Maritime Organization (IMO) and consists of 38 rules that meticulously regulate the behavior of vessels in various situations. These rules cover everything from right-of-way, light signals, and sound signals to navigation in dense fog or limited visibility.

The purpose of COLREG is to maintain safety at sea and prevent collisions between vessels moving in different directions or located near each other. This agreement is vital for international maritime traffic, providing clear instructions and standards that vessels must follow to avoid accidents and collisions.

Below is a list of all 38 COLREG rules:

1. Rule 1 – General Provisions: The aim of these rules is to ensure safe navigation at sea.

2. Rule 2 – Responsibility of the Captain: The captain is responsible for implementing the rules, but the rules do not exempt the vessel from using all available means to avoid collisions.

3. Rule 3 – Use of Verbal Commands: Verbal signals or reasonable actions remain in use when approaching another vessel.

4. Rule 4 – Observation and Monitoring: Continuous monitoring of the sea and other vessels is essential.

5. Rule 5 – Speed Management: The vessel's speed must allow for safe stopping within a reasonable distance.

6. Rule 6 – Adjusting Speed to Conditions: Speed must be adjusted to visibility, traffic density, vessel maneuverability, and navigational restrictions.

7. Rule 7 – Vessel Identification at Sea: Specifies methods of identifying vessels, including distinguishing between the starboard (green light) and port side (red light).

8. Rule 8 – Sound Signals: Defines sound signals used for communication between vessels.

9. Rule 9 – Navigation in Channels or Narrow Waterways: Defines vessel behavior in narrow waterways.

10. Rule 10 – Meeting of Vessels: Defines rules for meeting and passing between two vessels.

11. Rule 11 – Overtaking: Specifies rules for overtaking other vessels.

12. Rule 12 – Lighting: Specifies types and positions of lights on various vessels.

13. Rule 13 – Towing Light Signals: Defines light signals used when a vessel is towing.

14. Rule 14 – Fishing Vessel Light Signals: Specifies light signals used by fishing vessels.

15. Rule 15 – Towing Vessels' Light Signals: Defines light signals for vessels towing or pushing objects.

16. Rule 16 – Cargo Vessel Light Signals: Specifies light signals on cargo vessels.

17. Rule 17 – Anchored Vessel Light Signals: Specifies light signals for anchored vessels.

18. Rule 18 – Buoyancy Object Light Signals: Light signals used for coastal beacons or other buoyancy objects.

19. Rule 19 – Light Signals During Port Departure or Arrival: Defines light signals for vessels departing or arriving at port.

20. Rule 20 – Light Signals of Motor Vessels on Inland Waters: Light signals used on motor vessels in inland waters.

21. Rule 21 – Light Signals for Non-Maneuverable Vessels: Light signals used for vessels unable to maneuver.

22. Rule 22 – Light Signals for Disabled Vessels: Light signals used on disabled vessels.

23. Rule 23 – Lighting of Lights: Specifies the lighting of lights on vessels.

24. Rule 24 – Sound Signals: Specifies sound signals used in various situations at sea.

25. Rule 25 – Sound Signals of Fishing Vessels: Defines sound signals used on fishing vessels.

26.Rule 26 – Sound Signals of Vessels with Restricted Maneuverability: Sound signals used by vessels with restricted maneuverability.

27.Rule 27 – Sound Signals of Natural Force-Driven Vessels: Sound signals used by vessels driven by natural forces.

28. Rule 28 – Sound Signals of Sailing Vessels: Sound signals used by sailing vessels.

29. Rule 29 – Sound Signals of Vessels Entering or Exiting Ports: Sound signals used by vessels entering or leaving ports.

30. Rule 30 – Sound Signals of Vessels Moving in Reverse: Sound signals used by vessels moving backward.

31. Rule 31 – Sound Signals of Vessels Towing Cargo: Sound signals used by vessels towing cargo.

32. Rule 32 – Sound Signals of Vessels Working on or Near Waterways: Sound signals used by vessels working on or near waterways.

33. Rule 33 – Supplementary Lighting Rules: Sound signals used by vessels working on or near waterways.

34. Rule 34 – Behavior of Non-Maneuverable Vessels: Specifies the behavior of vessels unable to maneuver.

35. Rule 35 – Sector Light Rules: Rules regarding sector lights used at sea.

36. Rule 36 – Vessel Management Means: Specifies rules for handling vessel equipment.

37. Rule 37 – Signal Discarding: Associated with the obligation to stop signaling in case of danger.

38. Rule 38 – Interaction of Rules: This rule governs situations where different COLREG rules apply.

These rules collectively create a detailed framework for vessel behavior at sea, aimed at preventing collisions and ensuring the safety of all vessels in open waters. Familiarity with and adherence to COLREG rules are crucial for every seafarer to ensure safe navigation and avoid potentially dangerous incidents.