Rule 6 Safe speed
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Conventions - COLREGS - International Regulations for Preventing Collisions at Sea - International Regulations for preventing Collisions at Sea, 1972 - Rule 6Safe speed

Rule 6 Safe speed

 Every vessel shall at all times proceed at a safe speed so that she can take proper and effective action to avoid collision and be stopped within a distance appropriate to the prevailing circumstances and conditions.

In determining a safe speed the following factors shall be among those taken into account:

  (a) By all vessels:

  • (i) the state of visibility;

  • (ii) the traffic density including concentrations of fishing vessels or any other vessels;

  • (iii) the manoeuvrability of the vessel with special reference to stopping distance and turning ability in the prevailing conditions;

  • (iv) at night the presence of background light such as from shore lights or from back scatter of her own lights;

  • (v) the state of wind, sea and current, and the proximity of navigational hazards;

  • (vi) the draught in relation to the available depth of water.

  (b) Additionally, by vessels with operational radar:

  • (i) the characteristics, efficiency and limitations of the radar equipment;

  • (ii) any constraints imposed by the radar range scale in use;

  • (iii) the effect on radar detection of the sea state, weather and other sources of interference;

  • (iv) the possibility that small vessels, ice and other floating objects may not be detected by radar at an adequate range;

  • (v) the number, location and movement of vessels detected by radar;

  • (vi) the more exact assessment of the visibility that may be possible when radar is used to determine the range of vessels or other objects in the vicinity.


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