Is Radar an absolute necessity?
I am just not seeing how rule 6 (below) requires the use of Radar if you have it. Rule 6 seems to require use of radar in such conditions where speed would be otherwise be limited without its use.
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 manageability 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 from her own lights;
(v) The state of wind, sea and current, and the proximity of navigational hazards;
(vi) The draft 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 constrains 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
(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.