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
(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.