Part (a): the state of visibility, the traffic density,  the manoeuvrability of the vessel , at night the presence of background light, the proximity of navigational hazards, the draught in relation to the available depth of water, Part (b): the characteristics, efficiency and limitations of the radar equipmen, any constraints imposed by the radar range scale in use, the effect on radar detection of the sea state, the possibility that small vessels, ice and other floating objects may not be detected by radar at an adequate range, the number, location and movements of vessels detected by radar, the more exact assessment of the visibility,

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