Rule 6 Safe speed (b) Additionally by vessels with operational radar

The characteristics, efficiency and limitations of the radar equipment any constraints imposed by the radar range scale in use the effect on radar detection of the sea state,weather and other sources of interference the possibility that small vessels, ice and other floating objects may not be detected by radar at an adequate range the number, location and movement of vessels detected by radar 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