CFR > Title 33 - Navigation and Navigable Waters > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER E—INLAND NAVIGATION RULES (parts 83 to 90) > PART 83—RULES > SUBPART B—Steering and Sailing Rules (§83.04 to §83.19) > 83.06—Safe speed (Rule 6).

83.06—Safe speed (Rule 6).

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:
(1) The state of visibility;
(2) The traffic density including concentration of fishing vessels or any other vessels;
(3) The maneuverability of the vessel with special reference to stopping distance and turning ability in the prevailing conditions;
(4) At night the presence of background light such as from shores lights or from back scatter of her own lights;
(5) The state of wind, sea, and current, and the proximity of navigational hazards;
(6) The draft in relation to the available depth of water.
(b) Additionally, by vessels with operational radar:
(1) The characteristics, efficiency and limitations of the radar equipment;
(2) Any constraints imposed by the radar range scale in use;
(3) The effect on radar detection of the sea state, weather, and other sources of interference;
(4) The possibility that small vessels, ice and other floating objects may not be detected by radar at an adequate range;
(5) The number, location, and movement of vessels detected by radar; and
(6) 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.