Rule 6. Safe speed (a) By all vessels

The state of visibility the traffic density including concentrations of fishing vessels or any other vessels the manoeuvrability of the vessel with special reference to stopping distance and turning ability in the prevailing conditions at night the presence of background light such as from shore lights or from back scatter of her own lights the state of wind, sea and current, and the proximity of navigational hazards the draught in relation to the available depth of water