Calculating the position parameters at the kinematic maneuver for approaching and collision courses

Collision risks take into consideration the CPA, the TCPA and the speed of maneuver. In specialty literature, starting distance for collision avoidance maneuver is 4-6 nautical miles, distance calculated for small speeds. The calculations and simulations for more collision situations for a container ship of 13000 TEU and speeds higher than 20-25 knots, the minimum distance for the collision avoidance maneuver should be at least 6 -8 nautical miles.