Fig.4.12 and Fig.4.13 show the results for deviated maximum lateral distance from the original course with function of SP12/L1 for the case of overtaken and overtaking VLCC under the condition of U2/U1 = 1.2. In this case, the separation between two ships, SP12 was chosen to be 0.3 to 0.7 times of L1 and L2/L1 was taken as 1.0 in h/d=1.2. From these figures, an overtaking vessel with ranges of 5 degrees in maximum rudder angle can be manoeuvred safely without deviating from the original paths under the condition of SP12/L1 =0.3. In addition, the deviation for the case of overtaken vessel with ranges of 5 degrees in maximum rudder angle is not largely deviated from the original course regardless of wind direction, if lateral separation between two ships is about 0.6 L1.