Abstract
In the analytical process of manoeuvering chracteristics or numerical analyses of collision avoidance action, introduction of each bearings and distances of target into calculation formula makes so enomous combination of the situation that it becomes almost impossible to accomplish thorough and complete investigation. Authors, hence, contrived non-dimesional formulae as to distance and drew practical manoeuvering diagrams by the formulae. The characteristics of avoiding actions were also studied. Furthermore, the effect of mutual avoiding action, when two ships intend to manoeuvre according to these diagrams, were investigated and picked out desirable manoeuvering patterns of collision avoidance.
