The validation in the report is based on results of standard manoeuvres, performed with fast-time simulations. These simulations have been extended with unsteady turning manoeuvres. Skippers often have to manoeuvre in confined areas. During an approach of a lock or the execution of a turning manoeuvre in a swinging area, the manoeuvring model is often used beyond quadrant I. Sailing ahead with a negative thrust (propeller that runs astern) or sailing astern with a positive thrust are quite common. Because of that it was decided to perform turning manoeuvres in unsteady conditions. Normally a turning manoeuvre is started at a self-propulsion point. Because the speeds are rather small while approaching a lock or executing a turning manoeuvre, small initial negative and positive speeds have been applied for the turning manoeuvres.