Arrangement and method for manoeuvring a vessel (1) that is towing a load (10). The vessel has a block (4, 5) at the aft end, over which at least one tow line (6, 7) extends. The block (4, 5) is moveable transverse to the longitudinal axis or longitudinally of the vessel. The position of the moveable block (4, 5) defines a point of attack for a tension force from the tow line (6, 7). An autopilot (11) is coupled to an actuator (21) moving said block (4, 5), in order to change the moment of force about a rotation point of the vessel (1). The autopilot (11) has a calculation unit (12), which detects the tension force (W1, W2) and calculates the moment of force on the vessel (1). The autopilot can thus usea change in said moment of force to manoeuvre the vessel (1).
