A self-propelled milling machine (1a, 1b), in particular a road milling machine or surface miner or recycler, for milling a ground surface, - comprising a machine frame with a longitudinal central axis, extending longitudinally as seen in the direction of travel, - comprising a controller for the travelling and milling operation, - comprising a height-adjustable milling drum, - comprising a slewable transport conveyor with a longitudinal central axis, arranged in front of or behind the milling drum as seen in the direction of travel of the milling machine (1a, 1b), which unloads the milling material worked off by the milling drum onto a point of impingement on a loading surface of a means of transport, - wherein the loading surface features a longitudinal central axis, - wherein the transport conveyor revolving continuously at a preset conveying speed is slewable, relative to the machine frame, about a first axis extending parallel and transverse to the machine frame under an elevation angle, and laterally about a second, essentially vertical axis extending orthogonally to the first axis under a slewing angle, - wherein the controller comprises a control system, which - continuously locates the alterable position of the loading surface of the means of transport and of the slewable transport conveyor relative to the machine frame, or - the alterable position of the loading surface relative to the transport conveyor, and continuously controls at least one of the following control parameters, namely, the slewing angle, the elevation angle and the conveying speed of the transport conveyor, automatically in such a fashion that the discharged milling material impinges on a precalculated point of impingement within the loading surface, characterized in that the control system determines correction factors for the at least one control parameter as a function of at least one of the following parameters describing the alterable position of the loading surface, namely, the transverse inclination about the longitudinal central axis of the loading surface, a position angle (46, 47) between the longitudinal central axis of the loading surface and the longitudinal central axis of the transport conveyor or the longitudinal central axis of the machine frame, and the position of the precalculated point of impingement relative to an end (50, 51) of the loading surface lying on the longitudinal central axis. - comprising a machine frame with a longitudinal central axis, extending longitudinally as seen in the direction of travel, - comprising a controller for the travelling and milling operation, - comprising a height-adjustable milling drum, - comprising a slewable transport conveyor with a longitudinal central axis, arranged in front of or behind the milling drum as seen in the direction of travel of the milling machine (1a, 1b), which unloads the milling material worked off by the milling drum onto a point of impingement on a loading surface of a means of transport, - wherein the loading surface features a longitudinal central axis, - wherein the transport conveyor revolving continuously at a preset conveying speed is slewable, relative to the machine frame, about a first axis extending parallel and transverse to the machine frame under an elevation angle, and laterally about a second, essentially vertical axis extending orthogonally to the first axis under a slewing angle, - wherein the controller comprises a control system, which - continuously locates the alterable position of the loading surface of the means of transport and of the slewable transport conveyor relative to the machine frame, or - the alterable position of the loading surface relative to the transport conveyor, and continuously controls at least one of the following control parameters, namely, the slewing angle, the elevation angle and the conveying speed of the transport conveyor, automatically in such a fashion that the discharged milling material impinges on a precalculated point of impingement within the loading surface,