An animal farm system in a includes a barn, animal related structures within the barn, such as a feeding alley and/or a milking system, and an autonomous vehicle arranged to perform an animal related action and move about in the barn. The vehicle includes a control unit to move the vehicle about, a position determining system for determining a position of the vehicle in the barn, a sensor system to determine a value of a parameter related to a position of the vehicle with respect to the barn or an object therein, such as the at least one structure therein, and a vehicle communication device. The control unit further is arranged to contain barn map information, and receive motion control and navigation information via the vehicle communication device. The animal farm system further includes an external communication device to exchange information with the vehicle communication device, wherein the control unit is arranged to send determined vehicle positions and determined parameter values to the external communication device, that is arranged to visualise the received vehicle positions and determined parameter values in dependence of the momentary determined position of the vehicle, and for inputting by a user of barn map information on the basis of the visualised position and/or parameter values, and to send the inputted barn map information to the control unit. A corresponding method includes moving the vehicle, receiving vehicle positions and vehicle position dependent parameter values, and drawing a barn map based thereon.
