Method for calibrating a respective coordinate system of a fleet of automated industrial trucks with uncalibrated coordinate systems, comprising the following steps: - Defining a master truck from the fleet - Providing the master truck and all further trucks of the fleet with at least one visual marking on the trucks - Performing a calibration of the coordinate system of the master truck - Having the calibrated master truck run through a predetermined sequence of movements in order to reach a calibrated spatial target state via a calibrated trajectory - Capturing the at least one visual marking on the master truck by means of an optical camera remote from the master truck in order to determine a master trajectory and/or a master target state, and - for each further truck of the fleet: ∘ Running through a predetermined sequence of movements based on the corresponding uncalibrated coordinate system in order to replicate the master trajectory and/or reach the master target state ∘ Capturing the at least one visual marking on the further truck by means of an optical camera in order to determine the actual trajectory and/or the actual spatial state of the truck ∘ Comparing the determined actual spatial state of the truck with the master target state and/or the actual trajectory with the master trajectory, and ∘ Calibrating the truck's coordinate system based on the result of this comparison. - Defining a master truck from the fleet - Providing the master truck and all further trucks of the fleet with at least one visual marking on the trucks - Performing a calibration of the coordinate system of the master truck - Having the calibrated master truck run through a predetermined sequence of movements in order to reach a calibrated spatial target state via a calibrated trajectory - Capturing the at least one visual marking on the master truck by means of an optical camera remote from the master truck in order to determine a master trajectory and/or a master target state, and - for each further truck of the fleet: ∘ Running through a predetermined sequence of movements based on the corresponding uncalibrated coordinate system in order to replicate the master trajectory and/or reach the master target state ∘ Capturing the at least one visual marking on the further truck by means of an optical camera in order to determine the actual trajectory and/or the actual spatial state of the truck ∘ Comparing the determined actual spatial state of the truck with the master target state and/or the actual trajectory with the master trajectory, and ∘ Calibrating the truck's coordinate system based on the result of this comparison. ∘ Running through a predetermined sequence of movements based on the corresponding uncalibrated coordinate system in order to replicate the master trajectory and/or reach the master target state ∘ Capturing the at least one visual marking on the further truck by means of an optical camera in order to determine the actual trajectory and/or the actual spatial state of the truck ∘ Comparing the determined actual spatial state of the truck with the master target state and/or the actual trajectory with the master trajectory, and ∘ Calibrating the truck's coordinate system based on the result of this comparison.