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 (S2) - Providing the master truck and all further trucks of the fleet with at least one visual marking on the trucks (S3) - Performing a calibration of the coordinate system of the master truck (S4) - 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 (S5) - 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 (S6), 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 (S7) ∘ 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 (S8) ∘ Comparing the determined actual spatial state of the truck with the master target state and/or the actual trajectory with the master trajectory (S9), and ∘ Calibrating the truck's coordinate system based on the result of this comparison (S10). - Defining a master truck from the fleet (S2) - Providing the master truck and all further trucks of the fleet with at least one visual marking on the trucks (S3) - Performing a calibration of the coordinate system of the master truck (S4) - 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 (S5) - 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 (S6), 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 (S7) ∘ 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 (S8) ∘ Comparing the determined actual spatial state of the truck with the master target state and/or the actual trajectory with the master trajectory (S9), and ∘ Calibrating the truck's coordinate system based on the result of this comparison (S10). ∘ 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 (S7) ∘ 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 (S8) ∘ Comparing the determined actual spatial state of the truck with the master target state and/or the actual trajectory with the master trajectory (S9), and ∘ Calibrating the truck's coordinate system based on the result of this comparison (S10). <EOS>