1. A method of shimming a magnetic field in a magnetic resonance tomography (MRT) device having a local coil, the method comprising: determining, by a controller of the MRT device, a field of view area; automatically adapting the field of view area to an area of an object under examination; determining, by the controller, a shim field map of the field of view area by using automatic positioning information and automatic coverage information including the area of the object under examination and a position of the local coil, wherein the MRT device is configured to use the area of the object under examination and the position of the local coil in order to determine a position, a size, or the position and the size of the field of view area; shimming the magnetic field of the field of view area with respect to the object under examination based on the determined shim field map; recording, by the MRT device, an image of the object under examination using the shimmed magnetic field; and displaying or storing the recorded image.