Device for assisting the steering of an all terrain vehicle

The device has acquisition unit (2) connected to an all terrain vehicle (1) to carry out a partial acquisition limited to a ground plate (15) corresponding to a part (6) of field of view (4). The plate is limited on a side close to the vehicle by a close segment, on a distant side by a distant segment and laterally by two segments. The segments connect the ends of segments of the plate.