1. A method of operating a portable terminal for recognizing a pedestrians step, the method comprising the acts of: acquiring, via an acquisition unit of the portable terminal operated by the pedestrian, a sequence of images of the pedestrian; detecting, in each image of the sequence of images, an object representing at least a part of a foot, a shoe, and/or a leg of the pedestrian; determining a position of the object in the respective image; recognizing a step of the pedestrian as a function of a position change of the object between at least two images of the sequence of images; and signaling to the pedestrian at least one of a current position and a determined route of the portable terminal based in part on the recognized step.