This work presents an evaluation study on the usability of a haptic device and a sound-based videogame for the development and use of orientation and mobility (O&M) skills in closed, unfamiliar spaces by blind, school-aged children. A usability evaluation was implemented for a haptic device especially designed for this project (Digital Clock Carpet) and a 3D videogame (MOVA3D), in order to redesign and improve the usability, as well as to learn of its acceptance and the degree of the user's satisfaction with the interaction with these products for O&M purposes. The results show that both the haptic device and the videogame are usable, accepted and pleasant regarding their use by blind children, and that they are ready to be used in the following stage, which will determine their impact on the development and use of O&M skills.