A speed parameter or channel quality parameter are determined in a mobile device based on variation in frequency offset measurement. The storage modules comprise storage cells arranged in a rule based structured configuration, and robotic hands to which move along tracks in order to retrieve objects from the storage cells. A first plurality of resistance devices are used, each associated with a respective one of the plurality of conductive segments. The novel drive apparatus includes an electrically powered linear drive mechanism for moving the first camera and an electrically powered motor and gear arrangement for rotating the second camera. The enclosure collapses to store in a narrow space, is lightweight, and can be used to transport the contained equipment either by a carry handle or as a backpack.