A tethering system for a remote-controlled device includes a tether line having a first end adapted to be connected to a ground support and a second end adapted to be connected to the remote-controlled device. In a node there is maintained 206 a first, node-specific data structure comprising entries representing state information needed for handling sets of data packets handled in said node. In this manner, a flow can be routed along a route that provides less latency than other available routes. When deteriorated parts are found, only the circuit board with such parts mounted is removed for repair or replacement, resulting in improving productivity and reducing production cost. There is at least one display unit visibly arranged behind said durable and substantially transparent surface layer for presenting moving images.