| 摘要 |
<p>Systems and methods for marking a route, path or boundary. Signaling modules are positioned in an array to mark the route, path or boundary. The modules undergo radiofrequency communication with one another and emit signals in sequence from a first-positioned module of the array to a last-positioned module of the array. A selected one or more of the modules is/are programmed or adapted to emit a signal that is distinguishable from the signals emitted by the other modules.</p> |
