Does anyone have any information about the "90Mhz speaker GPS shoe" that he claims he invented and sold the rights to? Google can't find any reference to it out

Does anyone have any information about the "90Mhz speaker GPS shoe" that he claims he invented and sold the rights to? Google can't find any reference to it outside of similar anecdotes. It's a rather exceptional claim, based on the state of technology at the time that he would have had to have invented it. For example, how was it powered such that it was constantly transmitting on FM band and would work any old time that his dad wandered away? Also, what exactly is a "wired area network card"? Did his dad stumble around with a POE cat5 cable tethered to his shoe? Or did the BBC misquote what was supposed to be "wide area network"? Even then, it doesn't make much sense to me. I would love to believe that this person built such a device out of old radio and computer parts, but it just doesn't seem feasible.