More than that, the dead reckoning data from the GPS "infected" numerous other automated systems that should have caught the error, because there was (is?) no d

More than that, the dead reckoning data from the GPS "infected" numerous other automated systems that should have caught the error, because there was (is?) no defined standard for what a GPS receiver should do in the event of losing its fix. In this case, it kept transmitting position data and added a proprietary "invalid" tag that wasn't parsed by other equipment.