Either way, its a company truck and you really have no say in the matter. By the way your reacting, I would assume others would think you were not doing what your suppose to, regardless if you are or not. You had one person make a cute comment and you instantly got B-hurt. Yes, someone probably said something so that it got noticed that you did not have GPS, but if you go and confront that person and make it a big deal, that same person will go and run their mouth more and make the situation worse. Be professional and move on.