It feels like almost yesterday we were sitting in the passenger seat of our parents car, frantically using our pointer finger to follow along the big paper map book. However no longer are we amongst the days of searching through the index of street names. In fact, the Global Positioning System or better known as the GPS has been around now and officially operational for citizens for over 24 years. Today, it seems as though everyone has one and it is the best navigation network on offer, however the GPS that we know and love and heavily rely on is only one of numerous global navigation satellite systems in the sky right now. To tell us more about the GPS and other navigation systems, as well as the future of this system we were joined on the Daily by Professor Andrew Dempster Director for the Australian Centre for Space Engineering Research.