Delivery Trucks with GPS Trackers

My friend John works for, what he describes as, a new age delivery company. When I asked him what he means by new age, all he said was that they use the latest technology. He explained that they have installed GPS trackers in all of their delivery trucks. They can track where all of their trucks are at all times. They can use the internet to view where each truck is at any given moment. All they have to do is log on to a secure website and they see where you are and see where you have been.  At first this used to freak him out, but the technology has saved him a couple of times.