The satellite systems offer a variety of benefits for the user. Routes of travel can be planned, off road tracking is possible, as well as there are a large number of reference points within the system. This system also ties into the entertainment for the driver as well as communications.
A reference point is a point within the system that helps to provide you with information. If you had an actual map and could place a pin at a specific location, this is much the same with the satellite system. It is a navigational term to help you find your way from one place to another so to speak.