Perhaps there are many who do not know what the initial letters used as the heading of this article mean. They are used as a short way of describing the ‘Global Positioning System’. When this device was developed it caused the manner in which directions to desired destinations were found to be rethought. It was very useful on a vast range of journeys, both terrestrial and stellar. The ability to pinpoint a house while riding a bicycle, either in a very large housing estate or a remote rural dwelling, or to know exactly the location of a satellite hurtling through space, is quite amazing.
