Have you ever watched the news? Of course you have. Well then, as an expert, you will know that at the end of the news, there tends to be a meteorologist flailing their hands about in front of a map of the UK. The reason for their flailing is that they have only a rough idea of where the various areas of the UK are in relation to there hands. You see the map is not there, it is added in by clever technology that replaces a green background with a desired image.