Its quite easy, simply download various pocket queries, for example in my case, a 15 mile radius of my home town the then the next pocket query 15 or so miles away and so on.
As for the Link, many thanks, this bit I have figured out, how to import the icons (from the link), what I really need to know is the s/w used to create new icons.
As I have said I want to use the standard traditional cache icon and the edit it to change the colour so that I can use the traditional (green) for not found and say an icon with an orange top for caches found